@@ -1,334 +1,903 @@
1+{-# LANGUAGE DataKinds #-}
2+{-# LANGUAGE LambdaCase #-}
3+{-# LANGUAGE OverloadedStrings #-}
4+{-# LANGUAGE QuasiQuotes #-}
5+{-# LANGUAGE RecordWildCards #-}
6+{-# LANGUAGE RoleAnnotations #-}
7+{-# LANGUAGE TemplateHaskellQuotes #-}
8+{-# LANGUAGE TypeFamilies #-}
9+{-# LANGUAGE UndecidableInstances #-}
2-- Module : Network.HTTP.Req
12-- Module : Network.HTTP.Req
3−-- Copyright : © 2016 Mark Karpov
13+-- Copyright : © 2016–present Mark Karpov
4-- License : BSD 3 clause
14-- License : BSD 3 clause
6−-- Maintainer : Mark Karpov <markkarpov@openmailbox.org>
16+-- Maintainer : Mark Karpov <markkarpov92@gmail.com>
7-- Stability : experimental
17-- Stability : experimental
8-- Portability : portable
18-- Portability : portable
10−-- This is an easy-to-use, type-safe, expandable, high-level HTTP library
20+-- The documentation below is structured in such a way that the most
11−-- that just works without any fooling around.
21+-- important information is presented first: you learn how to do HTTP
12−--
22+-- requests, how to embed them in the monad you have, and then it gives you
13−-- /(A modest intro goes here, click on 'req' to start making requests.)/
23+-- details about less-common things you may want to know about. The
24+-- documentation is written with sufficient coverage of details and
25+-- examples, and it's designed to be a complete tutorial on its own.
27+-- === About the library
29+-- Req is an HTTP client library that attempts to be easy-to-use, type-safe,
15−-- What does the “easy-to-use” phrase mean? It means that the library is
32+-- “Easy-to-use” means that the library is designed to be beginner-friendly
16−-- designed to be beginner-friendly, so it's simple to add it to your monad
33+-- so it's simple to add to your monad stack, intuitive to work with,
17−-- stack, intuitive to work with, well-documented, and does not get in your
34+-- well-documented, and does not get in your way. Doing HTTP requests is a
35+-- common task and a Haskell library for this should be approachable and
18−-- way. On this path certain compromises were made. For example one cannot
36+-- clear to beginners, thus certain compromises were made. For example, one
19−-- currently modify 'L.ManagerSettings' of default manager because the
37+-- cannot currently modify 'L.ManagerSettings' of the default manager
20−-- library always use the same implicit global manager for simplicity and
38+-- because the library always uses the same implicit global manager for
21−-- maximal connection sharing. There is a way to use your own manager with
39+-- simplicity and maximal connection sharing. There is a way to use your own
22−-- different settings, but it requires a bit more typing. Doing HTTP
40+-- manager with different settings, but it requires more typing.
23−-- requests is a common task and Haskell library for this should be very
24−-- approachable and clear to beginners.
26−-- “Type-safe” means that the library is protective and eliminates certain
42+-- “Type-safe” means that the library tries to eliminate certain classes of
27−-- class of errors compared to alternative libraries like @wreq@ or vanilla
28−-- @http-client@. For example we have correct-by-construction 'Url's, it's
43+-- errors. For example, we have correct-by-construction URLs; it is
29−-- guaranteed that user does not send request body when using methods like
44+-- guaranteed that the user does not send the request body when using
30−-- 'GET' or 'DELETE', amount of implicit assumptions is minimized by making
45+-- methods like GET or OPTIONS, and the amount of implicit assumptions is
31−-- user specify his\/her intentions in explicit form (for example it's not
46+-- minimized by making the user specify their intentions in an explicit
32−-- possible to avoid specifying body or method of a request). The library
47+-- form. For example, it's not possible to avoid specifying the body or the
33−-- carefully hides underlying types from lower-level @http-client@ package
48+-- method of a request. Authentication methods that assume HTTPS force the
34−-- because it's not type safe enough (for example 'L.Request' is an instance
49+-- user to use HTTPS at the type level.
35−-- of 'Data.String.IsString' and if it's malformed, it will blow up at
38−-- “Expandable” refers to the ability of the library to be expanded without
51+-- “Expandable” refers to the ability to create new components without
39−-- ugly hacking. For example it's possible to define your own HTTP methods,
52+-- having to resort to hacking. For example, it's possible to define your
40−-- new ways to construct body of request, new authorization options, new
53+-- own HTTP methods, create new ways to construct the body of a request,
41−-- ways to actually perform request and how to represent\/parse its
54+-- create new authorization options, perform a request in a different way,
42−-- response. As user extends the library to satisfy his\/her special needs,
55+-- and create your own methods to parse a response.
43−-- the new solutions work just like built-ins. That said, all common cases
56+--
44−-- are covered by the library out-of-the-box.
57+-- === Using with other libraries
46−-- “High-level” means that there are less details to worry about. The
59+-- * You won't need the low-level interface of @http-client@ most of the
47−-- library is a result of my experiences as a Haskell consultant, working
60+-- time, but when you do, it's better to do a qualified import,
48−-- for several clients who have very different projects and so the library
61+-- because @http-client@ has naming conflicts with @req@.
49−-- adapts easily to any particular style of writing Haskell applications.
62+-- * For streaming of large request bodies see the companion package
50−-- For example some people prefer throwing exceptions, while others are
63+-- @req-conduit@: <https://hackage.haskell.org/package/req-conduit>.
51−-- concerned with purity: just define 'handleHttpException' accordingly when
64+--
52−-- making your monad instance of 'MonadHttp' and it will play seamlessly.
65+-- === Lightweight, no risk solution
53−-- Finally, the library cuts boilerplate considerably and helps write
54−-- concise, easy to read code, thanks to its minimal and uniform API.
56−-- The documentation below is structured in such a way that most important
57−-- information goes first: you learn how to do HTTP requests, then how to
58−-- embed them in any monad you have, then it goes on giving you details
59−-- about less-common things you may want to know about. The documentation is
60−-- written with sufficient coverage of details and examples, it's designed
61−-- to be a complete tutorial on its own.
63−-- The library uses the following well-known and mature packages under the
67+-- The library uses the following mature packages under the hood to
64−-- hood to guarantee you best experience without bugs or other funny
68+-- guarantee you the best experience:
67−-- * <https://hackage.haskell.org/package/http-client> — low level HTTP
70+-- * <https://hackage.haskell.org/package/http-client>—low level HTTP
68-- client used everywhere in Haskell.
71-- client used everywhere in Haskell.
69−-- * <https://hackage.haskell.org/package/http-client-tls> — TLS (HTTPS)
72+-- * <https://hackage.haskell.org/package/http-client-tls>—TLS (HTTPS)
70-- support for @http-client@.
73-- support for @http-client@.
71−-- * <https://hackage.haskell.org/package/http-conduit> — conduit
74+--
72−-- interface to @http-client@.
75+-- It's important to note that since we leverage well-known libraries that
73−--
76+-- the whole Haskell ecosystem uses, there is no risk in using @req@. The
74−-- You won't need low-level interface of @http-client@ most of the time, but
77+-- machinery for performing requests is the same as with @http-conduit@ and
75−-- when you do, it's better import it qualified because it has naming
78+-- @wreq@. The only difference is the API.
76−-- conflicts with @req@.
78−{-# LANGUAGE DataKinds #-}
79−{-# LANGUAGE DeriveDataTypeable #-}
80−{-# LANGUAGE DeriveGeneric #-}
81−{-# LANGUAGE FlexibleInstances #-}
82−{-# LANGUAGE GeneralizedNewtypeDeriving #-}
83−{-# LANGUAGE KindSignatures #-}
84−{-# LANGUAGE OverloadedStrings #-}
85−{-# LANGUAGE RecordWildCards #-}
86−{-# LANGUAGE ScopedTypeVariables #-}
87−{-# LANGUAGE TypeFamilies #-}
88−{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
90module Network.HTTP.Req
79module Network.HTTP.Req
91 ( -- * Making a request
80 ( -- * Making a request
92 -- $making-a-request
81 -- $making-a-request
94− -- * Embedding requests into your monad
88+ -- * Embedding requests in your monad
95 -- $embedding-requests
89 -- $embedding-requests
96− , MonadHttp (..)
90+ MonadHttp (..),
97− , HttpConfig (..)
91+ HttpConfig (..),
98 -- * Request
96 -- * Request
100− -- $request-methods
98+ -- ** Method
101− , GET (..)
100+ GET (..),
102− , POST (..)
101+ POST (..),
103− , HEAD (..)
102+ HEAD (..),
104− , PUT (..)
103+ PUT (..),
105− , DELETE (..)
104+ DELETE (..),
106− , TRACE (..)
105+ TRACE (..),
107− , CONNECT (..)
106+ CONNECT (..),
108− , OPTIONS (..)
107+ OPTIONS (..),
109− , PATCH (..)
108+ PATCH (..),
110− , HttpMethod (..)
109+ HttpMethod (..),
111 -- ** URL
111 -- ** URL
116− , parseUrlHttp
118+ useHttpURI,
117− , parseUrlHttps
119+ useHttpsURI,
118 -- ** Body
124 -- ** Body
119− , HttpBody (..) -- TODO more stuff here
125+ -- $body
132+ FormUrlEncodedParam,
120 -- ** Optional parameters
139 -- ** Optional parameters
121− -- $request-optional-parameters
140+ -- $optional-parameters
122− , Option
141+ Option,
123 -- *** Query parameters
143 -- *** Query parameters
144+ -- $query-parameters
125− , queryFlag
146+ queryFlag,
126− , QueryParam (..)
148+ QueryParam (..),
127 -- *** Headers
150 -- *** Headers
128− , header
151+ header,
129 -- *** Cookies
155 -- *** Cookies
130 -- *** Authentication
159 -- *** Authentication
131− -- $request-optional-parameters-authentication
160+ -- $authentication
132− , basicAuth
161+ basicAuth,
133− , oAuth1
164+ oAuth1,
134− , oAuth2Bearer
165+ oAuth2Bearer,
135− , oAuth2Token
166+ oAuth2Token,
136− , awsAuth
167+ customAuth,
137 -- *** Other
169 -- *** Other
139− , decompress
171+ decompress,
140− , responseTimeout
172+ responseTimeout,
141− , httpVersion
173+ httpVersion,
142 -- * Response
175 -- * Response
177+ -- ** Response interpretations
187+ -- ** Inspecting a response
190+ responseStatusMessage,
194+ -- ** Defining your own interpretation
195+ -- $new-response-interpretation
143− , HttpResponse (..)
196+ HttpResponse (..),
144 -- * Other
198 -- * Other
200+ isStatusCodeException,
145− , CanHaveBody (..)
201+ CanHaveBody (..),
146− , Scheme (..) )
202+ Scheme (..),
206+import Blaze.ByteString.Builder qualified as BB
149−import Control.Applicative ((<|>))
207+import Control.Applicative
150import Control.Arrow (first, second)
208import Control.Arrow (first, second)
151−import Control.Exception (try)
209+import Control.Exception hiding (Handler (..), TypeError)
210+import Control.Monad (guard, void, (>=>))
152−import Control.Monad
211+import Control.Monad.Base
212+import Control.Monad.Catch (Handler (..), MonadCatch, MonadMask, MonadThrow)
153import Control.Monad.IO.Class
213import Control.Monad.IO.Class
214+import Control.Monad.IO.Unlift
215+import Control.Monad.Reader (ReaderT (ReaderT), ask, lift, runReaderT)
216+import Control.Monad.Trans.Accum (AccumT)
217+import Control.Monad.Trans.Cont (ContT)
218+import Control.Monad.Trans.Control
219+import Control.Monad.Trans.Except (ExceptT)
220+import Control.Monad.Trans.Identity (IdentityT)
221+import Control.Monad.Trans.Maybe (MaybeT)
222+import Control.Monad.Trans.RWS.CPS qualified as RWS.CPS
223+import Control.Monad.Trans.RWS.Lazy qualified as RWS.Lazy
224+import Control.Monad.Trans.RWS.Strict qualified as RWS.Strict
225+import Control.Monad.Trans.Select (SelectT)
226+import Control.Monad.Trans.State.Lazy qualified as State.Lazy
227+import Control.Monad.Trans.State.Strict qualified as State.Strict
228+import Control.Monad.Trans.Writer.CPS qualified as Writer.CPS
229+import Control.Monad.Trans.Writer.Lazy qualified as Writer.Lazy
230+import Control.Monad.Trans.Writer.Strict qualified as Writer.Strict
232+import Data.Aeson (FromJSON (..), ToJSON (..))
154−import Data.Aeson
233+import Data.Aeson qualified as A
155import Data.ByteString (ByteString)
234import Data.ByteString (ByteString)
235+import Data.ByteString qualified as B
236+import Data.ByteString.Lazy qualified as BL
237+import Data.CaseInsensitive qualified as CI
156import Data.Data (Data)
238import Data.Data (Data)
157−import Data.Default.Class
239+import Data.Default.Class (def)
240+import Data.Function (on)
158import Data.IORef
241import Data.IORef
242+import Data.Kind (Constraint, Type)
243+import Data.List (foldl', nubBy)
159import Data.List.NonEmpty (NonEmpty (..))
244import Data.List.NonEmpty (NonEmpty (..))
245+import Data.List.NonEmpty qualified as NE
246+import Data.Maybe (fromMaybe)
160import Data.Proxy
247import Data.Proxy
161−import Data.Semigroup hiding (Option, option)
248+import Data.Semigroup (Endo (..))
249+import Data.Set qualified as S
162import Data.Text (Text)
250import Data.Text (Text)
251+import Data.Text qualified as T
252+import Data.Text.Encoding qualified as T
163−import Data.Typeable (Typeable)
253+import Data.Typeable (Typeable, cast)
164import GHC.Generics
254import GHC.Generics
165import GHC.TypeLits
255import GHC.TypeLits
256+import Language.Haskell.TH qualified as TH
257+import Language.Haskell.TH.Quote qualified as TH
258+import Language.Haskell.TH.Syntax qualified as TH
259+import Network.Connection qualified as NC
260+import Network.HTTP.Client qualified as L
261+import Network.HTTP.Client.Internal qualified as LI
262+import Network.HTTP.Client.MultipartFormData qualified as LM
263+import Network.HTTP.Client.TLS qualified as L
264+import Network.HTTP.Types qualified as Y
166import System.IO.Unsafe (unsafePerformIO)
265import System.IO.Unsafe (unsafePerformIO)
167−import qualified Data.Binary.Builder as R
266+import Text.URI (URI)
168−import qualified Data.ByteString as B
267+import Text.URI qualified as URI
169−import qualified Data.ByteString.Lazy as BL
268+import Text.URI.QQ qualified as QQ
170−import qualified Data.CaseInsensitive as CI
269+import Web.Authenticate.OAuth qualified as OAuth
171−import qualified Data.List.NonEmpty as NE
270+import Web.FormUrlEncoded (FromForm (..), ToForm (..))
172−import qualified Data.Text.Encoding as T
271+import Web.FormUrlEncoded qualified as Form
173−import qualified Network.Connection as NC
272+import Web.HttpApiData (ToHttpApiData (..))
174−import qualified Network.HTTP.Client as L
175−import qualified Network.HTTP.Client.Internal as LI
176−import qualified Network.HTTP.Client.TLS as L
177−import qualified Network.HTTP.Req.AWS as AWS
178−import qualified Network.HTTP.Req.OAuth1 as OAuth1
179−import qualified Network.HTTP.Types as Y
181----------------------------------------------------------------------------
274----------------------------------------------------------------------------
182-- Making a request
275-- Making a request
184-- $making-a-request
277-- $making-a-request
186−-- To make an HTTP request you need only one function: 'req'.
279+-- To make an HTTP request you normally need only one function: 'req'.
188−-- | Make an HTTP request.
281+-- | Make an HTTP request. The function takes 5 arguments, 4 of which
189−--
282+-- specify required parameters and the final 'Option' argument is a
190−-- TODO Finish docs of this function when the package is more developed.
193− :: forall m method body response scheme.
197− , HttpResponse response
198− , AllowsBody method ~ ProvidesBody body )
199− => method -- ^ HTTP method
200− -> Url scheme -- ^ 'Url' — location of resource
201− -> body -- ^ Body of the request
202− -> Option scheme -- ^ Collection of optional parameters
283+-- collection of optional parameters.
203− -> m response -- ^ Response
284+--
204−req method url body options = do
285+-- Let's go through all the arguments first: @req method url body response
205− config <- getHttpConfig
286+-- options@.
206− manager <- liftIO (readIORef globalManager)
287+--
207− let request = flip appEndo L.defaultRequest $
288+-- @method@ is an HTTP method such as 'GET' or 'POST'. The documentation has
208− -- NOTE Order of 'mappend's matters, here method is overwritten
289+-- a dedicated section about HTTP methods below.
209− -- first and 'config' takes its effect last. In particular, this
290+--
210− -- means that 'options' can overwrite things set by 'url' and
291+-- @url@ is a 'Url' that describes location of resource you want to interact
211− -- 'body', which is useful for setting port number, "Content-Type"
292+-- with.
212− -- header, etc.
293+--
213− getRequestMod config <>
294+-- @body@ is a body option such as 'NoReqBody' or 'ReqBodyJson'. The
214− getRequestMod options <>
295+-- tutorial has a section about HTTP bodies, but usage is very
215− getRequestMod (Womb body :: Womb "body" body) <>
296+-- straightforward and should be clear from the examples.
216− getRequestMod url <>
297+--
217− getRequestMod (Womb method :: Womb "method" method)
298+-- @response@ is a type hint how to make and interpret response of an HTTP
299+-- request. Out-of-the-box it can be the following:
301+-- * 'ignoreResponse'
303+-- * 'bsResponse' (to get a strict 'ByteString')
304+-- * 'lbsResponse' (to get a lazy 'BL.ByteString')
306+-- Finally, @options@ is a 'Monoid' that holds a composite 'Option' for all
307+-- other optional settings like query parameters, headers, non-standard port
308+-- number, etc. There are quite a few things you can put there, see the
309+-- corresponding section in the documentation. If you don't need anything at
310+-- all, pass 'mempty'.
312+-- __Note__ that if you use 'req' to do all your requests, connection
313+-- sharing and reuse is done for you automatically.
315+-- See the examples below to get on the speed quickly.
319+-- First, this is a piece of boilerplate that should be in place before you
322+-- > {-# LANGUAGE DeriveGeneric #-}
323+-- > {-# LANGUAGE OverloadedStrings #-}
325+-- > module Main (main) where
327+-- > import Control.Monad
328+-- > import Control.Monad.IO.Class
329+-- > import Data.Aeson
330+-- > import Data.Maybe (fromJust)
331+-- > import Data.Monoid ((<>))
332+-- > import Data.Text (Text)
333+-- > import GHC.Generics
334+-- > import Network.HTTP.Req
335+-- > import qualified Data.ByteString.Char8 as B
336+-- > import qualified Text.URI as URI
338+-- We will be making requests against the <https://httpbin.org> service.
340+-- Make a GET request, grab 5 random bytes:
343+-- > main = runReq defaultHttpConfig $ do
346+-- > bs <- req GET (https "httpbin.org" /: "bytes" /~ n) NoReqBody bsResponse mempty
347+-- > liftIO $ B.putStrLn (responseBody bs)
349+-- The same, but now we use a query parameter named @\"seed\"@ to control
350+-- seed of the generator:
353+-- > main = runReq defaultHttpConfig $ do
354+-- > let n, seed :: Int
357+-- > bs <- req GET (https "httpbin.org" /: "bytes" /~ n) NoReqBody bsResponse $
359+-- > liftIO $ B.putStrLn (responseBody bs)
361+-- POST JSON data and get some info about the POST request:
363+-- > data MyData = MyData
366+-- > } deriving (Show, Generic)
368+-- > instance ToJSON MyData
369+-- > instance FromJSON MyData
372+-- > main = runReq defaultHttpConfig $ do
373+-- > let myData = MyData
375+-- > , color = "Green" }
376+-- > v <- req POST (https "httpbin.org" /: "post") (ReqBodyJson myData) jsonResponse mempty
377+-- > liftIO $ print (responseBody v :: Value)
379+-- Sending URL-encoded body:
382+-- > main = runReq defaultHttpConfig $ do
384+-- > "foo" =: ("bar" :: Text) <>
386+-- > response <- req POST (https "httpbin.org" /: "post") (ReqBodyUrlEnc params) jsonResponse mempty
387+-- > liftIO $ print (responseBody response :: Value)
389+-- Using various optional parameters and URL that is not known in advance:
392+-- > main = runReq defaultHttpConfig $ do
393+-- > -- This is an example of what to do when URL is given dynamically. Of
394+-- > -- course in a real application you may not want to use 'fromJust'.
395+-- > uri <- URI.mkURI "https://httpbin.org/get?foo=bar"
396+-- > let (url, options) = fromJust (useHttpsURI uri)
397+-- > response <- req GET url NoReqBody jsonResponse $
398+-- > "from" =: (15 :: Int) <>
399+-- > "to" =: (67 :: Int) <>
400+-- > basicAuth "username" "password" <>
401+-- > options <> -- contains the ?foo=bar part
402+-- > port 443 -- here you can put any port of course
403+-- > liftIO $ print (responseBody response :: Value)
408+ HttpResponse response,
409+ HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
413+ -- | 'Url'—location of resource
415+ -- | Body of the request
417+ -- | A hint how to interpret response
419+ -- | Collection of optional parameters
423+req method url body responseProxy options =
424+ reqCb method url body responseProxy options pure
426+-- | A version of 'req' that does not use one of the predefined instances of
427+-- 'HttpResponse' but instead allows the user to consume @'L.Response'
428+-- 'L.BodyReader'@ manually, in a custom way.
435+ HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
439+ -- | 'Url'—location of resource
441+ -- | Body of the request
443+ -- | Collection of optional parameters
445+ -- | How to consume response
446+ (L.Response L.BodyReader -> IO a) ->
449+reqBr method url body options consume =
450+ req' method url body options (reqHandler consume)
452+-- | A version of 'req' that takes a callback to modify the 'L.Request', but
453+-- otherwise performs the request identically.
460+ HttpResponse response,
461+ HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
465+ -- | 'Url'—location of resource
467+ -- | Body of the request
469+ -- | A hint how to interpret response
471+ -- | Collection of optional parameters
473+ -- | Callback to modify the request
474+ (L.Request -> m L.Request) ->
477+reqCb method url body responseProxy options adjustRequest =
478+ req' method url body (options <> extraOptions) $ \request manager -> do
479+ request' <- adjustRequest request
218− liftIO (try $ getHttpResponse manager request)
480+ reqHandler getHttpResponse request' manager
483+ case acceptHeader responseProxy of
485+ Just accept -> header "Accept" accept
487+-- | The default handler function that the higher-level request functions
488+-- pass to 'req''. Internal function.
493+ -- | How to get final result from a 'L.Response'
494+ (L.Response L.BodyReader -> IO b) ->
495+ -- | 'L.Request' to perform
497+ -- | 'L.Manager' to use
500+reqHandler consume request manager = do
501+ HttpConfig {..} <- getHttpConfig
502+ let wrapVanilla = handle (throwIO . VanillaHttpException)
503+ wrapExc = handle (throwIO . LI.toHttpException request)
507+ (readIORef >=> mapM_ L.responseClose)
508+ (liftIO . try . wrapVanilla . wrapExc)
509+ ( withRRef $ \rref -> do
510+ let openResponse = mask_ $ do
512+ mapM_ L.responseClose r
513+ r' <- L.responseOpen request manager
514+ writeIORef rref (Just r')
516+ exceptionRetryPolicies =
518+ ++ [ \retryStatus -> Handler $ \e ->
519+ return $ httpConfigRetryJudgeException retryStatus e
523+ httpConfigRetryPolicy
524+ (\retryStatus r -> return $ httpConfigRetryJudge retryStatus r)
527+ httpConfigRetryPolicy
528+ exceptionRetryPolicies
529+ (const openResponse)
532+ (preview, r') <- grabPreview httpConfigBodyPreviewLength r
533+ mapM_ LI.throwHttp (httpConfigCheckResponse request r' preview)
219 >>= either handleHttpException return
536 >>= either handleHttpException return
538+-- | Mostly like 'req' with respect to its arguments, but accepts a callback
539+-- that allows to perform a request in arbitrary fashion.
541+-- This function /does not/ perform handling\/wrapping exceptions, checking
542+-- response (with 'httpConfigCheckResponse'), and retrying. It only prepares
543+-- 'L.Request' and allows you to use it.
547+ forall m method body scheme a.
551+ HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
555+ -- | 'Url'—location of resource
557+ -- | Body of the request
559+ -- | Collection of optional parameters
561+ -- | How to perform request
562+ (L.Request -> L.Manager -> m a) ->
565+req' method url body options m = do
566+ config <- getHttpConfig
567+ let -- NOTE First appearance of any given header wins. This allows to
568+ -- “overwrite” headers when we construct a request by cons-ing.
569+ nubHeaders = Endo $ \x ->
570+ x {L.requestHeaders = nubBy ((==) `on` fst) (L.requestHeaders x)}
572+ flip appEndo L.defaultRequest $
573+ -- NOTE The order of 'mappend's matters, here method is overwritten
574+ -- first and 'options' take effect last. In particular, this means
575+ -- that 'options' can overwrite things set by other request
576+ -- components, which is useful for setting port number,
577+ -- "Content-Type" header, etc.
579+ <> getRequestMod options
580+ <> getRequestMod config
581+ <> getRequestMod (Tagged body :: Tagged "body" body)
582+ <> getRequestMod url
583+ <> getRequestMod (Tagged method :: Tagged "method" method)
584+ request <- finalizeRequest options request'
585+ withReqManager (m request)
587+-- | Perform an action using the global implicit 'L.Manager' that the rest
588+-- of the library uses. This allows us to reuse connections that the
589+-- 'L.Manager' controls.
590+withReqManager :: (MonadIO m) => (L.Manager -> m a) -> m a
591+withReqManager m = m globalManager
221−-- | Global 'L.Manager' that 'req' uses. Here we just go with the default
593+-- | The global 'L.Manager' that 'req' uses. Here we just go with the
222−-- settings, so users don't need to deal with this manager stuff at all, but
594+-- default settings, so users don't need to deal with this manager stuff at
223−-- when we create a request, instance 'HttpConfig' can affect the default
595+-- all, but when we create a request, instance 'HttpConfig' can affect the
224−-- settings via 'getHttpConfig'.
596+-- default settings via 'getHttpConfig'.
226-- A note about safety, in case 'unsafePerformIO' looks suspicious to you.
598-- A note about safety, in case 'unsafePerformIO' looks suspicious to you.
227-- The value of 'globalManager' is named and lives on top level. This means
599-- The value of 'globalManager' is named and lives on top level. This means
228−-- it will be shared, i.e. computed only once on first use of manager. From
600+-- it will be shared, i.e. computed only once on the first use of the
229−-- that moment on the 'IORef' will be just reused — exactly the behaviour we
601+-- manager. From that moment on the 'IORef' will be just reused—exactly the
230−-- want here in order to maximize connection sharing. GHC could spoil the
602+-- behavior we want here in order to maximize connection sharing. GHC could
231−-- plan by inlining the definition, hence the @NOINLINE@ pragma.
603+-- spoil the plan by inlining the definition, hence the @NOINLINE@ pragma.
233−globalManager :: IORef L.Manager
604+globalManager :: L.Manager
234globalManager = unsafePerformIO $ do
605globalManager = unsafePerformIO $ do
235 context <- NC.initConnectionContext
606 context <- NC.initConnectionContext
236− let settings = L.mkManagerSettingsContext (Just context) def Nothing
608+ L.mkManagerSettingsContext
237 manager <- L.newManager settings
612 manager <- L.newManager settings
238− newIORef manager
613+ return manager
239{-# NOINLINE globalManager #-}
614{-# NOINLINE globalManager #-}
241----------------------------------------------------------------------------
616----------------------------------------------------------------------------
242−-- Embedding requests into your monad
617+-- Embedding requests in your monad
244-- $embedding-requests
619-- $embedding-requests
246-- To use 'req' in your monad, all you need to do is to make the monad an
621-- To use 'req' in your monad, all you need to do is to make the monad an
247−-- instance of the 'MonadHttp' type class, which see.
622+-- instance of the 'MonadHttp' type class.
624+-- When writing a library, keep your API polymorphic in terms of
625+-- 'MonadHttp', only define instance of 'MonadHttp' in final application.
626+-- Another option is to use a @newtype@-wrapped monad stack and define
627+-- 'MonadHttp' for it. As of the version /0.4.0/, the 'Req' monad that
628+-- follows this strategy is provided out-of-the-box (see below).
249-- | A type class for monads that support performing HTTP requests.
630-- | A type class for monads that support performing HTTP requests.
250-- Typically, you only need to define the 'handleHttpException' method
631-- Typically, you only need to define the 'handleHttpException' method
251-- unless you want to tweak 'HttpConfig'.
632-- unless you want to tweak 'HttpConfig'.
253−class MonadIO m => MonadHttp m where
633+class (MonadIO m) => MonadHttp m where
255− {-# MINIMAL handleHttpException #-}
257− -- | This method describes how to deal with 'L.HttpException' that was
634+ -- | This method describes how to deal with 'HttpException' that was
258 -- caught by the library. One option is to re-throw it if you are OK with
635 -- caught by the library. One option is to re-throw it if you are OK with
259 -- exceptions, but if you prefer working with something like
636 -- exceptions, but if you prefer working with something like
260− -- 'Control.Monad.Error.MonadError', this is the right place to pass it to
637+ -- 'Control.Monad.Except.MonadError', this is the right place to pass it to
261− -- 'Control.Monad.Error.throwError' for example.
638+ -- 'Control.Monad.Except.throwError'.
263− handleHttpException :: L.HttpException -> m a
639+ handleHttpException :: HttpException -> m a
265− -- | Return 'HttpConfig' to be used when performing HTTP requests. Default
641+ -- | Return the 'HttpConfig' to be used when performing HTTP requests.
266− -- implementation returns its 'def' value, which is described in the
642+ -- Default implementation returns its 'def' value, which is described in
267− -- documentation for the type. Common usage pattern with manually defined
643+ -- the documentation for the type. Common usage pattern with manually
268− -- 'getHttpConfig' is to return some hard-coded value, or value extracted
644+ -- defined 'getHttpConfig' is to return some hard-coded value, or a value
269− -- from 'Control.Monad.Reader.MonadReader' if a more flexible approach to
645+ -- extracted from 'Control.Monad.Reader.MonadReader' if a more flexible
270− -- configuration is desirable.
646+ -- approach to configuration is desirable.
272 getHttpConfig :: m HttpConfig
647 getHttpConfig :: m HttpConfig
273− getHttpConfig = return def
648+ getHttpConfig = return defaultHttpConfig
275−-- | 'HttpConfig' contains general and default settings to be used when
276−-- making HTTP requests.
650+-- | 'HttpConfig' contains settings to be used when making HTTP requests.
278data HttpConfig = HttpConfig
651data HttpConfig = HttpConfig
279− { httpConfigProxy :: !(Maybe L.Proxy)
280− -- ^ Proxy to use. By default values of @HTTP_PROXY@ and @HTTPS_PROXY@
652+ { -- | Proxy to use. By default values of @HTTP_PROXY@ and @HTTPS_PROXY@
281 -- environment variables are respected, this setting overwrites them.
653 -- environment variables are respected, this setting overwrites them.
282 -- Default value: 'Nothing'.
654 -- Default value: 'Nothing'.
283− , httpConfigRedirectCount :: !Word
655+ httpConfigProxy :: Maybe L.Proxy,
284− -- ^ How many redirects to follow when getting a resource. Default
656+ -- | How many redirects to follow when getting a resource. Default
285 -- value: 10.
657 -- value: 10.
286− , httpConfigAltManager :: !(Maybe L.Manager)
658+ httpConfigRedirectCount :: Int,
287− -- ^ Alternative 'L.Manager' to use. 'Nothing' (default value) means
659+ -- | Alternative 'L.Manager' to use. 'Nothing' (default value) means
288− -- that default implicit manager will be used (that's what you want in
660+ -- that the default implicit manager will be used (that's what you want
289− -- 99% of cases).
661+ -- in 99% of cases).
290− , httpConfigCheckResponse :: L.Request -> L.Response L.BodyReader -> IO ()
662+ httpConfigAltManager :: Maybe L.Manager,
291− -- ^ Check the response immediately after receiving the status and
663+ -- | Function to check the response immediately after receiving the
664+ -- status and headers, before streaming of response body. The third
665+ -- argument is the beginning of response body (typically first 1024
292− -- headers. This is used for throwing exceptions on non-success status
666+ -- bytes). This is used for throwing exceptions on non-success status
667+ -- codes by default (set to @\\_ _ _ -> Nothing@ if this behavior is not
670+ -- When the value this function returns is 'Nothing', nothing will
671+ -- happen. When it there is 'L.HttpExceptionContent' inside 'Just', it
293− -- codes by default. Throwing is better then just returning a request
674+ -- Throwing is better then just returning a request with non-2xx status
294− -- with non-2xx status code because in that case something is wrong and
675+ -- code because in that case something is wrong and we need a way to
676+ -- short-cut execution (also remember that Req retries automatically on
677+ -- request timeouts and such, so when your request fails, it's certainly
295− -- we need a way to short-cut execution. The thrown exception is caught
678+ -- something exceptional). The thrown exception is caught by the library
296− -- by the library though and is available in 'handleHttpException',
679+ -- though and is available in 'handleHttpException'.
297− -- which see.
680+ --
298− } deriving Typeable
681+ -- __Note__: signature of this function was changed in the version
300−instance Default HttpConfig where
683+ --
685+ httpConfigCheckResponse ::
690+ Maybe L.HttpExceptionContent,
691+ -- | The retry policy to use for request retrying. By default 'def' is
692+ -- used (see 'RetryPolicyM').
694+ -- __Note__: signature of this function was changed to disallow 'IO' in
695+ -- version /1.0.0/ and then changed back to its current form in /3.1.0/.
698+ httpConfigRetryPolicy :: RetryPolicyM IO,
699+ -- | The function is used to decide whether to retry a request. 'True'
700+ -- means that the request should be retried.
702+ -- __Note__: signature of this function was changed in the version
706+ httpConfigRetryJudge :: forall b. RetryStatus -> L.Response b -> Bool,
707+ -- | Similar to 'httpConfigRetryJudge', but is used to decide when to
708+ -- retry requests that resulted in an exception. By default it retries
709+ -- on response timeout and connection timeout (changed in version
713+ httpConfigRetryJudgeException :: RetryStatus -> SomeException -> Bool,
714+ -- | Max length of preview fragment of response body.
717+ httpConfigBodyPreviewLength :: forall a. (Num a) => a
720+-- | The default value of 'HttpConfig'.
723+defaultHttpConfig :: HttpConfig
301− def = HttpConfig
725+ HttpConfig
302− { httpConfigProxy = Nothing
726+ { httpConfigProxy = Nothing,
303− , httpConfigRedirectCount = 10
727+ httpConfigRedirectCount = 10,
304− , httpConfigAltManager = Nothing
728+ httpConfigAltManager = Nothing,
305− , httpConfigCheckResponse = \_ response ->
729+ httpConfigCheckResponse = \_ response preview ->
306− let Y.Status statusCode _ = L.responseStatus response in
730+ let scode = statusCode response
307− unless (200 <= statusCode && statusCode < 300) $ do
731+ in if 200 <= scode && scode < 300
308− chunk <- BL.toStrict <$> L.brReadSome (L.responseBody response) 1024
732+ then Nothing
309− LI.throwHttp (L.StatusCodeException (() <$ response) chunk) }
733+ else Just (L.StatusCodeException (void response) preview),
734+ httpConfigRetryPolicy = retryPolicyDefault,
735+ httpConfigRetryJudge = \_ response ->
737+ `elem` [ 408, -- Request timeout
738+ 504, -- Gateway timeout
739+ 524, -- A timeout occurred
740+ 598, -- (Informal convention) Network read timeout error
741+ 599 -- (Informal convention) Network connect timeout error
743+ httpConfigRetryJudgeException = \_ e ->
744+ case fromException e of
745+ Just (L.HttpExceptionRequest _ c) ->
747+ L.ResponseTimeout -> True
748+ L.ConnectionTimeout -> True
751+ httpConfigBodyPreviewLength = 1024
754+ statusCode = Y.statusCode . L.responseStatus
311instance RequestComponent HttpConfig where
756instance RequestComponent HttpConfig where
312 getRequestMod HttpConfig {..} = Endo $ \x ->
757 getRequestMod HttpConfig {..} = Endo $ \x ->
313− x { L.proxy = httpConfigProxy
759+ { L.proxy = httpConfigProxy,
314− , L.redirectCount = fromIntegral httpConfigRedirectCount
760+ L.redirectCount = httpConfigRedirectCount,
315− , LI.requestManagerOverride = httpConfigAltManager
761+ LI.requestManagerOverride = httpConfigAltManager
316− , LI.checkResponse = httpConfigCheckResponse }
762+ }
764+-- | A monad that allows us to run 'req' in any 'IO'-enabled monad without
765+-- having to define new instances.
768+newtype Req a = Req (ReaderT HttpConfig IO a)
778+deriving instance MonadThrow Req
781+deriving instance MonadCatch Req
784+deriving instance MonadMask Req
786+instance MonadBase IO Req where
789+instance MonadBaseControl IO Req where
791+ liftBaseWith f = Req . ReaderT $ \r -> f (runReq r)
792+ {-# INLINEABLE liftBaseWith #-}
793+ restoreM = Req . ReaderT . const . return
794+ {-# INLINEABLE restoreM #-}
796+instance MonadHttp Req where
797+ handleHttpException = Req . lift . throwIO
798+ getHttpConfig = Req ask
801+instance (MonadHttp m, Monoid w) => MonadHttp (AccumT w m) where
802+ handleHttpException = lift . handleHttpException
803+ getHttpConfig = lift getHttpConfig
806+instance (MonadHttp m) => MonadHttp (ContT r m) where
807+ handleHttpException = lift . handleHttpException
808+ getHttpConfig = lift getHttpConfig
811+instance (MonadHttp m) => MonadHttp (ExceptT e m) where
812+ handleHttpException = lift . handleHttpException
813+ getHttpConfig = lift getHttpConfig
816+instance (MonadHttp m) => MonadHttp (IdentityT m) where
817+ handleHttpException = lift . handleHttpException
818+ getHttpConfig = lift getHttpConfig
821+instance (MonadHttp m) => MonadHttp (MaybeT m) where
822+ handleHttpException = lift . handleHttpException
823+ getHttpConfig = lift getHttpConfig
826+instance (MonadHttp m) => MonadHttp (ReaderT r m) where
827+ handleHttpException = lift . handleHttpException
828+ getHttpConfig = lift getHttpConfig
831+instance (MonadHttp m, Monoid w) => MonadHttp (RWS.CPS.RWST r w s m) where
832+ handleHttpException = lift . handleHttpException
833+ getHttpConfig = lift getHttpConfig
836+instance (MonadHttp m, Monoid w) => MonadHttp (RWS.Lazy.RWST r w s m) where
837+ handleHttpException = lift . handleHttpException
838+ getHttpConfig = lift getHttpConfig
841+instance (MonadHttp m, Monoid w) => MonadHttp (RWS.Strict.RWST r w s m) where
842+ handleHttpException = lift . handleHttpException
843+ getHttpConfig = lift getHttpConfig
846+instance (MonadHttp m) => MonadHttp (SelectT r m) where
847+ handleHttpException = lift . handleHttpException
848+ getHttpConfig = lift getHttpConfig
851+instance (MonadHttp m) => MonadHttp (State.Lazy.StateT s m) where
852+ handleHttpException = lift . handleHttpException
853+ getHttpConfig = lift getHttpConfig
856+instance (MonadHttp m) => MonadHttp (State.Strict.StateT s m) where
857+ handleHttpException = lift . handleHttpException
858+ getHttpConfig = lift getHttpConfig
861+instance (MonadHttp m, Monoid w) => MonadHttp (Writer.CPS.WriterT w m) where
862+ handleHttpException = lift . handleHttpException
863+ getHttpConfig = lift getHttpConfig
866+instance (MonadHttp m, Monoid w) => MonadHttp (Writer.Lazy.WriterT w m) where
867+ handleHttpException = lift . handleHttpException
868+ getHttpConfig = lift getHttpConfig
871+instance (MonadHttp m, Monoid w) => MonadHttp (Writer.Strict.WriterT w m) where
872+ handleHttpException = lift . handleHttpException
873+ getHttpConfig = lift getHttpConfig
875+-- | Run a computation in the 'Req' monad with the given 'HttpConfig'. In
876+-- the case of an exceptional situation an 'HttpException' will be thrown.
881+ -- | 'HttpConfig' to use
883+ -- | Computation to run
886+runReq config (Req m) = liftIO (runReaderT m config)
318----------------------------------------------------------------------------
888----------------------------------------------------------------------------
319−-- Request — Methods
889+-- Request—Method
321−-- $request-methods
891+-- $method
323−-- The package provides all methods as defined by RFC 2616, and 'PATCH'
893+-- The package supports all methods as defined by RFC 2616, and 'PATCH'
324−-- which is defined by RFC 5789 — that should be enough to talk to RESTful
894+-- which is defined by RFC 5789—that should be enough to talk to RESTful
325−-- APIs. In some cases however, you may want to add more methods (e.g. you
895+-- APIs. In some cases, however, you may want to add more methods (e.g. you
326-- work with WebDAV <https://en.wikipedia.org/wiki/WebDAV>); no need to
896-- work with WebDAV <https://en.wikipedia.org/wiki/WebDAV>); no need to
327-- compromise on type safety and hack, it only takes a couple of seconds to
897-- compromise on type safety and hack, it only takes a couple of seconds to
328-- define a new method that will works seamlessly, see 'HttpMethod'.
898-- define a new method that will works seamlessly, see 'HttpMethod'.
330-- | 'GET' method.
900-- | 'GET' method.
332data GET = GET
901data GET = GET
334instance HttpMethod GET where
903instance HttpMethod GET where
@@ -336,7 +905,6 @@ instance HttpMethod GET where
336 httpMethodName Proxy = Y.methodGet
905 httpMethodName Proxy = Y.methodGet
338-- | 'POST' method.
907-- | 'POST' method.
340data POST = POST
908data POST = POST
342instance HttpMethod POST where
910instance HttpMethod POST where
@@ -344,7 +912,6 @@ instance HttpMethod POST where
344 httpMethodName Proxy = Y.methodPost
912 httpMethodName Proxy = Y.methodPost
346-- | 'HEAD' method.
914-- | 'HEAD' method.
348data HEAD = HEAD
915data HEAD = HEAD
350instance HttpMethod HEAD where
917instance HttpMethod HEAD where
@@ -352,23 +919,24 @@ instance HttpMethod HEAD where
352 httpMethodName Proxy = Y.methodHead
919 httpMethodName Proxy = Y.methodHead
354-- | 'PUT' method.
921-- | 'PUT' method.
356data PUT = PUT
922data PUT = PUT
358instance HttpMethod PUT where
924instance HttpMethod PUT where
359 type AllowsBody PUT = 'CanHaveBody
925 type AllowsBody PUT = 'CanHaveBody
360 httpMethodName Proxy = Y.methodPut
926 httpMethodName Proxy = Y.methodPut
362−-- | 'DELETE' method.
928+-- | 'DELETE' method. RFC 7231 allows a payload in DELETE but without
931+-- __Note__: before version /3.4.0/ this method did not allow request
364data DELETE = DELETE
933data DELETE = DELETE
366instance HttpMethod DELETE where
935instance HttpMethod DELETE where
367− type AllowsBody DELETE = 'NoBody
936+ type AllowsBody DELETE = 'CanHaveBody
368 httpMethodName Proxy = Y.methodDelete
937 httpMethodName Proxy = Y.methodDelete
370-- | 'TRACE' method.
939-- | 'TRACE' method.
372data TRACE = TRACE
940data TRACE = TRACE
374instance HttpMethod TRACE where
942instance HttpMethod TRACE where
@@ -376,7 +944,6 @@ instance HttpMethod TRACE where
376 httpMethodName Proxy = Y.methodTrace
944 httpMethodName Proxy = Y.methodTrace
378-- | 'CONNECT' method.
946-- | 'CONNECT' method.
380data CONNECT = CONNECT
947data CONNECT = CONNECT
382instance HttpMethod CONNECT where
949instance HttpMethod CONNECT where
@@ -384,7 +951,6 @@ instance HttpMethod CONNECT where
384 httpMethodName Proxy = Y.methodConnect
951 httpMethodName Proxy = Y.methodConnect
386-- | 'OPTIONS' method.
953-- | 'OPTIONS' method.
388data OPTIONS = OPTIONS
954data OPTIONS = OPTIONS
390instance HttpMethod OPTIONS where
956instance HttpMethod OPTIONS where
@@ -392,7 +958,6 @@ instance HttpMethod OPTIONS where
392 httpMethodName Proxy = Y.methodOptions
958 httpMethodName Proxy = Y.methodOptions
394-- | 'PATCH' method.
960-- | 'PATCH' method.
396data PATCH = PATCH
961data PATCH = PATCH
398instance HttpMethod PATCH where
963instance HttpMethod PATCH where
@@ -400,41 +965,43 @@ instance HttpMethod PATCH where
400 httpMethodName Proxy = Y.methodPatch
965 httpMethodName Proxy = Y.methodPatch
402-- | A type class for types that can be used as an HTTP method. To define a
967-- | A type class for types that can be used as an HTTP method. To define a
403−-- non-standard method, follow this example that defines COPY:
968+-- non-standard method, follow this example that defines @COPY@:
405-- > data COPY = COPY
970-- > data COPY = COPY
407-- > instance HttpMethod COPY where
972-- > instance HttpMethod COPY where
408-- > type AllowsBody COPY = 'CanHaveBody
973-- > type AllowsBody COPY = 'CanHaveBody
409-- > httpMethodName Proxy = "COPY"
974-- > httpMethodName Proxy = "COPY"
411class HttpMethod a where
975class HttpMethod a where
413− -- | Type function 'AllowsBody' returns type of kind 'CanHaveBody' which
976+ -- | Type function 'AllowsBody' returns a type of kind 'CanHaveBody' which
414− -- tells the rest of the library whether the method can have a body or
977+ -- tells the rest of the library whether the method can have body or not.
415− -- not. We use the special type 'CanHaveBody' “lifted” into kind instead
978+ -- We use the special type 'CanHaveBody' lifted to the kind level instead
416 -- of 'Bool' to get more user-friendly compiler messages.
979 -- of 'Bool' to get more user-friendly compiler messages.
418 type AllowsBody a :: CanHaveBody
980 type AllowsBody a :: CanHaveBody
420 -- | Return name of the method as a 'ByteString'.
982 -- | Return name of the method as a 'ByteString'.
983+ httpMethodName :: Proxy a -> ByteString
422− httpMethodName :: Proxy a -> Y.Method
424−instance HttpMethod method => RequestComponent (Womb "method" method) where
985+instance (HttpMethod method) => RequestComponent (Tagged "method" method) where
425 getRequestMod _ = Endo $ \x ->
986 getRequestMod _ = Endo $ \x ->
426− x { L.method = httpMethodName (Proxy :: Proxy method) }
987+ x {L.method = httpMethodName (Proxy :: Proxy method)}
428----------------------------------------------------------------------------
989----------------------------------------------------------------------------
429−-- Request — URL
990+-- Request—URL
994+-- We use 'Url's which are correct by construction, see 'Url'. To build a
995+-- 'Url' from a 'URI', use 'useHttpURI', 'useHttpsURI', or generic 'useURI'.
431-- | Request's 'Url'. Start constructing your 'Url' with 'http' or 'https'
997-- | Request's 'Url'. Start constructing your 'Url' with 'http' or 'https'
432−-- specifying the scheme and host at the same time. Then use the @('/:')@
998+-- specifying the scheme and host at the same time. Then use the @('/~')@
433−-- constructor to grow path one piece at a time. Every single piece of path
999+-- and @('/:')@ operators to grow the path one piece at a time. Every single
434−-- will be url(percent)-encoded, so @('/:')@ is the only way to have forward
1000+-- piece of path will be url(percent)-encoded, so using @('/~')@ and
1001+-- @('/:')@ is the only way to have forward slashes between path segments.
435−-- slashes between path segments. This approach makes working with dynamic
1002+-- This approach makes working with dynamic path segments easy and safe. See
436−-- path segments easy and safe. See examples below how to represent various
1003+-- examples below how to represent various 'Url's (make sure the
437−-- 'Url's (make sure the @OverloadedStrings@ language extension is enabled).
1004+-- @OverloadedStrings@ language extension is enabled).
439-- ==== __Examples__
1006-- ==== __Examples__
@@ -450,243 +1017,636 @@ instance HttpMethod method => RequestComponent (Womb "method" method) where
450-- > https "httpbin.org" /: "foo" /: "bar/baz"
1017-- > https "httpbin.org" /: "foo" /: "bar/baz"
451-- > -- https://httpbin.org/foo/bar%2Fbaz
1018-- > -- https://httpbin.org/foo/bar%2Fbaz
1020+-- > https "httpbin.org" /: "bytes" /~ (10 :: Int)
1021+-- > -- https://httpbin.org/bytes/10
453-- > https "юникод.рф"
1023-- > https "юникод.рф"
454-- > -- https://%D1%8E%D0%BD%D0%B8%D0%BA%D0%BE%D0%B4.%D1%80%D1%84
1024-- > -- https://%D1%8E%D0%BD%D0%B8%D0%BA%D0%BE%D0%B4.%D1%80%D1%84
456data Url (scheme :: Scheme) = Url Scheme (NonEmpty Text)
1025data Url (scheme :: Scheme) = Url Scheme (NonEmpty Text)
457− -- NOTE The second value is path segments in reversed order.
1026+ -- NOTE The second value is the path segments in reversed order.
458− deriving (Eq, Ord, Show, Data, Typeable, Generic)
1027+ deriving (Eq, Ord, Show, Data, Generic)
1029+type role Url nominal
1031+-- With template-haskell >=2.15 and text >=1.2.4 Lift can be derived, however
1032+-- the derived lift forgets the type of the scheme.
1033+instance (Typeable scheme) => TH.Lift (Url scheme) where
1035+ TH.dataToExpQ (fmap liftText . cast) url `TH.sigE` case url of
1036+ Url Http _ -> [t|Url 'Http|]
1037+ Url Https _ -> [t|Url 'Https|]
1039+ liftText t = TH.AppE (TH.VarE 'T.pack) <$> TH.lift (T.unpack t)
1040+ liftTyped = TH.Code . TH.unsafeTExpCoerce . TH.lift
460−-- | Given host name, produce a 'Url' which have “http” as its scheme and
1042+-- | Given host name, produce a 'Url' which has “http” as its scheme and
461-- empty path. This also sets port to @80@.
1043-- empty path. This also sets port to @80@.
463http :: Text -> Url 'Http
1044http :: Text -> Url 'Http
464http = Url Http . pure
1045http = Url Http . pure
466−-- | Given host name, produce a 'Url' which have “https” as its scheme and
1047+-- | Given host name, produce a 'Url' which has “https” as its scheme and
467-- empty path. This also sets port to @443@.
1048-- empty path. This also sets port to @443@.
469https :: Text -> Url 'Https
1049https :: Text -> Url 'Https
470https = Url Https . pure
1050https = Url Https . pure
472−-- | Grow given 'Url' appending a single path segment to it.
1052+-- | Grow a given 'Url' appending a single path segment to it. Note that the
1053+-- path segment can be of any type that is an instance of 'ToHttpApiData'.
1056+(/~) :: (ToHttpApiData a) => Url scheme -> a -> Url scheme
1057+Url secure path /~ segment = Url secure (NE.cons (toUrlPiece segment) path)
1059+-- | A type-constrained version of @('/~')@ to remove ambiguity in the cases
1060+-- when next URL piece is a 'Data.Text.Text' literal.
474infixl 5 /:
1061infixl 5 /:
475(/:) :: Url scheme -> Text -> Url scheme
1063(/:) :: Url scheme -> Text -> Url scheme
476−Url secure path /: segment = Url secure (NE.cons segment path)
1064+(/:) = (/~)
1066+-- | Render a 'Url' as 'Text'.
1069+renderUrl :: Url scheme -> Text
1072+ "https://" <> renderParts parts
1074+ "http://" <> renderParts parts
1076+ renderParts parts =
1077+ T.intercalate "/" (reverse $ NE.toList parts)
478−-- | The 'parseUrlHttp' function provides an alternative method to get 'Url'
1079+-- | The 'useHttpURI' function provides an alternative method to get 'Url'
479−-- (possibly with some 'Option's) from a 'ByteString'. This is useful when
1080+-- (possibly with some 'Option's) from a 'URI'. This is useful when you are
480−-- you are given an URL to query dynamically and don't know it beforehand.
1081+-- given a URL to query dynamically and don't know it beforehand.
481−-- The function parses 'ByteString' because it's a correct type to hold an
1082+--
482−-- URL, as 'Url' cannot contain characters outside of ASCII range, thus we
1083+-- This function expects the scheme to be “http” and host to be present.
483−-- can consider every character a 'Data.Word.Word8' value.
1084+--
484−--
1085+-- @since 3.0.0
485−-- This function only parses 'Url' (scheme, host, path) and optional query
1086+useHttpURI :: URI -> Maybe (Url 'Http, Option scheme)
486−-- parameters that are returned as 'Option'. It does not parse method name
1087+useHttpURI uri = do
487−-- or authentication info from given 'ByteString'.
1088+ guard (URI.uriScheme uri == Just [QQ.scheme|http|])
488−
1089+ urlHead <- http <$> uriHost uri
489−parseUrlHttp :: ByteString -> Maybe (Url 'Http, Option scheme)
1090+ let url = case URI.uriPath uri of
490−parseUrlHttp url' = do
1091+ Nothing -> urlHead
491− url <- B.stripPrefix "http://" url'
1092+ Just uriPath -> uriPathToUrl uriPath urlHead
492− (host :| path, option) <- parseUrlHelper url
1093+ return (url, uriOptions uri)
493− return (foldl (/:) (http host) path, option)
1094+
495−-- | Just like 'parseUrlHttp', but expects “https” scheme.
1095+-- | Just like 'useHttpURI', but expects the “https” scheme.
497−parseUrlHttps :: ByteString -> Maybe (Url 'Https, Option scheme)
1098+useHttpsURI :: URI -> Maybe (Url 'Https, Option scheme)
498−parseUrlHttps url' = do
1099+useHttpsURI uri = do
499− url <- B.stripPrefix "https://" url'
1100+ guard (URI.uriScheme uri == Just [QQ.scheme|https|])
500− (host :| path, option) <- parseUrlHelper url
1101+ urlHead <- https <$> uriHost uri
501− return (foldl (/:) (https host) path, option)
1102+ let url = case URI.uriPath uri of
502−
1103+ Nothing -> urlHead
503−-- | Get host\/collection of path pieces and possibly query parameters
1104+ Just uriPath -> uriPathToUrl uriPath urlHead
504−-- already converted to 'Option'. This function is not public.
1105+ return (url, uriOptions uri)
506−parseUrlHelper :: ByteString -> Maybe (NonEmpty Text, Option scheme)
1107+-- | Convert URI path to a 'Url'. Internal.
507−parseUrlHelper url = do
1108+--
508− let (path', query') = B.break (== 0x3f) url
1109+-- @since 3.9.0
509− query = mconcat (uncurry queryParam <$> Y.parseQueryText query')
1110+uriPathToUrl ::
510− path <- NE.nonEmpty (Y.decodePathSegments path')
1111+ (Bool, NonEmpty (URI.RText 'URI.PathPiece)) ->
511− return (path, query)
1112+ Url scheme ->
1114+uriPathToUrl (trailingSlash, xs) urlHead =
1115+ if trailingSlash then path /: T.empty else path
1117+ path = foldl' (/:) urlHead (URI.unRText <$> NE.toList xs)
1119+-- | A combination of 'useHttpURI' and 'useHttpsURI' for cases when scheme
1120+-- is not known in advance.
1127+ (Url 'Http, Option scheme0)
1128+ (Url 'Https, Option scheme1)
1131+ (Left <$> useHttpURI uri) <|> (Right <$> useHttpsURI uri)
1133+-- | An internal helper function to extract host from a 'URI'.
1134+uriHost :: URI -> Maybe Text
1135+uriHost uri = case URI.uriAuthority uri of
1137+ Right URI.Authority {..} ->
1138+ Just (URI.unRText authHost)
1140+-- | A quasiquoter to build an 'Url' and 'Option' tuple. The type of the
1141+-- generated expression is @('Url' scheme0, 'Option' scheme1)@ with
1142+-- @scheme0@ being either 'Http' or 'Https' depending on the input.
1145+urlQ :: TH.QuasiQuoter
1148+ { quoteExp = \str ->
1149+ case URI.mkURI (T.pack str) of
1150+ Left err -> fail (displayException err)
1151+ Right uri -> case useURI uri of
1152+ Nothing -> fail "Not a HTTP or HTTPS URL"
1155+ [ either (TH.lift . fst) (TH.lift . fst) eurl,
1158+ quotePat = error "This usage is not supported",
1159+ quoteType = error "This usage is not supported",
1160+ quoteDec = error "This usage is not supported"
1163+-- | An internal helper function to extract 'Option's from a 'URI'.
1164+uriOptions :: forall scheme. URI -> Option scheme
1174+ case URI.uriAuthority uri of
1175+ Left _ -> (mempty, mempty)
1176+ Right URI.Authority {..} ->
1177+ let auth0 = case authUserInfo of
1179+ Just URI.UserInfo {..} ->
1180+ let username = T.encodeUtf8 (URI.unRText uiUsername)
1181+ password = maybe "" (T.encodeUtf8 . URI.unRText) uiPassword
1182+ in basicAuthUnsafe username password
1183+ port0 = case authPort of
1185+ Just port'' -> port (fromIntegral port'')
1188+ let liftQueryParam = \case
1189+ URI.QueryFlag t -> queryFlag (URI.unRText t)
1190+ URI.QueryParam k v -> URI.unRText k =: URI.unRText v
1191+ in mconcat (liftQueryParam <$> URI.uriQuery uri)
1193+-- TODO Blocked on upstream: https://github.com/snoyberg/http-client/issues/424
1195+-- case URI.uriFragment uri of
1196+-- Nothing -> mempty
1197+-- Just fragment'' -> fragment (URI.unRText fragment'')
513instance RequestComponent (Url scheme) where
1199instance RequestComponent (Url scheme) where
514 getRequestMod (Url scheme segments) = Endo $ \x ->
1200 getRequestMod (Url scheme segments) = Endo $ \x ->
515− let (host :| path) = NE.reverse segments in
1201+ let (host :| path) = NE.reverse segments
516− x { L.secure = case scheme of
1203+ { L.secure = case scheme of
517− Http -> False
1204+ Http -> False
518− Https -> True
1205+ Https -> True,
519− , L.port = case scheme of
1206+ L.port = case scheme of
520− Http -> 80
1207+ Http -> 80
521− Https -> 443
1208+ Https -> 443,
522− , L.host = Y.urlEncode False (T.encodeUtf8 host)
1209+ L.host = Y.urlEncode False (T.encodeUtf8 host),
523− , L.path =
1210+ L.path =
524− (BL.toStrict . R.toLazyByteString . Y.encodePathSegments) path }
1211+ (BL.toStrict . BB.toLazyByteString . Y.encodePathSegments) path
526----------------------------------------------------------------------------
1214----------------------------------------------------------------------------
527−-- Request — Body
1215+-- Request—Body
1219+-- A number of options for request bodies are available. The @Content-Type@
1220+-- header is set for you automatically according to the body option you use
1221+-- (it's always specified in the documentation for a given body option). To
1222+-- add your own way to represent request body, define an instance of
1225+-- | This data type represents empty body of an HTTP request. This is the
1226+-- data type to use with 'HttpMethod's that cannot have a body, as it's the
1227+-- only type for which 'ProvidesBody' returns 'NoBody'.
1229+-- Using of this body option does not set the @Content-Type@ header.
1230+data NoReqBody = NoReqBody
1232+instance HttpBody NoReqBody where
1233+ getRequestBody NoReqBody = L.RequestBodyBS B.empty
1235+-- | This body option allows us to use a JSON object as the request
1236+-- body—probably the most popular format right now. Just wrap a data type
1237+-- that is an instance of 'ToJSON' type class and you are done: it will be
1238+-- converted to JSON and inserted as request body.
1240+-- This body option sets the @Content-Type@ header to @\"application/json;
1241+-- charset=utf-8\"@ value.
1242+newtype ReqBodyJson a = ReqBodyJson a
1244+instance (ToJSON a) => HttpBody (ReqBodyJson a) where
1245+ getRequestBody (ReqBodyJson a) = L.RequestBodyLBS (A.encode a)
1246+ getRequestContentType _ = pure "application/json; charset=utf-8"
1248+-- | This body option streams request body from a file. It is expected that
1249+-- the file size does not change during streaming.
1251+-- Using of this body option does not set the @Content-Type@ header.
1252+newtype ReqBodyFile = ReqBodyFile FilePath
529−class HttpBody b where
1254+instance HttpBody ReqBodyFile where
530− type ProvidesBody b :: CanHaveBody
1255+ getRequestBody (ReqBodyFile path) =
531− getReqestBody :: b -> ByteString -- FIXME should use a conduit here
1256+ LI.RequestBodyIO (L.streamFile path)
1258+-- | HTTP request body represented by a strict 'ByteString'.
1260+-- Using of this body option does not set the @Content-Type@ header.
1261+newtype ReqBodyBs = ReqBodyBs ByteString
1263+instance HttpBody ReqBodyBs where
1264+ getRequestBody (ReqBodyBs bs) = L.RequestBodyBS bs
1266+-- | HTTP request body represented by a lazy 'BL.ByteString'.
1268+-- Using of this body option does not set the @Content-Type@ header.
1269+newtype ReqBodyLbs = ReqBodyLbs BL.ByteString
1271+instance HttpBody ReqBodyLbs where
1272+ getRequestBody (ReqBodyLbs bs) = L.RequestBodyLBS bs
1274+-- | URL-encoded body. This can hold a collection of parameters which are
1275+-- encoded similarly to query parameters at the end of query string, with
1276+-- the only difference that they are stored in request body. The similarity
1277+-- is reflected in the API as well, as you can use the same combinators you
1278+-- would use to add query parameters: @('=:')@ and 'queryFlag'.
1280+-- This body option sets the @Content-Type@ header to
1281+-- @\"application/x-www-form-urlencoded\"@ value.
1282+newtype ReqBodyUrlEnc = ReqBodyUrlEnc FormUrlEncodedParam
1284+instance HttpBody ReqBodyUrlEnc where
1285+ getRequestBody (ReqBodyUrlEnc (FormUrlEncodedParam params)) =
1286+ (L.RequestBodyLBS . BB.toLazyByteString) (Y.renderQueryText False params)
1287+ getRequestContentType _ = pure "application/x-www-form-urlencoded"
1289+-- | An opaque monoidal value that allows to collect URL-encoded parameters
1290+-- to be wrapped in 'ReqBodyUrlEnc'.
533−data FormUrlEncodedParam = FormUrlEncodedParam Text (Maybe Text)
1291+newtype FormUrlEncodedParam = FormUrlEncodedParam [(Text, Maybe Text)]
1292+ deriving (Semigroup, Monoid)
535instance QueryParam FormUrlEncodedParam where
1294instance QueryParam FormUrlEncodedParam where
1295+ queryParam name mvalue =
1296+ FormUrlEncodedParam [(name, toQueryParam <$> mvalue)]
536− queryParam = FormUrlEncodedParam
1297+ queryParamToList (FormUrlEncodedParam p) = p
1299+-- | Use 'formToQuery'.
1302+instance FromForm FormUrlEncodedParam where
1303+ fromForm = Right . formToQuery
1305+-- | Multipart form data. Please consult the
1306+-- "Network.HTTP.Client.MultipartFormData" module for how to construct
1307+-- parts, then use 'reqBodyMultipart' to create actual request body from the
1308+-- parts. 'reqBodyMultipart' is the only way to get a value of the type
1309+-- 'ReqBodyMultipart', as its constructor is not exported on purpose.
1313+-- ==== __Examples__
1315+-- > import Control.Monad.IO.Class
1316+-- > import Data.Default.Class
1317+-- > import Network.HTTP.Req
1318+-- > import qualified Network.HTTP.Client.MultipartFormData as LM
1321+-- > main = runReq def $ do
1323+-- > reqBodyMultipart
1324+-- > [ LM.partBS "title" "My Image"
1325+-- > , LM.partFileSource "file1" "/tmp/image.jpg"
1328+-- > req POST (http "example.com" /: "post")
1332+-- > liftIO $ print (responseBody response)
1333+data ReqBodyMultipart = ReqBodyMultipart ByteString LI.RequestBody
1335+instance HttpBody ReqBodyMultipart where
1336+ getRequestBody (ReqBodyMultipart _ body) = body
1337+ getRequestContentType (ReqBodyMultipart boundary _) =
1338+ pure ("multipart/form-data; boundary=" <> boundary)
1340+-- | Create 'ReqBodyMultipart' request body from a collection of 'LM.Part's.
1343+reqBodyMultipart :: (MonadIO m) => [LM.Part] -> m ReqBodyMultipart
1344+reqBodyMultipart parts = liftIO $ do
1345+ boundary <- LM.webkitBoundary
1346+ body <- LM.renderParts boundary parts
1347+ return (ReqBodyMultipart boundary body)
1349+-- | A type class for things that can be interpreted as an HTTP
1351+class HttpBody body where
1352+ -- | How to get actual 'L.RequestBody'.
1353+ getRequestBody :: body -> L.RequestBody
1355+ -- | This method allows us to optionally specify the value of
1356+ -- @Content-Type@ header that should be used with particular body option.
1357+ -- By default it returns 'Nothing' and so @Content-Type@ is not set.
1358+ getRequestContentType :: body -> Maybe ByteString
1359+ getRequestContentType = const Nothing
1361+-- | The type function recognizes 'NoReqBody' as having 'NoBody', while any
1362+-- other body option 'CanHaveBody'. This forces the user to use 'NoReqBody'
1363+-- with 'GET' method and other methods that should not have body.
1364+type family ProvidesBody body :: CanHaveBody where
1365+ ProvidesBody NoReqBody = 'NoBody
1366+ ProvidesBody body = 'CanHaveBody
1368+-- | This type function allows any HTTP body if method says it
1369+-- 'CanHaveBody'. When the method says it should have 'NoBody', the only
1370+-- body option to use is 'NoReqBody'.
1373+ (allowsBody :: CanHaveBody)
1374+ (providesBody :: CanHaveBody) ::
1377+ HttpBodyAllowed 'NoBody 'NoBody = ()
1378+ HttpBodyAllowed 'CanHaveBody body = ()
1379+ HttpBodyAllowed 'NoBody 'CanHaveBody =
1381+ ('Text "This HTTP method does not allow attaching a request body.")
538−instance HttpBody b => RequestComponent (Womb "body" b) where
1383+instance (HttpBody body) => RequestComponent (Tagged "body" body) where
539− getRequestMod = undefined -- FIXME
1384+ getRequestMod (Tagged body) = Endo $ \x ->
1386+ { L.requestBody = getRequestBody body,
1388+ let old = L.requestHeaders x
1389+ in case getRequestContentType body of
1391+ Just contentType ->
1392+ (Y.hContentType, contentType) : old
541----------------------------------------------------------------------------
1395----------------------------------------------------------------------------
542−-- Request — Optional parameters
1396+-- Request—Optional parameters
544−-- $request-optional-parameters
1398+-- $optional-parameters
546−-- Optional parameters to a request include things like query parameters,
1400+-- Optional parameters of request include things like query parameters,
547-- headers, port number, etc. All optional parameters have the type
1401-- headers, port number, etc. All optional parameters have the type
548-- 'Option', which is a 'Monoid'. This means that you can use 'mempty' as
1402-- 'Option', which is a 'Monoid'. This means that you can use 'mempty' as
549-- the last argument of 'req' to specify no optional parameters, or combine
1403-- the last argument of 'req' to specify no optional parameters, or combine
550−-- 'Option's using 'mappend' (or @('<>')@) to have several of them at once.
1404+-- 'Option's using 'mappend' or @('<>')@ to have several of them at once.
552−-- | Opaque 'Option' type is a 'Monoid' you can use to pack collection of
1406+-- | The opaque 'Option' type is a 'Monoid' you can use to pack collection
553−-- optional parameters like query parameters and headers. See sections below
1407+-- of optional parameters like query parameters and headers. See sections
554−-- to learn which 'Option' primitives are available.
1408+-- below to learn which 'Option' primitives are available.
1409+data Option (scheme :: Scheme)
1410+ = Option (Endo (Y.QueryText, L.Request)) (Maybe (L.Request -> IO L.Request))
556−-- TODO We need examples here.
558−data Option (scheme :: Scheme) =
559− Option (Endo (Y.QueryText, L.Request)) (Maybe (Endo L.Request))
560− -- NOTE 'QueryText' is just [(Text, Maybe Text)], we keep it along with
1412+-- NOTE 'QueryText' is just [(Text, Maybe Text)], we keep it along with
561− -- Request to avoid appending to existing query string in request every
1413+-- Request to avoid appending to an existing query string in request every
562− -- time new parameter is added. Additional Maybe (Endo Request) is a
1414+-- time new parameter is added. The additional Maybe (L.Request -> IO
563− -- finalizer that will be applied after all over options. This is for
1415+-- L.Request) is a finalizer that will be applied after all other
564− -- authentication methods that sign requests based on data in Request.
1416+-- transformations. This is for authentication methods that sign requests
1417+-- based on data in Request.
566instance Semigroup (Option scheme) where
1419instance Semigroup (Option scheme) where
567− Option er0 mr0 <> Option er1 mr1 = Option
1420+ Option er0 mr0 <> Option er1 mr1 =
568− (er0 <> er1) (mr0 <|> mr1)
1422+ (er0 <> er1)
570instance Monoid (Option scheme) where
1425instance Monoid (Option scheme) where
571− mempty = Option mempty Nothing
1426+ mempty = Option mempty Nothing
572 mappend = (<>)
1427 mappend = (<>)
574−-- | A helper to create an 'Option' that modifies only collection of query
1429+-- | Use 'formToQuery'.
575−-- parameters. This helper is not a part of public API.
1430+--
1432+instance FromForm (Option scheme) where
1433+ fromForm = Right . formToQuery
1435+-- | A helper to create an 'Option' that modifies only collection of query
1436+-- parameters. This helper is not a part of the public API.
577withQueryParams :: (Y.QueryText -> Y.QueryText) -> Option scheme
1437withQueryParams :: (Y.QueryText -> Y.QueryText) -> Option scheme
578withQueryParams f = Option (Endo (first f)) Nothing
1438withQueryParams f = Option (Endo (first f)) Nothing
580-- | A helper to create an 'Option' that modifies only 'L.Request'. This
1440-- | A helper to create an 'Option' that modifies only 'L.Request'. This
581-- helper is not a part of public API.
1441-- helper is not a part of public API.
583withRequest :: (L.Request -> L.Request) -> Option scheme
1442withRequest :: (L.Request -> L.Request) -> Option scheme
584withRequest f = Option (Endo (second f)) Nothing
1443withRequest f = Option (Endo (second f)) Nothing
586−-- | A helper to create an 'Option' that adds a finalier (request
587−-- endomorphism that is run after all other modifications).
589−withFinalizer :: (L.Request -> L.Request) -> Option scheme
590−withFinalizer f = Option mempty (Just (Endo f))
592instance RequestComponent (Option scheme) where
1445instance RequestComponent (Option scheme) where
593− getRequestMod (Option f finalizer) = Endo $ \x ->
1446+ getRequestMod (Option f _) = Endo $ \x ->
594 let (qparams, x') = appEndo f ([], x)
1447 let (qparams, x') = appEndo f ([], x)
595− query = Y.renderQuery True (Y.queryTextToQuery qparams)
1448+ query = Y.renderQuery True (Y.queryTextToQuery qparams)
596− in maybe id appEndo finalizer x' { L.queryString = query }
1449+ in x' {L.queryString = query}
1451+-- | Finalize given 'L.Request' by applying a finalizer from the given
1452+-- 'Option' (if it has any).
1453+finalizeRequest :: (MonadIO m) => Option scheme -> L.Request -> m L.Request
1454+finalizeRequest (Option _ mfinalizer) = liftIO . fromMaybe pure mfinalizer
598----------------------------------------------------------------------------
1456----------------------------------------------------------------------------
599−-- Request — Optional parameters — Query Parameters
1457+-- Request—Optional parameters—Query Parameters
1459+-- $query-parameters
1461+-- This section describes a polymorphic interface that can be used to
1462+-- construct query parameters (of the type 'Option') and form URL-encoded
1463+-- bodies (of the type 'FormUrlEncodedParam').
601-- | This operator builds a query parameter that will be included in URL of
1465-- | This operator builds a query parameter that will be included in URL of
602−-- your request after question sign @?@. This is the same syntax you use
1466+-- your request after the question sign @?@. This is the same syntax you use
603-- with form URL encoded request bodies.
1467-- with form URL encoded request bodies.
605-- This operator is defined in terms of 'queryParam':
1469-- This operator is defined in terms of 'queryParam':
607-- > name =: value = queryParam name (pure value)
1471-- > name =: value = queryParam name (pure value)
609infix 7 =:
1472infix 7 =:
610−(=:) :: QueryParam a => Text -> Text -> a
1474+(=:) :: (QueryParam param, ToHttpApiData a) => Text -> a -> param
611name =: value = queryParam name (pure value)
1475name =: value = queryParam name (pure value)
613−-- | Construct a flag, that is, valueless query parameter. For example, in
1477+-- | Construct a flag, that is, a valueless query parameter. For example, in
614−-- the following URL @a@ is a flag, @b@ is a query parameter with a value:
1478+-- the following URL @\"a\"@ is a flag, while @\"b\"@ is a query parameter
616-- > https://httpbin.org/foo/bar?a&b=10
1481-- > https://httpbin.org/foo/bar?a&b=10
618-- This operator is defined in terms of 'queryParam':
1483-- This operator is defined in terms of 'queryParam':
620−-- > queryFlag name = queryParam name Nothing
1485+-- > queryFlag name = queryParam name (Nothing :: Maybe ())
622−queryFlag :: QueryParam a => Text -> a
1486+queryFlag :: (QueryParam param) => Text -> param
623−queryFlag name = queryParam name Nothing
1487+queryFlag name = queryParam name (Nothing :: Maybe ())
1489+-- | Construct query parameters from a 'ToForm' instance. This function
1490+-- produces the same query params as 'Form.urlEncodeAsFormStable'.
1492+-- Note that 'Form.Form' doesn't have the concept of parameters with the
1493+-- empty value (i.e. what you can get by @key =: ""@). If the value is
1494+-- empty, it will be encoded as a valueless parameter (i.e. what you can get
1495+-- by @queryFlag key@).
1498+formToQuery :: (QueryParam param, Monoid param, ToForm f) => f -> param
1499+formToQuery f = mconcat . fmap toParam . Form.toListStable $ toForm f
1501+ toParam (key, val) =
625−-- | A type class for query-parameter-like things. The reason to have
1507+-- | A type class for query-parameter-like things. The reason to have an
626−-- overloaded 'queryParam' is to be able to use as an 'Option' and as a
1508+-- overloaded 'queryParam' is to be able to use it as an 'Option' and as a
627-- 'FormUrlEncodedParam' when constructing form URL encoded request bodies.
1509-- 'FormUrlEncodedParam' when constructing form URL encoded request bodies.
628-- Having the same syntax for these cases seems natural and user-friendly.
1510-- Having the same syntax for these cases seems natural and user-friendly.
630−class QueryParam a where
1511+class QueryParam param where
632 -- | Create a query parameter with given name and value. If value is
1512 -- | Create a query parameter with given name and value. If value is
633 -- 'Nothing', it won't be included at all (i.e. you create a flag this
1513 -- 'Nothing', it won't be included at all (i.e. you create a flag this
634 -- way). It's recommended to use @('=:')@ and 'queryFlag' instead of this
1514 -- way). It's recommended to use @('=:')@ and 'queryFlag' instead of this
635 -- method, because they are easier to read.
1515 -- method, because they are easier to read.
1516+ queryParam :: (ToHttpApiData a) => Text -> Maybe a -> param
637− queryParam :: Text -> Maybe Text -> a
1518+ -- | Get the query parameter names and values set by 'queryParam'.
1521+ queryParamToList :: param -> [(Text, Maybe Text)]
639instance QueryParam (Option scheme) where
1523instance QueryParam (Option scheme) where
640− queryParam name mvalue = withQueryParams ((:) (name, mvalue))
1524+ queryParam name mvalue =
1525+ withQueryParams ((:) (name, toQueryParam <$> mvalue))
1526+ queryParamToList (Option f _) = fst $ appEndo f ([], L.defaultRequest)
642----------------------------------------------------------------------------
1528----------------------------------------------------------------------------
643−-- Request — Optional parameters — Headers
1529+-- Request—Optional parameters—Headers
645−-- | Create an 'Option' that adds a header.
1531+-- | Create an 'Option' that adds a header. Note that if you 'mappend' two
646−
1532+-- headers with the same names the leftmost header will win. This means, in
1533+-- particular, that you cannot create a request with several headers of the
648− :: ByteString -- ^ Header name
1536+ -- | Header name
649− -> ByteString -- ^ Header value
1538+ -- | Header value
650− -> Option scheme
1540+ Option scheme
651−header name value = withRequest $ \x ->
1541+header name value = withRequest (attachHeader name value)
1543+-- | Attach a header with given name and content to a 'L.Request'.
1546+attachHeader :: ByteString -> ByteString -> L.Request -> L.Request
1547+attachHeader name value x =
652− x { L.requestHeaders = (CI.mk name, value) : L.requestHeaders x }
1548+ x {L.requestHeaders = (CI.mk name, value) : L.requestHeaders x}
654−----------------------------------------------------------------------------
655−-- Request — Optional parameters — Cookies
657−-- TODO No idea right now.
1550+-- | Same as 'header', but with redacted values on print.
1553+headerRedacted :: ByteString -> ByteString -> Option scheme
1554+headerRedacted name value = withRequest $ \x ->
1555+ let y = attachHeader name value x
1556+ in y {L.redactHeaders = CI.mk name `S.insert` L.redactHeaders y}
659----------------------------------------------------------------------------
1558----------------------------------------------------------------------------
660−-- Request — Optional parameters — Authentication
1559+-- Request—Optional parameters—Cookies
662−-- $request-optional-parameters-authentication
1561+-- $cookies
664−-- TODO Something. You should always prefer authentication 'Option's to
1563+-- Support for cookies is quite minimalistic at the moment. It's possible to
665−-- manual construction of headers, etc., because it's a better style and
1564+-- specify which cookies to send using 'cookieJar' and inspect 'L.Response'
666−-- provides additional type safety that prevents leaking of credentials.
1565+-- to extract 'L.CookieJar' from it (see 'responseCookieJar').
668−-- | OAuth 1 authentication 'Option'.
1567+-- | Use the given 'L.CookieJar'. A 'L.CookieJar' can be obtained from a
1568+-- 'L.Response' record.
1569+cookieJar :: L.CookieJar -> Option scheme
1570+cookieJar jar = withRequest $ \x ->
1571+ x {L.cookieJar = Just jar}
670−oAuth1
1573+----------------------------------------------------------------------------
671− :: ByteString -- ^ Consumer token
1574+-- Request—Optional parameters—Authentication
672− -> ByteString -- ^ Consumer secret
673− -> ByteString -- ^ OAuth token
674− -> ByteString -- ^ OAuth token secret
676−oAuth1 ctoken csecret otoken osecret = withFinalizer
677− (OAuth1.signRequest ctoken csecret otoken osecret)
679−-- | The 'Option' adds basic authentication. The 'Text' values will be UTF-8
1576+-- $authentication
1578+-- This section provides the common authentication helpers in the form of
1579+-- 'Option's. You should always prefer the provided authentication 'Option's
1580+-- to manual construction of headers because it ensures that you only use
1581+-- one authentication method at a time (they overwrite each other) and
1582+-- provides additional type safety that prevents leaking of credentials in
1583+-- the cases when authentication relies on HTTPS for encrypting sensitive
1586+-- | The 'Option' adds basic authentication.
682−-- See also: <https://en.wikipedia.org/wiki/Basic_access_authentication>
1588+-- See also: <https://en.wikipedia.org/wiki/Basic_access_authentication>.
684−basicAuth
1589+basicAuth ::
685− :: ByteString -- ^ Username
1590+ -- | Username
686− -> ByteString -- ^ Password
1592+ -- | Password
687− -> Option 'Https -- ^ Auth 'Option'
1595+ Option 'Https
1596+basicAuth = basicAuthUnsafe
1598+-- | An alternative to 'basicAuth' which works for any scheme. Note that
1599+-- using basic access authentication without SSL\/TLS is vulnerable to
1600+-- attacks. Use 'basicAuth' instead unless you know what you are doing.
688−basicAuth username password = withRequest
1610+basicAuthUnsafe username password =
689− (L.applyBasicAuth username password)
1612+ (pure . L.applyBasicAuth username password)
1614+-- | The 'Option' set basic proxy authentication header.
1624+basicProxyAuth username password =
1625+ withRequest (L.applyBasicProxyAuth username password)
1627+-- | The 'Option' adds OAuth1 authentication.
1631+ -- | Consumer token
1633+ -- | Consumer secret
1637+ -- | OAuth token secret
1641+oAuth1 consumerToken consumerSecret token tokenSecret =
1642+ customAuth (OAuth.signOAuth app creds)
1646+ { OAuth.oauthConsumerKey = consumerToken,
1647+ OAuth.oauthConsumerSecret = consumerSecret
1649+ creds = OAuth.newCredential token tokenSecret
691-- | The 'Option' adds an OAuth2 bearer token. This is treated by many
1651-- | The 'Option' adds an OAuth2 bearer token. This is treated by many
692-- services as the equivalent of a username and password.
1652-- services as the equivalent of a username and password.
@@ -694,11 +1654,16 @@ basicAuth username password = withRequest
694-- The 'Option' is defined as:
1654-- The 'Option' is defined as:
696-- > oAuth2Bearer token = header "Authorization" ("Bearer " <> token)
1656-- > oAuth2Bearer token = header "Authorization" ("Bearer " <> token)
1658+-- See also: <https://en.wikipedia.org/wiki/OAuth>.
698−oAuth2Bearer
1659+oAuth2Bearer ::
699− :: ByteString -- ^ Token
1660+ -- | Token
700− -> Option 'Https -- ^ Auth 'Option'
1663+ Option 'Https
1664+oAuth2Bearer token =
701−oAuth2Bearer token = header "Authorization" ("Bearer " <> token)
1666+ (pure . attachHeader "Authorization" ("Bearer " <> token))
703-- | The 'Option' adds a not-quite-standard OAuth2 bearer token (that seems
1668-- | The 'Option' adds a not-quite-standard OAuth2 bearer token (that seems
704-- to be used only by GitHub). This will be treated by whatever services
1669-- to be used only by GitHub). This will be treated by whatever services
@@ -707,34 +1672,37 @@ oAuth2Bearer token = header "Authorization" ("Bearer " <> token)
707-- The 'Option' is defined as:
1672-- The 'Option' is defined as:
709-- > oAuth2Token token = header "Authorization" ("token" <> token)
1674-- > oAuth2Token token = header "Authorization" ("token" <> token)
1676+-- See also: <https://developer.github.com/v3/oauth#3-use-the-access-token-to-access-the-api>.
711−oAuth2Token
1677+oAuth2Token ::
712− :: ByteString -- ^ Token
1678+ -- | Token
713− -> Option 'Https -- ^ Auth 'Option'
1680+ -- | Auth 'Option'
714−oAuth2Token token = header "Authorization" ("token" <> token)
1684+ (pure . attachHeader "Authorization" ("token " <> token))
716−-- | The 'Option' adds AWS v4 request signature.
1686+-- | A helper to create custom authentication 'Option's. The given
717−
1687+-- 'IO'-enabled request transformation is applied after all other
718−awsAuth
1688+-- modifications when constructing a request. Use wisely.
719− :: ByteString -- ^ AWS access key
1689+--
720− -> ByteString -- ^ AWS secret access key
1690+-- @since 1.1.0
721− -> Option 'Https -- ^ Auth 'Option'
1691+customAuth :: (L.Request -> IO L.Request) -> Option scheme
722−awsAuth accessKey secretKey = withFinalizer
1692+customAuth = Option mempty . pure
723− (AWS.signRequest accessKey secretKey)
725----------------------------------------------------------------------------
1694----------------------------------------------------------------------------
726−-- Request — Optional parameters — Other
1695+-- Request—Optional parameters—Other
728-- | Specify the port to connect to explicitly. Normally, 'Url' you use
1697-- | Specify the port to connect to explicitly. Normally, 'Url' you use
729−-- determines default port, @80@ for HTTP and @443@ for HTTPS, this 'Option'
1698+-- determines the default port: @80@ for HTTP and @443@ for HTTPS. This
730−-- allows to choose arbitrary port overwriting the defaults.
1699+-- 'Option' allows us to choose an arbitrary port overwriting the defaults.
732−port :: Word -> Option scheme
1700+port :: Int -> Option scheme
733port n = withRequest $ \x ->
1701port n = withRequest $ \x ->
734− x { L.port = fromIntegral n }
1702+ x {L.port = n}
736-- | This 'Option' controls whether gzipped data should be decompressed on
1704-- | This 'Option' controls whether gzipped data should be decompressed on
737−-- the fly. By default everything except for @application\/x-tar@ is
1705+-- the fly. By default everything except for @\"application\/x-tar\"@ is
738-- decompressed, i.e. we have:
1706-- decompressed, i.e. we have:
740-- > decompress (/= "application/x-tar")
1708-- > decompress (/= "application/x-tar")
@@ -742,86 +1710,342 @@ port n = withRequest $ \x ->
742-- You can also choose to decompress everything like this:
1710-- You can also choose to decompress everything like this:
744-- > decompress (const True)
1712-- > decompress (const True)
746−decompress
1713+decompress ::
747− :: (ByteString -> Bool) -- ^ Predicate that is given MIME type, it
1714+ -- | Predicate that is given MIME type, it returns 'True' when content
748− -- returns 'True' when content should be decompressed on the fly.
1715+ -- should be decompressed on the fly.
1716+ (ByteString -> Bool) ->
749− -> Option scheme
1717+ Option scheme
750decompress f = withRequest $ \x ->
1718decompress f = withRequest $ \x ->
751− x { L.decompress = f }
1719+ x {L.decompress = f}
753−-- | Specify number of microseconds to wait for response. Default is 30
1721+-- | Specify the number of microseconds to wait for response. The default
754−-- seconds.
1722+-- value is 30 seconds (defined in 'L.ManagerSettings' of connection
755−
1723+-- 'L.Manager').
756−responseTimeout
1724+responseTimeout ::
757− :: Word -- ^ Number of microseconds to wait
1725+ -- | Number of microseconds to wait
758− -> Option scheme
1727+ Option scheme
759responseTimeout n = withRequest $ \x ->
1728responseTimeout n = withRequest $ \x ->
760− x { L.responseTimeout = LI.ResponseTimeoutMicro (fromIntegral n) }
1729+ x {L.responseTimeout = LI.ResponseTimeoutMicro n}
1731+-- | HTTP version to send to the server, the default is HTTP 1.1.
1733+ -- | Major version number
1735+ -- | Minor version number
1738+httpVersion major minor = withRequest $ \x ->
1739+ x {L.requestVersion = Y.HttpVersion major minor}
762−-- | HTTP version to send to server, default is HTTP 1.1.
1741+----------------------------------------------------------------------------
1742+-- Response interpretations
1744+-- | Make a request and ignore the body of the response.
1745+newtype IgnoreResponse = IgnoreResponse (L.Response ())
1748+instance HttpResponse IgnoreResponse where
1749+ type HttpResponseBody IgnoreResponse = ()
1750+ toVanillaResponse (IgnoreResponse r) = r
1751+ getHttpResponse r = return $ IgnoreResponse (void r)
1753+-- | Use this as the fourth argument of 'req' to specify that you want it to
1754+-- ignore the response body.
1755+ignoreResponse :: Proxy IgnoreResponse
1756+ignoreResponse = Proxy
1758+-- | Make a request and interpret the body of the response as JSON. The
1759+-- 'handleHttpException' method of 'MonadHttp' instance corresponding to
1760+-- monad in which you use 'req' will determine what to do in the case when
1761+-- parsing fails (the 'JsonHttpException' constructor will be used).
1762+newtype JsonResponse a = JsonResponse (L.Response a)
1765+instance (FromJSON a) => HttpResponse (JsonResponse a) where
1766+ type HttpResponseBody (JsonResponse a) = a
1767+ toVanillaResponse (JsonResponse r) = r
1768+ getHttpResponse r = do
1769+ chunks <- L.brConsume (L.responseBody r)
1770+ case A.eitherDecode (BL.fromChunks chunks) of
1771+ Left e -> throwIO (JsonHttpException e)
1772+ Right x -> return $ JsonResponse (x <$ r)
1773+ acceptHeader Proxy = Just "application/json"
1775+-- | Use this as the fourth argument of 'req' to specify that you want it to
1776+-- return the 'JsonResponse' interpretation.
1777+jsonResponse :: Proxy (JsonResponse a)
1778+jsonResponse = Proxy
1780+-- | Make a request and interpret the body of the response as a strict
1782+newtype BsResponse = BsResponse (L.Response ByteString)
1785+instance HttpResponse BsResponse where
1786+ type HttpResponseBody BsResponse = ByteString
1787+ toVanillaResponse (BsResponse r) = r
1788+ getHttpResponse r = do
1789+ chunks <- L.brConsume (L.responseBody r)
1790+ return $ BsResponse (B.concat chunks <$ r)
1792+-- | Use this as the fourth argument of 'req' to specify that you want to
1793+-- interpret the response body as a strict 'ByteString'.
1794+bsResponse :: Proxy BsResponse
1797+-- | Make a request and interpret the body of the response as a lazy
1799+newtype LbsResponse = LbsResponse (L.Response BL.ByteString)
1802+instance HttpResponse LbsResponse where
1803+ type HttpResponseBody LbsResponse = BL.ByteString
1804+ toVanillaResponse (LbsResponse r) = r
1805+ getHttpResponse r = do
1806+ chunks <- L.brConsume (L.responseBody r)
1807+ return $ LbsResponse (BL.fromChunks chunks <$ r)
1809+-- | Use this as the fourth argument of 'req' to specify that you want to
1810+-- interpret the response body as a lazy 'BL.ByteString'.
1811+lbsResponse :: Proxy LbsResponse
764−httpVersion
1814+----------------------------------------------------------------------------
765− :: Word -- ^ Major version number
1815+-- Helpers for response interpretations
766− -> Word -- ^ Minor version number
1816+
767− -> Option scheme
1817+-- | Fetch beginning of the response and return it together with a new
768−httpVersion major minor = withRequest $ \x ->
1818+-- @'L.Response' 'L.BodyReader'@ that can be passed to 'getHttpResponse' and
769− x { L.requestVersion =
1819+-- such.
770− Y.HttpVersion (fromIntegral major) (fromIntegral minor) }
1820+grabPreview ::
1821+ -- | How many bytes to fetch
1823+ -- | Response with body reader inside
1824+ L.Response L.BodyReader ->
1825+ -- | Preview 'ByteString' and new response with body reader inside
1826+ IO (ByteString, L.Response L.BodyReader)
1827+grabPreview nbytes r = do
1828+ let br = L.responseBody r
1829+ (target, leftover, done) <- brReadN br nbytes
1830+ nref <- newIORef (0 :: Int)
1832+ n <- readIORef nref
1833+ let incn = modifyIORef' nref (+ 1)
1844+ else return leftover
1847+ then return B.empty
1849+ return (target, r {L.responseBody = br'})
1851+-- | Consume N bytes from 'L.BodyReader', return the target chunk, the
1852+-- leftover (may be empty), and whether we're done consuming the body.
1854+ -- | Body reader to stream from
1856+ -- | How many bytes to consume
1858+ -- | Target chunk, the leftover, whether we're done
1859+ IO (ByteString, ByteString, Bool)
1860+brReadN br n = go 0 id id
1865+ then return (r t, r l, True)
1867+ let (target, leftover) = B.splitAt (n - tlen) chunk
1868+ tlen' = B.length target
1869+ t' = t . (target :)
1870+ l' = l . (leftover :)
1871+ if tlen + tlen' < n
1872+ then go (tlen + tlen') t' l'
1873+ else return (r t', r l', False)
1874+ r f = B.concat (f [])
772----------------------------------------------------------------------------
1876----------------------------------------------------------------------------
1877+-- Inspecting a response
1879+-- | Get the response body.
1881+ (HttpResponse response) =>
1883+ HttpResponseBody response
1884+responseBody = L.responseBody . toVanillaResponse
1886+-- | Get the response status code.
1887+responseStatusCode ::
1888+ (HttpResponse response) =>
1891+responseStatusCode =
1892+ Y.statusCode . L.responseStatus . toVanillaResponse
1894+-- | Get the response status message.
1895+responseStatusMessage ::
1896+ (HttpResponse response) =>
1899+responseStatusMessage =
1900+ Y.statusMessage . L.responseStatus . toVanillaResponse
1902+-- | Lookup a particular header from a response.
1904+ (HttpResponse response) =>
773−-- Response
1905+ -- | Response interpretation
1907+ -- | Header to lookup
1909+ -- | Header value if found
1911+responseHeader r h =
1912+ (lookup (CI.mk h) . L.responseHeaders . toVanillaResponse) r
1914+-- | Get the response 'L.CookieJar'.
1915+responseCookieJar ::
1916+ (HttpResponse response) =>
1919+responseCookieJar = L.responseCookieJar . toVanillaResponse
775−-- Here we need to provide various options how to consume responses.
1921+----------------------------------------------------------------------------
1922+-- Response—Defining your own interpretation
777−class HttpResponse response where
1924+-- $new-response-interpretation
778− getHttpResponse :: L.Manager -> L.Request -> IO response
1925+--
1926+-- To create a new response interpretation you just need to make your data
1927+-- type an instance of the 'HttpResponse' type class.
780−-- helpers to
1929+-- | A type class for response interpretations. It allows us to describe how
1930+-- to consume the response from a @'L.Response' 'L.BodyReader'@ and produce
1931+-- the final result that is to be returned to the user.
1932+class HttpResponse response where
1933+ -- | The associated type is the type of body that can be extracted from an
1934+ -- instance of 'HttpResponse'.
1935+ type HttpResponseBody response :: Type
1937+ -- | The method describes how to get the underlying 'L.Response' record.
1938+ toVanillaResponse :: response -> L.Response (HttpResponseBody response)
1940+ -- | This method describes how to consume response body and, more
1941+ -- generally, obtain @response@ value from @'L.Response' 'L.BodyReader'@.
1943+ -- __Note__: 'L.BodyReader' is nothing but @'IO' 'ByteString'@. You should
1944+ -- call this action repeatedly until it yields the empty 'ByteString'. In
1945+ -- that case streaming of response is finished (which apparently leads to
1946+ -- closing of the connection, so don't call the reader after it has
1947+ -- returned the empty 'ByteString' once) and you can concatenate the
1948+ -- chunks to obtain the final result. (Of course you could as well stream
1949+ -- the contents to a file or do whatever you want.)
1951+ -- __Note__: signature of this function was changed in the version
1954+ -- | Response with body reader inside
1955+ L.Response L.BodyReader ->
1956+ -- | The final result
1959+ -- | The value of @\"Accept\"@ header. This is useful, for example, if a
1960+ -- website supports both @XML@ and @JSON@ responses, and decides what to
1961+ -- reply with based on what @Accept@ headers you have sent.
1963+ -- __Note__: manually specified 'Options' that set the @\"Accept\"@ header
1964+ -- will take precedence.
1967+ acceptHeader :: Proxy response -> Maybe ByteString
1968+ acceptHeader Proxy = Nothing
1970+-- | This instance has been added to make it easier to inspect 'L.Response'
1971+-- using Req's functions like 'responseStatusCode', 'responseStatusMessage',
1975+instance HttpResponse (L.Response ()) where
1976+ type HttpResponseBody (L.Response ()) = ()
1977+ toVanillaResponse = id
1978+ getHttpResponse = return . void
782----------------------------------------------------------------------------
1980----------------------------------------------------------------------------
785-- | The main class for things that are “parts” of 'L.Request' in the sense
1983-- | The main class for things that are “parts” of 'L.Request' in the sense
786-- that if we have a 'L.Request', then we know how to apply an instance of
1984-- that if we have a 'L.Request', then we know how to apply an instance of
787−-- 'RequestComponent' changing\/overwriting something in it. 'Endo' is
1985+-- 'RequestComponent' changing\/overwriting something in it. 'Endo' is a
788−-- endomorphism of functions under composition, it's used to chain different
1986+-- monoid of endomorphisms under composition, it's used to chain different
789−-- request component easier using @('<>')@.
1987+-- request components easier using @('<>')@.
1989+-- __Note__: this type class is not a part of the public API.
791class RequestComponent a where
1990class RequestComponent a where
793 -- | Get a function that takes a 'L.Request' and changes it somehow
1991 -- | Get a function that takes a 'L.Request' and changes it somehow
794− -- returning another 'L.Request'. For example HTTP method instance of
1992+ -- returning another 'L.Request'. For example, the 'HttpMethod' instance
795− -- 'RequestComponent' just overwrites method. The function is wrapped in
1993+ -- of 'RequestComponent' just overwrites method. The function is wrapped
796− -- 'Endo' so it's easier to chain such “modifying applications” together
1994+ -- in 'Endo' so it's easier to chain such “modifying applications”
797− -- building bigger and bigger 'RequestComponent's.
1995+ -- together building bigger and bigger 'RequestComponent's.
799 getRequestMod :: a -> Endo L.Request
1996 getRequestMod :: a -> Endo L.Request
801−-- | This wrapper is only used to attach a type-level tag to given type.
1998+-- | This wrapper is only used to attach a type-level tag to a given type.
802-- This is necessary to define instances of 'RequestComponent' for any thing
1999-- This is necessary to define instances of 'RequestComponent' for any thing
803−-- that implements 'HttpMethod' or 'HttpBody'. Without the tag, GHC is not
2000+-- that implements 'HttpMethod' or 'HttpBody'. Without the tag, GHC can't
804−-- able to see difference between @'HttpMethod' method => 'RequestComponent'
2001+-- see the difference between @'HttpMethod' method => 'RequestComponent'
805-- method@ and @'HttpBody' body => 'RequestComponent' body@ when it decides
2002-- method@ and @'HttpBody' body => 'RequestComponent' body@ when it decides
806−-- which instance to use (i.e. constraints are taken into account later,
2003+-- which instance to use (i.e. the constraints are taken into account later,
807-- when instance is already chosen).
2004-- when instance is already chosen).
2005+newtype Tagged (tag :: Symbol) a = Tagged a
2007+-- | Exceptions that this library throws.
2009+ = -- | A wrapper with an 'L.HttpException' from "Network.HTTP.Client"
2010+ VanillaHttpException L.HttpException
2011+ | -- | A wrapper with Aeson-produced 'String' describing why decoding
2013+ JsonHttpException String
2014+ deriving (Show, Generic)
809−newtype Womb (tag :: Symbol) a = Womb a
2016+instance Exception HttpException
2018+-- | Return 'Just' if the given 'HttpException' is wrapping a http-client's
2019+-- 'L.StatusCodeException'. Otherwise, return 'Nothing'.
2022+isStatusCodeException :: HttpException -> Maybe (L.Response ())
2023+isStatusCodeException
2024+ ( VanillaHttpException
2025+ ( L.HttpExceptionRequest
2027+ (L.StatusCodeException r _)
2030+isStatusCodeException _ = Nothing
811−-- | A simple 'Bool'-like type we only have for better error messages. We
2032+-- | A simple type isomorphic to 'Bool' that we only have for better error
812−-- use it as a kind and its data constructors as type-level tags.
2033+-- messages. We use it as a kind and its data constructors as type-level
814-- See also: 'HttpMethod' and 'HttpBody'.
2036-- See also: 'HttpMethod' and 'HttpBody'.
816data CanHaveBody
2037data CanHaveBody
817− = CanHaveBody -- ^ Indeed can have a body
2038+ = -- | Indeed can have a body
818− | NoBody -- ^ Should not have a body
2040+ | -- | Should not have a body
820−-- | A type-level tag that specifies URL scheme used (and thus if TLS is
2043+-- | A type-level tag that specifies URL scheme used (and thus if HTTPS is
821-- enabled). This is used to force TLS requirement for some authentication
2044-- enabled). This is used to force TLS requirement for some authentication
822-- 'Option's.
2045-- 'Option's.
824data Scheme
2046data Scheme
825− = Http -- ^ HTTP, no TLS
2047+ = -- | HTTP
826− | Https -- ^ HTTPS
2049+ | -- | HTTPS
827− deriving (Eq, Ord, Show, Data, Typeable, Generic)
2051+ deriving (Eq, Ord, Show, Data, Generic, TH.Lift)