@@ -1,903 +1,303 @@
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 #-}
10−
111-- |
122-- Module : Network.HTTP.Req
13−-- Copyright : © 2016–present Mark Karpov
3+-- Copyright : © 2016 Mark Karpov
144-- License : BSD 3 clause
155--
16−-- Maintainer : Mark Karpov <markkarpov92@gmail.com>
6+-- Maintainer : Mark Karpov <markkarpov@openmailbox.org>
177-- Stability : experimental
188-- Portability : portable
199--
20−-- The documentation below is structured in such a way that the most
21−-- important information is presented first: you learn how to do HTTP
22−-- requests, how to embed them in the monad you have, and then it gives you
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.
26−--
27−-- === About the library
28−--
29−-- Req is an HTTP client library that attempts to be easy-to-use, type-safe,
30−-- and expandable.
31−--
32−-- “Easy-to-use” means that the library is designed to be beginner-friendly
33−-- so it's simple to add to your monad stack, intuitive to work with,
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
36−-- clear to beginners, thus certain compromises were made. For example, one
37−-- cannot currently modify 'L.ManagerSettings' of the default manager
38−-- because the library always uses the same implicit global manager for
39−-- simplicity and maximal connection sharing. There is a way to use your own
40−-- manager with different settings, but it requires more typing.
41−--
42−-- “Type-safe” means that the library tries to eliminate certain classes of
43−-- errors. For example, we have correct-by-construction URLs; it is
44−-- guaranteed that the user does not send the request body when using
45−-- methods like GET or OPTIONS, and the amount of implicit assumptions is
46−-- minimized by making the user specify their intentions in an explicit
47−-- form. For example, it's not possible to avoid specifying the body or the
48−-- method of a request. Authentication methods that assume HTTPS force the
49−-- user to use HTTPS at the type level.
50−--
51−-- “Expandable” refers to the ability to create new components without
52−-- having to resort to hacking. For example, it's possible to define your
53−-- own HTTP methods, create new ways to construct the body of a request,
54−-- create new authorization options, perform a request in a different way,
55−-- and create your own methods to parse a response.
56−--
57−-- === Using with other libraries
58−--
59−-- * You won't need the low-level interface of @http-client@ most of the
60−-- time, but when you do, it's better to do a qualified import,
61−-- because @http-client@ has naming conflicts with @req@.
62−-- * For streaming of large request bodies see the companion package
63−-- @req-conduit@: <https://hackage.haskell.org/package/req-conduit>.
64−--
65−-- === Lightweight, no risk solution
66−--
67−-- The library uses the following mature packages under the hood to
68−-- guarantee you the best experience:
69−--
70−-- * <https://hackage.haskell.org/package/http-client>—low level HTTP
10+-- This is an easy-to-use, type-safe, expandable, high-level HTTP library
11+-- that just works without any fooling around.
12+--
13+-- /(A modest intro goes here, click on 'req' to start making requests.)/
14+--
15+-- What does the “easy-to-use” phrase mean? It means that the library is
16+-- designed to be beginner-friendly, so it's simple to add it to your monad
17+-- stack, intuitive to work with, well-documented, and does not get in your
18+-- way. On this path certain compromises were made. For example one cannot
19+-- currently modify 'L.ManagerSettings' of default manager because the
20+-- library always use the same implicit global manager for simplicity and
21+-- maximal connection sharing. There is a way to use your own manager with
22+-- different settings, but it requires a bit more typing. Doing HTTP
23+-- requests is a common task and Haskell library for this should be very
24+-- approachable and clear to beginners.
25+--
26+-- “Type-safe” means that the library is protective and eliminates certain
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
29+-- guaranteed that user does not send request body when using methods like
30+-- 'GET' or 'DELETE', amount of implicit assumptions is minimized by making
31+-- user specify his\/her intentions in explicit form (for example it's not
32+-- possible to avoid specifying body or method of a request). The library
33+-- carefully hides underlying types from lower-level @http-client@ package
34+-- because it's not type safe enough (for example 'L.Request' is an instance
35+-- of 'Data.String.IsString' and if it's malformed, it will blow up at
36+-- run-time).
37+--
38+-- “Expandable” refers to the ability of the library to be expanded without
39+-- ugly hacking. For example it's possible to define your own HTTP methods,
40+-- new ways to construct body of request, new authorization options, new
41+-- ways to actually perform request and how to represent\/parse its
42+-- response. As user extends the library to satisfy his\/her special needs,
43+-- the new solutions work just like built-ins. That said, all common cases
44+-- are covered by the library out-of-the-box.
45+--
46+-- “High-level” means that there are less details to worry about. The
47+-- library is a result of my experiences as a Haskell consultant, working
48+-- for several clients who have very different projects and so the library
49+-- adapts easily to any particular style of writing Haskell applications.
50+-- For example some people prefer throwing exceptions, while others are
51+-- concerned with purity: just define 'handleHttpException' accordingly when
52+-- making your monad instance of 'MonadHttp' and it will play seamlessly.
53+-- Finally, the library cuts boilerplate considerably and helps write
54+-- concise, easy to read code, thanks to its minimal and uniform API.
55+--
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.
62+--
63+-- The library uses the following well-known and mature packages under the
64+-- hood to guarantee you best experience without bugs or other funny
65+-- business:
66+--
67+-- * <https://hackage.haskell.org/package/http-client> — low level HTTP
7168-- client used everywhere in Haskell.
72−-- * <https://hackage.haskell.org/package/http-client-tls>—TLS (HTTPS)
69+-- * <https://hackage.haskell.org/package/http-client-tls> — TLS (HTTPS)
7370-- support for @http-client@.
74−--
75−-- It's important to note that since we leverage well-known libraries that
76−-- the whole Haskell ecosystem uses, there is no risk in using @req@. The
77−-- machinery for performing requests is the same as with @http-conduit@ and
78−-- @wreq@. The only difference is the API.
71+-- * <https://hackage.haskell.org/package/http-conduit> — conduit
72+-- interface to @http-client@.
73+--
74+-- You won't need low-level interface of @http-client@ most of the time, but
75+-- when you do, it's better import it qualified because it has naming
76+-- conflicts with @req@.
77+
78+{-# LANGUAGE DataKinds #-}
79+{-# LANGUAGE DeriveDataTypeable #-}
80+{-# LANGUAGE DeriveGeneric #-}
81+{-# LANGUAGE FlexibleInstances #-}
82+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
83+{-# LANGUAGE KindSignatures #-}
84+{-# LANGUAGE RecordWildCards #-}
85+{-# LANGUAGE ScopedTypeVariables #-}
86+{-# LANGUAGE TypeFamilies #-}
87+{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
88+
7989module Network.HTTP.Req
8090 ( -- * Making a request
8191 -- $making-a-request
82− req,
83− reqBr,
84− reqCb,
85− req',
86− withReqManager,
87−
88− -- * Embedding requests in your monad
92+ req
93+ -- * Embedding requests into your monad
8994 -- $embedding-requests
90− MonadHttp (..),
91− HttpConfig (..),
92− defaultHttpConfig,
93− Req,
94− runReq,
95−
95+ , MonadHttp (..)
96+ , HttpConfig (..)
9697 -- * Request
97−
98− -- ** Method
99− -- $method
100− GET (..),
101− POST (..),
102− HEAD (..),
103− PUT (..),
104− DELETE (..),
105− TRACE (..),
106− CONNECT (..),
107− OPTIONS (..),
108− PATCH (..),
109− HttpMethod (..),
110−
98+ -- ** Methods
99+ -- $request-methods
100+ , GET (..)
101+ , POST (..)
102+ , HEAD (..)
103+ , PUT (..)
104+ , DELETE (..)
105+ , TRACE (..)
106+ , CONNECT (..)
107+ , OPTIONS (..)
108+ , PATCH (..)
109+ , HttpMethod (..)
111110 -- ** URL
112− -- $url
113− Url,
114− http,
115− https,
116− (/~),
117− (/:),
118− useHttpURI,
119− useHttpsURI,
120− useURI,
121− urlQ,
122− renderUrl,
123−
111+ , Url
112+ , http
113+ , https
114+ , (/:)
124115 -- ** Body
125− -- $body
126− NoReqBody (..),
127− ReqBodyJson (..),
128− ReqBodyFile (..),
129− ReqBodyBs (..),
130− ReqBodyLbs (..),
131− ReqBodyUrlEnc (..),
132− FormUrlEncodedParam,
133− ReqBodyMultipart,
134− reqBodyMultipart,
135− HttpBody (..),
136− ProvidesBody,
137− HttpBodyAllowed,
138−
116+ , HttpBody (..) -- TODO more stuff here
139117 -- ** Optional parameters
140− -- $optional-parameters
141− Option,
142−
118+ -- $request-optional-parameters
119+ , Option
143120 -- *** Query parameters
144− -- $query-parameters
145− (=:),
146− queryFlag,
147− formToQuery,
148− QueryParam (..),
149−
121+ , (=:)
122+ , queryFlag
123+ , QueryParam (..)
150124 -- *** Headers
151− header,
152− attachHeader,
153− headerRedacted,
154−
125+ , header
155126 -- *** Cookies
156− -- $cookies
157− cookieJar,
158−
159127 -- *** Authentication
160− -- $authentication
161− basicAuth,
162− basicAuthUnsafe,
163− basicProxyAuth,
164− oAuth1,
165− oAuth2Bearer,
166− oAuth2Token,
167− customAuth,
168−
169128 -- *** Other
170− port,
171− decompress,
172− responseTimeout,
173− httpVersion,
174−
129+ , port
175130 -- * Response
176−
177− -- ** Response interpretations
178− IgnoreResponse,
179− ignoreResponse,
180− JsonResponse,
181− jsonResponse,
182− BsResponse,
183− bsResponse,
184− LbsResponse,
185− lbsResponse,
186−
187− -- ** Inspecting a response
188− responseBody,
189− responseStatusCode,
190− responseStatusMessage,
191− responseHeader,
192− responseCookieJar,
193−
194− -- ** Defining your own interpretation
195− -- $new-response-interpretation
196− HttpResponse (..),
197−
131+ , HttpResponse (..)
198132 -- * Other
199− HttpException (..),
200− isStatusCodeException,
201− CanHaveBody (..),
202− Scheme (..),
203− )
133+ , CanHaveBody (..) )
204134where
205135
206−import Blaze.ByteString.Builder qualified as BB
207−import Control.Applicative
208136import Control.Arrow (first, second)
209−import Control.Exception hiding (Handler (..), TypeError)
210−import Control.Monad (guard, void, (>=>))
211−import Control.Monad.Base
212−import Control.Monad.Catch (Handler (..), MonadCatch, MonadMask, MonadThrow)
137+import Control.Exception (try)
213138import 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
231−import Control.Retry
232−import Data.Aeson (FromJSON (..), ToJSON (..))
233−import Data.Aeson qualified as A
234−import 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
139+import Data.Aeson
140+import Data.ByteString
238141import Data.Data (Data)
239−import Data.Default.Class (def)
240−import Data.Function (on)
142+import Data.Default.Class
241143import Data.IORef
242−import Data.Kind (Constraint, Type)
243−import Data.List (foldl', nubBy)
244144import Data.List.NonEmpty (NonEmpty (..))
245−import Data.List.NonEmpty qualified as NE
246−import Data.Maybe (fromMaybe)
247145import Data.Proxy
248−import Data.Semigroup (Endo (..))
249−import Data.Set qualified as S
146+import Data.Semigroup hiding (Option)
250147import Data.Text (Text)
251−import Data.Text qualified as T
252−import Data.Text.Encoding qualified as T
253−import Data.Typeable (Typeable, cast)
148+import Data.Typeable (Typeable)
254149import GHC.Generics
255150import 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
265151import System.IO.Unsafe (unsafePerformIO)
266−import Text.URI (URI)
267−import Text.URI qualified as URI
268−import Text.URI.QQ qualified as QQ
269−import Web.Authenticate.OAuth qualified as OAuth
270−import Web.FormUrlEncoded (FromForm (..), ToForm (..))
271−import Web.FormUrlEncoded qualified as Form
272−import Web.HttpApiData (ToHttpApiData (..))
152+import qualified Data.Binary.Builder as R
153+import qualified Data.ByteString as B
154+import qualified Data.ByteString.Lazy as BL
155+import qualified Data.CaseInsensitive as CI
156+import qualified Data.List.NonEmpty as NE
157+import qualified Data.Text.Encoding as T
158+import qualified Network.Connection as NC
159+import qualified Network.HTTP.Client as L
160+import qualified Network.HTTP.Client.Internal as LI
161+import qualified Network.HTTP.Client.TLS as L
162+import qualified Network.HTTP.Types as Y
273163
274164----------------------------------------------------------------------------
275165-- Making a request
276166
277167-- $making-a-request
278168--
279−-- To make an HTTP request you normally need only one function: 'req'.
280−
281−-- | Make an HTTP request. The function takes 5 arguments, 4 of which
282−-- specify required parameters and the final 'Option' argument is a
283−-- collection of optional parameters.
284−--
285−-- Let's go through all the arguments first: @req method url body response
286−-- options@.
287−--
288−-- @method@ is an HTTP method such as 'GET' or 'POST'. The documentation has
289−-- a dedicated section about HTTP methods below.
290−--
291−-- @url@ is a 'Url' that describes location of resource you want to interact
292−-- with.
293−--
294−-- @body@ is a body option such as 'NoReqBody' or 'ReqBodyJson'. The
295−-- tutorial has a section about HTTP bodies, but usage is very
296−-- straightforward and should be clear from the examples.
297−--
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:
300−--
301−-- * 'ignoreResponse'
302−-- * 'jsonResponse'
303−-- * 'bsResponse' (to get a strict 'ByteString')
304−-- * 'lbsResponse' (to get a lazy 'BL.ByteString')
305−--
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'.
311−--
312−-- __Note__ that if you use 'req' to do all your requests, connection
313−-- sharing and reuse is done for you automatically.
314−--
315−-- See the examples below to get on the speed quickly.
316−--
317−-- ==== __Examples__
318−--
319−-- First, this is a piece of boilerplate that should be in place before you
320−-- try the examples:
321−--
322−-- > {-# LANGUAGE DeriveGeneric #-}
323−-- > {-# LANGUAGE OverloadedStrings #-}
324−-- >
325−-- > module Main (main) where
326−-- >
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
337−--
338−-- We will be making requests against the <https://httpbin.org> service.
339−--
340−-- Make a GET request, grab 5 random bytes:
341−--
342−-- > main :: IO ()
343−-- > main = runReq defaultHttpConfig $ do
344−-- > let n :: Int
345−-- > n = 5
346−-- > bs <- req GET (https "httpbin.org" /: "bytes" /~ n) NoReqBody bsResponse mempty
347−-- > liftIO $ B.putStrLn (responseBody bs)
348−--
349−-- The same, but now we use a query parameter named @\"seed\"@ to control
350−-- seed of the generator:
351−--
352−-- > main :: IO ()
353−-- > main = runReq defaultHttpConfig $ do
354−-- > let n, seed :: Int
355−-- > n = 5
356−-- > seed = 100
357−-- > bs <- req GET (https "httpbin.org" /: "bytes" /~ n) NoReqBody bsResponse $
358−-- > "seed" =: seed
359−-- > liftIO $ B.putStrLn (responseBody bs)
360−--
361−-- POST JSON data and get some info about the POST request:
362−--
363−-- > data MyData = MyData
364−-- > { size :: Int
365−-- > , color :: Text
366−-- > } deriving (Show, Generic)
367−-- >
368−-- > instance ToJSON MyData
369−-- > instance FromJSON MyData
370−-- >
371−-- > main :: IO ()
372−-- > main = runReq defaultHttpConfig $ do
373−-- > let myData = MyData
374−-- > { size = 6
375−-- > , color = "Green" }
376−-- > v <- req POST (https "httpbin.org" /: "post") (ReqBodyJson myData) jsonResponse mempty
377−-- > liftIO $ print (responseBody v :: Value)
378−--
379−-- Sending URL-encoded body:
380−--
381−-- > main :: IO ()
382−-- > main = runReq defaultHttpConfig $ do
383−-- > let params =
384−-- > "foo" =: ("bar" :: Text) <>
385−-- > queryFlag "baz"
386−-- > response <- req POST (https "httpbin.org" /: "post") (ReqBodyUrlEnc params) jsonResponse mempty
387−-- > liftIO $ print (responseBody response :: Value)
388−--
389−-- Using various optional parameters and URL that is not known in advance:
390−--
391−-- > main :: IO ()
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)
404−req ::
405− ( MonadHttp m,
406− HttpMethod method,
407− HttpBody body,
408− HttpResponse response,
409− HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
410− ) =>
411− -- | HTTP method
412− method ->
413− -- | 'Url'—location of resource
414− Url scheme ->
415− -- | Body of the request
416− body ->
417− -- | A hint how to interpret response
418− Proxy response ->
419− -- | Collection of optional parameters
420− Option scheme ->
421− -- | Response
422− m response
423−req method url body responseProxy options =
424− reqCb method url body responseProxy options pure
425−
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.
429−--
430−-- @since 1.0.0
431−reqBr ::
432− ( MonadHttp m,
433− HttpMethod method,
434− HttpBody body,
435− HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
436− ) =>
437− -- | HTTP method
438− method ->
439− -- | 'Url'—location of resource
440− Url scheme ->
441− -- | Body of the request
442− body ->
443− -- | Collection of optional parameters
444− Option scheme ->
445− -- | How to consume response
446− (L.Response L.BodyReader -> IO a) ->
447− -- | Result
448− m a
449−reqBr method url body options consume =
450− req' method url body options (reqHandler consume)
451−
452−-- | A version of 'req' that takes a callback to modify the 'L.Request', but
453−-- otherwise performs the request identically.
454−--
455−-- @since 3.7.0
456−reqCb ::
457− ( MonadHttp m,
458− HttpMethod method,
459− HttpBody body,
460− HttpResponse response,
461− HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
462− ) =>
463− -- | HTTP method
464− method ->
465− -- | 'Url'—location of resource
466− Url scheme ->
467− -- | Body of the request
468− body ->
469− -- | A hint how to interpret response
470− Proxy response ->
471− -- | Collection of optional parameters
472− Option scheme ->
473− -- | Callback to modify the request
474− (L.Request -> m L.Request) ->
475− -- | Response
476− m response
477−reqCb method url body responseProxy options adjustRequest =
478− req' method url body (options <> extraOptions) $ \request manager -> do
479− request' <- adjustRequest request
480− reqHandler getHttpResponse request' manager
481− where
482− extraOptions =
483− case acceptHeader responseProxy of
484− Nothing -> mempty
485− Just accept -> header "Accept" accept
486−
487−-- | The default handler function that the higher-level request functions
488−-- pass to 'req''. Internal function.
489−--
490−-- @since 3.7.0
491−reqHandler ::
492− (MonadHttp m) =>
493− -- | How to get final result from a 'L.Response'
494− (L.Response L.BodyReader -> IO b) ->
495− -- | 'L.Request' to perform
496− L.Request ->
497− -- | 'L.Manager' to use
498− L.Manager ->
499− m b
500−reqHandler consume request manager = do
501− HttpConfig {..} <- getHttpConfig
502− let wrapVanilla = handle (throwIO . VanillaHttpException)
503− wrapExc = handle (throwIO . LI.toHttpException request)
504− withRRef =
505− bracket
506− (newIORef Nothing)
507− (readIORef >=> mapM_ L.responseClose)
508− (liftIO . try . wrapVanilla . wrapExc)
509− ( withRRef $ \rref -> do
510− let openResponse = mask_ $ do
511− r <- readIORef rref
512− mapM_ L.responseClose r
513− r' <- L.responseOpen request manager
514− writeIORef rref (Just r')
515− return r'
516− exceptionRetryPolicies =
517− skipAsyncExceptions
518− ++ [ \retryStatus -> Handler $ \e ->
519− return $ httpConfigRetryJudgeException retryStatus e
520− ]
521− r <-
522− retrying
523− httpConfigRetryPolicy
524− (\retryStatus r -> return $ httpConfigRetryJudge retryStatus r)
525− ( const
526− ( recovering
527− httpConfigRetryPolicy
528− exceptionRetryPolicies
529− (const openResponse)
530− )
531− )
532− (preview, r') <- grabPreview httpConfigBodyPreviewLength r
533− mapM_ LI.throwHttp (httpConfigCheckResponse request r' preview)
534− consume r'
535− )
169+-- To make an HTTP request you need only one function: 'req'.
170+
171+-- | Make an HTTP request.
172+--
173+-- TODO Finish docs of this function when the package is more developed.
174+
175+req
176+ :: forall m method body response.
177+ ( MonadHttp m
178+ , HttpMethod method
179+ , HttpBody body
180+ , HttpResponse response
181+ , AllowsBody method ~ ProvidesBody body )
182+ => method -- ^ HTTP method
183+ -> Url -- ^ 'Url' — location of resource
184+ -> body -- ^ Body of the request
185+ -> Option -- ^ Collection of optional parameters
186+ -> m response -- ^ Response
187+req method url body options = do
188+ config <- getHttpConfig
189+ manager <- liftIO (readIORef globalManager)
190+ let request = flip appEndo L.defaultRequest $
191+ -- NOTE Order of 'mappend's matters, here method is overwritten
192+ -- first and 'config' takes its effect last. In particular, this
193+ -- means that 'options' can overwrite things set by 'url' and
194+ -- 'body', which is useful for setting port number, "Content-Type"
195+ -- header, etc.
196+ getRequestMod config <>
197+ getRequestMod options <>
198+ getRequestMod (Womb body :: Womb "body" body) <>
199+ getRequestMod url <>
200+ getRequestMod (Womb method :: Womb "method" method)
201+ liftIO (try $ getHttpResponse manager request)
536202 >>= either handleHttpException return
537203
538−-- | Mostly like 'req' with respect to its arguments, but accepts a callback
539−-- that allows to perform a request in arbitrary fashion.
540−--
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.
544−--
545−-- @since 0.3.0
546−req' ::
547− forall m method body scheme a.
548− ( MonadHttp m,
549− HttpMethod method,
550− HttpBody body,
551− HttpBodyAllowed (AllowsBody method) (ProvidesBody body)
552− ) =>
553− -- | HTTP method
554− method ->
555− -- | 'Url'—location of resource
556− Url scheme ->
557− -- | Body of the request
558− body ->
559− -- | Collection of optional parameters
560− Option scheme ->
561− -- | How to perform request
562− (L.Request -> L.Manager -> m a) ->
563− -- | Result
564− 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)}
571− request' =
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.
578− nubHeaders
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)
586−
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
592−
593−-- | The global 'L.Manager' that 'req' uses. Here we just go with the
594−-- default settings, so users don't need to deal with this manager stuff at
595−-- all, but when we create a request, instance 'HttpConfig' can affect the
596−-- default settings via 'getHttpConfig'.
204+-- | Global 'L.Manager' that 'req' uses. Here we just go with the default
205+-- settings, so users don't need to deal with this manager stuff at all, but
206+-- when we create a request, instance 'HttpConfig' can affect the default
207+-- settings via 'getHttpConfig'.
597208--
598209-- A note about safety, in case 'unsafePerformIO' looks suspicious to you.
599210-- The value of 'globalManager' is named and lives on top level. This means
600−-- it will be shared, i.e. computed only once on the first use of the
601−-- manager. From that moment on the 'IORef' will be just reused—exactly the
602−-- behavior we want here in order to maximize connection sharing. GHC could
603−-- spoil the plan by inlining the definition, hence the @NOINLINE@ pragma.
604−globalManager :: L.Manager
211+-- it will be shared, i.e. computed only once on first use of manager. From
212+-- that moment on the 'IORef' will be just reused — exactly the behaviour we
213+-- want here in order to maximize connection sharing. GHC could spoil the
214+-- plan by inlining the definition, hence the @NOINLINE@ pragma.
215+
216+globalManager :: IORef L.Manager
605217globalManager = unsafePerformIO $ do
606218 context <- NC.initConnectionContext
607− let settings =
608− L.mkManagerSettingsContext
609− (Just context)
610− def
611− Nothing
219+ let settings = L.mkManagerSettingsContext (Just context) def Nothing
612220 manager <- L.newManager settings
613− return manager
221+ newIORef manager
614222{-# NOINLINE globalManager #-}
615223
616224----------------------------------------------------------------------------
617−-- Embedding requests in your monad
225+-- Embedding requests into your monad
618226
619227-- $embedding-requests
620228--
621229-- To use 'req' in your monad, all you need to do is to make the monad an
622−-- instance of the 'MonadHttp' type class.
623−--
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).
230+-- instance of the 'MonadHttp' type class, which see.
629231
630232-- | A type class for monads that support performing HTTP requests.
631233-- Typically, you only need to define the 'handleHttpException' method
632234-- unless you want to tweak 'HttpConfig'.
633−class (MonadIO m) => MonadHttp m where
634− -- | This method describes how to deal with 'HttpException' that was
235+
236+class MonadIO m => MonadHttp m where
237+
238+ {-# MINIMAL handleHttpException #-}
239+
240+ -- | This method describes how to deal with 'L.HttpException' that was
635241 -- caught by the library. One option is to re-throw it if you are OK with
636242 -- exceptions, but if you prefer working with something like
637− -- 'Control.Monad.Except.MonadError', this is the right place to pass it to
638− -- 'Control.Monad.Except.throwError'.
639− handleHttpException :: HttpException -> m a
640−
641− -- | Return the 'HttpConfig' to be used when performing HTTP requests.
642− -- Default implementation returns its 'def' value, which is described in
643− -- the documentation for the type. Common usage pattern with manually
644− -- defined 'getHttpConfig' is to return some hard-coded value, or a value
645− -- extracted from 'Control.Monad.Reader.MonadReader' if a more flexible
646− -- approach to configuration is desirable.
243+ -- 'Control.Monad.Error.MonadError', this is the right place to pass it to
244+ -- 'Control.Monad.Error.throwError' for example.
245+
246+ handleHttpException :: L.HttpException -> m a
247+
248+ -- | Return 'HttpConfig' to be used when performing HTTP requests. Default
249+ -- implementation returns its 'def' value, which is described in the
250+ -- documentation for the type. Common usage pattern with manually defined
251+ -- 'getHttpConfig' is to return some hard-coded value, or value extracted
252+ -- from 'Control.Monad.Reader.MonadReader' if a more flexible approach to
253+ -- configuration is desirable.
254+
647255 getHttpConfig :: m HttpConfig
648− getHttpConfig = return defaultHttpConfig
256+ getHttpConfig = return def
257+
258+-- | 'HttpConfig' contains general and default settings to be used when
259+-- making HTTP requests.
649260
650−-- | 'HttpConfig' contains settings to be used when making HTTP requests.
651261data HttpConfig = HttpConfig
652− { -- | Proxy to use. By default values of @HTTP_PROXY@ and @HTTPS_PROXY@
262+ { httpConfigProxy :: !(Maybe L.Proxy)
263+ -- ^ Proxy to use. By default values of @HTTP_PROXY@ and @HTTPS_PROXY@
653264 -- environment variables are respected, this setting overwrites them.
654265 -- Default value: 'Nothing'.
655− httpConfigProxy :: Maybe L.Proxy,
656− -- | How many redirects to follow when getting a resource. Default
266+ , httpConfigRedirectCount :: !Word
267+ -- ^ How many redirects to follow when getting a resource. Default
657268 -- value: 10.
658− httpConfigRedirectCount :: Int,
659− -- | Alternative 'L.Manager' to use. 'Nothing' (default value) means
660− -- that the default implicit manager will be used (that's what you want
661− -- in 99% of cases).
662− httpConfigAltManager :: Maybe L.Manager,
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
666− -- bytes). This is used for throwing exceptions on non-success status
667− -- codes by default (set to @\\_ _ _ -> Nothing@ if this behavior is not
668− -- desirable).
669− --
670− -- When the value this function returns is 'Nothing', nothing will
671− -- happen. When it there is 'L.HttpExceptionContent' inside 'Just', it
672− -- will be thrown.
673− --
674− -- Throwing is better then just returning a request with non-2xx status
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
678− -- something exceptional). The thrown exception is caught by the library
679− -- though and is available in 'handleHttpException'.
680− --
681− -- __Note__: signature of this function was changed in the version
682− -- /1.0.0/.
683− --
684− -- @since 0.3.0
685− httpConfigCheckResponse ::
686− forall b.
687− L.Request ->
688− L.Response b ->
689− ByteString ->
690− Maybe L.HttpExceptionContent,
691− -- | The retry policy to use for request retrying. By default 'def' is
692− -- used (see 'RetryPolicyM').
693− --
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/.
696− --
697− -- @since 0.3.0
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.
701− --
702− -- __Note__: signature of this function was changed in the version
703− -- /1.0.0/.
704− --
705− -- @since 0.3.0
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
710− -- /3.8.0/).
711− --
712− -- @since 3.4.0
713− httpConfigRetryJudgeException :: RetryStatus -> SomeException -> Bool,
714− -- | Max length of preview fragment of response body.
715− --
716− -- @since 3.6.0
717− httpConfigBodyPreviewLength :: forall a. (Num a) => a
718− }
719−
720−-- | The default value of 'HttpConfig'.
721−--
722−-- @since 2.0.0
723−defaultHttpConfig :: HttpConfig
724−defaultHttpConfig =
725− HttpConfig
726− { httpConfigProxy = Nothing,
727− httpConfigRedirectCount = 10,
728− httpConfigAltManager = Nothing,
729− httpConfigCheckResponse = \_ response preview ->
730− let scode = statusCode response
731− in if 200 <= scode && scode < 300
732− then Nothing
733− else Just (L.StatusCodeException (void response) preview),
734− httpConfigRetryPolicy = retryPolicyDefault,
735− httpConfigRetryJudge = \_ response ->
736− statusCode 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
742− ],
743− httpConfigRetryJudgeException = \_ e ->
744− case fromException e of
745− Just (L.HttpExceptionRequest _ c) ->
746− case c of
747− L.ResponseTimeout -> True
748− L.ConnectionTimeout -> True
749− _ -> False
750− _ -> False,
751− httpConfigBodyPreviewLength = 1024
752− }
753− where
754− statusCode = Y.statusCode . L.responseStatus
269+ , httpConfigAltManager :: !(Maybe L.Manager)
270+ -- ^ Alternative 'L.Manager' to use. 'Nothing' (default value) means
271+ -- that default implicit manager will be used (that's what you want in
272+ -- 99% of cases).
273+ } deriving Typeable
274+
275+instance Default HttpConfig where
276+ def = HttpConfig
277+ { httpConfigProxy = Nothing
278+ , httpConfigRedirectCount = 10
279+ , httpConfigAltManager = Nothing }
755280
756281instance RequestComponent HttpConfig where
757282 getRequestMod HttpConfig {..} = Endo $ \x ->
758− x
759− { L.proxy = httpConfigProxy,
760− L.redirectCount = httpConfigRedirectCount,
761− LI.requestManagerOverride = httpConfigAltManager
762− }
763−
764−-- | A monad that allows us to run 'req' in any 'IO'-enabled monad without
765−-- having to define new instances.
766−--
767−-- @since 0.4.0
768−newtype Req a = Req (ReaderT HttpConfig IO a)
769− deriving
770− ( Functor,
771− Applicative,
772− Monad,
773− MonadIO,
774− MonadUnliftIO
775− )
776−
777−-- | @since 3.7.0
778−deriving instance MonadThrow Req
779−
780−-- | @since 3.7.0
781−deriving instance MonadCatch Req
782−
783−-- | @since 3.7.0
784−deriving instance MonadMask Req
785−
786−instance MonadBase IO Req where
787− liftBase = liftIO
788−
789−instance MonadBaseControl IO Req where
790− type StM Req a = a
791− liftBaseWith f = Req . ReaderT $ \r -> f (runReq r)
792− {-# INLINEABLE liftBaseWith #-}
793− restoreM = Req . ReaderT . const . return
794− {-# INLINEABLE restoreM #-}
795−
796−instance MonadHttp Req where
797− handleHttpException = Req . lift . throwIO
798− getHttpConfig = Req ask
799−
800−-- | @since 3.10.0
801−instance (MonadHttp m, Monoid w) => MonadHttp (AccumT w m) where
802− handleHttpException = lift . handleHttpException
803− getHttpConfig = lift getHttpConfig
804−
805−-- | @since 3.10.0
806−instance (MonadHttp m) => MonadHttp (ContT r m) where
807− handleHttpException = lift . handleHttpException
808− getHttpConfig = lift getHttpConfig
809−
810−-- | @since 3.10.0
811−instance (MonadHttp m) => MonadHttp (ExceptT e m) where
812− handleHttpException = lift . handleHttpException
813− getHttpConfig = lift getHttpConfig
814−
815−-- | @since 3.10.0
816−instance (MonadHttp m) => MonadHttp (IdentityT m) where
817− handleHttpException = lift . handleHttpException
818− getHttpConfig = lift getHttpConfig
819−
820−-- | @since 3.10.0
821−instance (MonadHttp m) => MonadHttp (MaybeT m) where
822− handleHttpException = lift . handleHttpException
823− getHttpConfig = lift getHttpConfig
824−
825−-- | @since 3.10.0
826−instance (MonadHttp m) => MonadHttp (ReaderT r m) where
827− handleHttpException = lift . handleHttpException
828− getHttpConfig = lift getHttpConfig
829−
830−-- | @since 3.10.0
831−instance (MonadHttp m, Monoid w) => MonadHttp (RWS.CPS.RWST r w s m) where
832− handleHttpException = lift . handleHttpException
833− getHttpConfig = lift getHttpConfig
834−
835−-- | @since 3.10.0
836−instance (MonadHttp m, Monoid w) => MonadHttp (RWS.Lazy.RWST r w s m) where
837− handleHttpException = lift . handleHttpException
838− getHttpConfig = lift getHttpConfig
839−
840−-- | @since 3.10.0
841−instance (MonadHttp m, Monoid w) => MonadHttp (RWS.Strict.RWST r w s m) where
842− handleHttpException = lift . handleHttpException
843− getHttpConfig = lift getHttpConfig
844−
845−-- | @since 3.10.0
846−instance (MonadHttp m) => MonadHttp (SelectT r m) where
847− handleHttpException = lift . handleHttpException
848− getHttpConfig = lift getHttpConfig
849−
850−-- | @since 3.10.0
851−instance (MonadHttp m) => MonadHttp (State.Lazy.StateT s m) where
852− handleHttpException = lift . handleHttpException
853− getHttpConfig = lift getHttpConfig
854−
855−-- | @since 3.10.0
856−instance (MonadHttp m) => MonadHttp (State.Strict.StateT s m) where
857− handleHttpException = lift . handleHttpException
858− getHttpConfig = lift getHttpConfig
859−
860−-- | @since 3.10.0
861−instance (MonadHttp m, Monoid w) => MonadHttp (Writer.CPS.WriterT w m) where
862− handleHttpException = lift . handleHttpException
863− getHttpConfig = lift getHttpConfig
864−
865−-- | @since 3.10.0
866−instance (MonadHttp m, Monoid w) => MonadHttp (Writer.Lazy.WriterT w m) where
867− handleHttpException = lift . handleHttpException
868− getHttpConfig = lift getHttpConfig
869−
870−-- | @since 3.10.0
871−instance (MonadHttp m, Monoid w) => MonadHttp (Writer.Strict.WriterT w m) where
872− handleHttpException = lift . handleHttpException
873− getHttpConfig = lift getHttpConfig
874−
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.
877−--
878−-- @since 0.4.0
879−runReq ::
880− (MonadIO m) =>
881− -- | 'HttpConfig' to use
882− HttpConfig ->
883− -- | Computation to run
884− Req a ->
885− m a
886−runReq config (Req m) = liftIO (runReaderT m config)
283+ x { L.proxy = httpConfigProxy
284+ , L.redirectCount = fromIntegral httpConfigRedirectCount
285+ , LI.requestManagerOverride = httpConfigAltManager }
887286
888287----------------------------------------------------------------------------
889−-- Request—Method
288+-- Request — Methods
890289
891−-- $method
290+-- $request-methods
892291--
893−-- The package supports all methods as defined by RFC 2616, and 'PATCH'
894−-- which is defined by RFC 5789—that should be enough to talk to RESTful
895−-- APIs. In some cases, however, you may want to add more methods (e.g. you
292+-- The package provides all methods as defined by RFC 2616, and 'PATCH'
293+-- which is defined by RFC 5789 — that should be enough to talk to RESTful
294+-- APIs. In some cases however, you may want to add more methods (e.g. you
896295-- work with WebDAV <https://en.wikipedia.org/wiki/WebDAV>); no need to
897296-- compromise on type safety and hack, it only takes a couple of seconds to
898297-- define a new method that will works seamlessly, see 'HttpMethod'.
899298
900299-- | 'GET' method.
300+
901301data GET = GET
902302
903303instance HttpMethod GET where
@@ -905,6 +305,7 @@ instance HttpMethod GET where
905305 httpMethodName Proxy = Y.methodGet
906306
907307-- | 'POST' method.
308+
908309data POST = POST
909310
910311instance HttpMethod POST where
@@ -912,6 +313,7 @@ instance HttpMethod POST where
912313 httpMethodName Proxy = Y.methodPost
913314
914315-- | 'HEAD' method.
316+
915317data HEAD = HEAD
916318
917319instance HttpMethod HEAD where
@@ -919,24 +321,23 @@ instance HttpMethod HEAD where
919321 httpMethodName Proxy = Y.methodHead
920322
921323-- | 'PUT' method.
324+
922325data PUT = PUT
923326
924327instance HttpMethod PUT where
925328 type AllowsBody PUT = 'CanHaveBody
926329 httpMethodName Proxy = Y.methodPut
927330
928−-- | 'DELETE' method. RFC 7231 allows a payload in DELETE but without
929−-- semantics.
930−--
931−-- __Note__: before version /3.4.0/ this method did not allow request
932−-- bodies.
331+-- | 'DELETE' method.
332+
933333data DELETE = DELETE
934334
935335instance HttpMethod DELETE where
936− type AllowsBody DELETE = 'CanHaveBody
336+ type AllowsBody DELETE = 'NoBody
937337 httpMethodName Proxy = Y.methodDelete
938338
939339-- | 'TRACE' method.
340+
940341data TRACE = TRACE
941342
942343instance HttpMethod TRACE where
@@ -944,6 +345,7 @@ instance HttpMethod TRACE where
944345 httpMethodName Proxy = Y.methodTrace
945346
946347-- | 'CONNECT' method.
348+
947349data CONNECT = CONNECT
948350
949351instance HttpMethod CONNECT where
@@ -951,6 +353,7 @@ instance HttpMethod CONNECT where
951353 httpMethodName Proxy = Y.methodConnect
952354
953355-- | 'OPTIONS' method.
356+
954357data OPTIONS = OPTIONS
955358
956359instance HttpMethod OPTIONS where
@@ -958,6 +361,7 @@ instance HttpMethod OPTIONS where
958361 httpMethodName Proxy = Y.methodOptions
959362
960363-- | 'PATCH' method.
364+
961365data PATCH = PATCH
962366
963367instance HttpMethod PATCH where
@@ -965,43 +369,41 @@ instance HttpMethod PATCH where
965369 httpMethodName Proxy = Y.methodPatch
966370
967371-- | A type class for types that can be used as an HTTP method. To define a
968−-- non-standard method, follow this example that defines @COPY@:
372+-- non-standard method, follow this example that defines COPY:
969373--
970374-- > data COPY = COPY
971375-- >
972376-- > instance HttpMethod COPY where
973377-- > type AllowsBody COPY = 'CanHaveBody
974378-- > httpMethodName Proxy = "COPY"
379+
975380class HttpMethod a where
976− -- | Type function 'AllowsBody' returns a type of kind 'CanHaveBody' which
977− -- tells the rest of the library whether the method can have body or not.
978− -- We use the special type 'CanHaveBody' lifted to the kind level instead
381+
382+ -- | Type function 'AllowsBody' returns type of kind 'CanHaveBody' which
383+ -- tells the rest of the library whether the method can have a body or
384+ -- not. We use the special type 'CanHaveBody' “lifted” into kind instead
979385 -- of 'Bool' to get more user-friendly compiler messages.
386+
980387 type AllowsBody a :: CanHaveBody
981388
982389 -- | Return name of the method as a 'ByteString'.
983− httpMethodName :: Proxy a -> ByteString
984390
985−instance (HttpMethod method) => RequestComponent (Tagged "method" method) where
391+ httpMethodName :: Proxy a -> Y.Method
392+
393+instance HttpMethod method => RequestComponent (Womb "method" method) where
986394 getRequestMod _ = Endo $ \x ->
987− x {L.method = httpMethodName (Proxy :: Proxy method)}
395+ x { L.method = httpMethodName (Proxy :: Proxy method) }
988396
989397----------------------------------------------------------------------------
990−-- Request—URL
991−
992−-- $url
993−--
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'.
398+-- Request — URL
996399
997400-- | Request's 'Url'. Start constructing your 'Url' with 'http' or 'https'
998−-- specifying the scheme and host at the same time. Then use the @('/~')@
999−-- and @('/:')@ operators to grow the path one piece at a time. Every single
1000−-- piece of path will be url(percent)-encoded, so using @('/~')@ and
1001−-- @('/:')@ is the only way to have forward slashes between path segments.
1002−-- This approach makes working with dynamic path segments easy and safe. See
1003−-- examples below how to represent various 'Url's (make sure the
1004−-- @OverloadedStrings@ language extension is enabled).
401+-- specifying the scheme and host at the same time. Then use the @('/:')@
402+-- constructor to grow path one piece at a time. Every single piece of path
403+-- will be url(percent)-encoded, so @('/:')@ is the only way to have forward
404+-- slashes between path segments. This approach makes working with dynamic
405+-- path segments easy and safe. See examples below how to represent various
406+-- 'Url's (make sure the @OverloadedStrings@ language extension is enabled).
1005407--
1006408-- ==== __Examples__
1007409--
@@ -1017,1035 +419,230 @@ instance (HttpMethod method) => RequestComponent (Tagged "method" method) where
1017419-- > https "httpbin.org" /: "foo" /: "bar/baz"
1018420-- > -- https://httpbin.org/foo/bar%2Fbaz
1019421--
1020−-- > https "httpbin.org" /: "bytes" /~ (10 :: Int)
1021−-- > -- https://httpbin.org/bytes/10
1022−--
1023422-- > https "юникод.рф"
1024423-- > -- https://%D1%8E%D0%BD%D0%B8%D0%BA%D0%BE%D0%B4.%D1%80%D1%84
1025−data Url (scheme :: Scheme) = Url Scheme (NonEmpty Text)
1026− -- NOTE The second value is the path segments in reversed order.
1027− deriving (Eq, Ord, Show, Data, Generic)
1028−
1029−type role Url nominal
1030−
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
1034− lift url =
1035− TH.dataToExpQ (fmap liftText . cast) url `TH.sigE` case url of
1036− Url Http _ -> [t|Url 'Http|]
1037− Url Https _ -> [t|Url 'Https|]
1038− where
1039− liftText t = TH.AppE (TH.VarE 'T.pack) <$> TH.lift (T.unpack t)
1040− liftTyped = TH.Code . TH.unsafeTExpCoerce . TH.lift
1041−
1042−-- | Given host name, produce a 'Url' which has “http” as its scheme and
424+
425+data Url = Url Bool (NonEmpty Text)
426+ -- NOTE The first 'Bool' value specifies if the 'Url' has “https” as its
427+ -- scheme (otherwise “http” is assumed). The second value is path segments
428+ -- in reversed order.
429+ deriving (Eq, Ord, Data, Typeable, Generic)
430+
431+-- | Given host name, produce a 'Url' which have “http” as its scheme and
1043432-- empty path. This also sets port to @80@.
1044−http :: Text -> Url 'Http
1045−http = Url Http . pure
1046433
1047−-- | Given host name, produce a 'Url' which has “https” as its scheme and
434+http :: Text -> Url
435+http = Url False . pure
436+
437+-- | Given host name, produce a 'Url' which have “https” as its scheme and
1048438-- empty path. This also sets port to @443@.
1049−https :: Text -> Url 'Https
1050−https = Url Https . pure
1051439
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'.
1054−infixl 5 /~
440+https :: Text -> Url
441+https = Url True . pure
1055442
1056−(/~) :: (ToHttpApiData a) => Url scheme -> a -> Url scheme
1057−Url secure path /~ segment = Url secure (NE.cons (toUrlPiece segment) path)
443+-- | Grow given 'Url' appending a single path segment to it.
1058444
1059−-- | A type-constrained version of @('/~')@ to remove ambiguity in the cases
1060−-- when next URL piece is a 'Data.Text.Text' literal.
1061445infixl 5 /:
1062−
1063−(/:) :: Url scheme -> Text -> Url scheme
1064−(/:) = (/~)
1065−
1066−-- | Render a 'Url' as 'Text'.
1067−--
1068−-- @since 3.4.0
1069−renderUrl :: Url scheme -> Text
1070−renderUrl = \case
1071− Url Https parts ->
1072− "https://" <> renderParts parts
1073− Url Http parts ->
1074− "http://" <> renderParts parts
1075− where
1076− renderParts parts =
1077− T.intercalate "/" (reverse $ NE.toList parts)
1078−
1079−-- | The 'useHttpURI' function provides an alternative method to get 'Url'
1080−-- (possibly with some 'Option's) from a 'URI'. This is useful when you are
1081−-- given a URL to query dynamically and don't know it beforehand.
1082−--
1083−-- This function expects the scheme to be “http” and host to be present.
1084−--
1085−-- @since 3.0.0
1086−useHttpURI :: URI -> Maybe (Url 'Http, Option scheme)
1087−useHttpURI uri = do
1088− guard (URI.uriScheme uri == Just [QQ.scheme|http|])
1089− urlHead <- http <$> uriHost uri
1090− let url = case URI.uriPath uri of
1091− Nothing -> urlHead
1092− Just uriPath -> uriPathToUrl uriPath urlHead
1093− return (url, uriOptions uri)
1094−
1095−-- | Just like 'useHttpURI', but expects the “https” scheme.
1096−--
1097−-- @since 3.0.0
1098−useHttpsURI :: URI -> Maybe (Url 'Https, Option scheme)
1099−useHttpsURI uri = do
1100− guard (URI.uriScheme uri == Just [QQ.scheme|https|])
1101− urlHead <- https <$> uriHost uri
1102− let url = case URI.uriPath uri of
1103− Nothing -> urlHead
1104− Just uriPath -> uriPathToUrl uriPath urlHead
1105− return (url, uriOptions uri)
1106−
1107−-- | Convert URI path to a 'Url'. Internal.
1108−--
1109−-- @since 3.9.0
1110−uriPathToUrl ::
1111− (Bool, NonEmpty (URI.RText 'URI.PathPiece)) ->
1112− Url scheme ->
1113− Url scheme
1114−uriPathToUrl (trailingSlash, xs) urlHead =
1115− if trailingSlash then path /: T.empty else path
1116− where
1117− path = foldl' (/:) urlHead (URI.unRText <$> NE.toList xs)
1118−
1119−-- | A combination of 'useHttpURI' and 'useHttpsURI' for cases when scheme
1120−-- is not known in advance.
1121−--
1122−-- @since 3.0.0
1123−useURI ::
1124− URI ->
1125− Maybe
1126− ( Either
1127− (Url 'Http, Option scheme0)
1128− (Url 'Https, Option scheme1)
1129− )
1130−useURI uri =
1131− (Left <$> useHttpURI uri) <|> (Right <$> useHttpsURI uri)
1132−
1133−-- | An internal helper function to extract host from a 'URI'.
1134−uriHost :: URI -> Maybe Text
1135−uriHost uri = case URI.uriAuthority uri of
1136− Left _ -> Nothing
1137− Right URI.Authority {..} ->
1138− Just (URI.unRText authHost)
1139−
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.
1143−--
1144−-- @since 3.2.0
1145−urlQ :: TH.QuasiQuoter
1146−urlQ =
1147− 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"
1153− Just eurl ->
1154− TH.tupE
1155− [ either (TH.lift . fst) (TH.lift . fst) eurl,
1156− [|uriOptions uri|]
1157− ],
1158− quotePat = error "This usage is not supported",
1159− quoteType = error "This usage is not supported",
1160− quoteDec = error "This usage is not supported"
1161− }
1162−
1163−-- | An internal helper function to extract 'Option's from a 'URI'.
1164−uriOptions :: forall scheme. URI -> Option scheme
1165−uriOptions uri =
1166− mconcat
1167− [ auth,
1168− query,
1169− port'
1170− -- , fragment'
1171− ]
1172− where
1173− (auth, port') =
1174− case URI.uriAuthority uri of
1175− Left _ -> (mempty, mempty)
1176− Right URI.Authority {..} ->
1177− let auth0 = case authUserInfo of
1178− Nothing -> mempty
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
1184− Nothing -> mempty
1185− Just port'' -> port (fromIntegral port'')
1186− in (auth0, port0)
1187− query =
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)
1192−
1193−-- TODO Blocked on upstream: https://github.com/snoyberg/http-client/issues/424
1194−-- fragment' =
1195−-- case URI.uriFragment uri of
1196−-- Nothing -> mempty
1197−-- Just fragment'' -> fragment (URI.unRText fragment'')
1198−
1199−instance RequestComponent (Url scheme) where
1200− getRequestMod (Url scheme segments) = Endo $ \x ->
1201− let (host :| path) = NE.reverse segments
1202− in x
1203− { L.secure = case scheme of
1204− Http -> False
1205− Https -> True,
1206− L.port = case scheme of
1207− Http -> 80
1208− Https -> 443,
1209− L.host = Y.urlEncode False (T.encodeUtf8 host),
1210− L.path =
1211− (BL.toStrict . BB.toLazyByteString . Y.encodePathSegments) path
1212− }
446+(/:) :: Url -> Text -> Url
447+Url secure path /: segment = Url secure (NE.cons segment path)
448+
449+instance RequestComponent Url where
450+ getRequestMod (Url secure segments) = Endo $ \x ->
451+ let (host :| path) = NE.reverse segments in
452+ x { L.secure = secure
453+ , L.port = if secure then 443 else 80
454+ , L.host = Y.urlEncode False (T.encodeUtf8 host)
455+ , L.path =
456+ (BL.toStrict . R.toLazyByteString . Y.encodePathSegments) path }
1213457
1214458----------------------------------------------------------------------------
1215−-- Request—Body
459+-- Request — Body
1216460
1217−-- $body
1218−--
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
1223−-- 'HttpBody'.
1224−
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'.
1228−--
1229−-- Using of this body option does not set the @Content-Type@ header.
1230−data NoReqBody = NoReqBody
1231−
1232−instance HttpBody NoReqBody where
1233− getRequestBody NoReqBody = L.RequestBodyBS B.empty
1234−
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.
1239−--
1240−-- This body option sets the @Content-Type@ header to @\"application/json;
1241−-- charset=utf-8\"@ value.
1242−newtype ReqBodyJson a = ReqBodyJson a
1243−
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"
1247−
1248−-- | This body option streams request body from a file. It is expected that
1249−-- the file size does not change during streaming.
1250−--
1251−-- Using of this body option does not set the @Content-Type@ header.
1252−newtype ReqBodyFile = ReqBodyFile FilePath
1253−
1254−instance HttpBody ReqBodyFile where
1255− getRequestBody (ReqBodyFile path) =
1256− LI.RequestBodyIO (L.streamFile path)
1257−
1258−-- | HTTP request body represented by a strict 'ByteString'.
1259−--
1260−-- Using of this body option does not set the @Content-Type@ header.
1261−newtype ReqBodyBs = ReqBodyBs ByteString
461+class HttpBody b where
462+ type ProvidesBody b :: CanHaveBody
463+ getReqestBody :: b -> ByteString -- FIXME should use a conduit here
1262464
1263−instance HttpBody ReqBodyBs where
1264− getRequestBody (ReqBodyBs bs) = L.RequestBodyBS bs
1265−
1266−-- | HTTP request body represented by a lazy 'BL.ByteString'.
1267−--
1268−-- Using of this body option does not set the @Content-Type@ header.
1269−newtype ReqBodyLbs = ReqBodyLbs BL.ByteString
1270−
1271−instance HttpBody ReqBodyLbs where
1272− getRequestBody (ReqBodyLbs bs) = L.RequestBodyLBS bs
1273−
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'.
1279−--
1280−-- This body option sets the @Content-Type@ header to
1281−-- @\"application/x-www-form-urlencoded\"@ value.
1282−newtype ReqBodyUrlEnc = ReqBodyUrlEnc FormUrlEncodedParam
1283−
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"
1288−
1289−-- | An opaque monoidal value that allows to collect URL-encoded parameters
1290−-- to be wrapped in 'ReqBodyUrlEnc'.
1291−newtype FormUrlEncodedParam = FormUrlEncodedParam [(Text, Maybe Text)]
1292− deriving (Semigroup, Monoid)
465+data FormUrlEncodedParam = FormUrlEncodedParam Text (Maybe Text)
1293466
1294467instance QueryParam FormUrlEncodedParam where
1295− queryParam name mvalue =
1296− FormUrlEncodedParam [(name, toQueryParam <$> mvalue)]
1297− queryParamToList (FormUrlEncodedParam p) = p
468+ queryParam = FormUrlEncodedParam
1298469
1299−-- | Use 'formToQuery'.
1300−--
1301−-- @since 3.11.0
1302−instance FromForm FormUrlEncodedParam where
1303− fromForm = Right . formToQuery
1304−
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.
1310−--
1311−-- @since 0.2.0
1312−--
1313−-- ==== __Examples__
1314−--
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
1319−-- >
1320−-- > main :: IO ()
1321−-- > main = runReq def $ do
1322−-- > body <-
1323−-- > reqBodyMultipart
1324−-- > [ LM.partBS "title" "My Image"
1325−-- > , LM.partFileSource "file1" "/tmp/image.jpg"
1326−-- > ]
1327−-- > response <-
1328−-- > req POST (http "example.com" /: "post")
1329−-- > body
1330−-- > bsResponse
1331−-- > mempty
1332−-- > liftIO $ print (responseBody response)
1333−data ReqBodyMultipart = ReqBodyMultipart ByteString LI.RequestBody
1334−
1335−instance HttpBody ReqBodyMultipart where
1336− getRequestBody (ReqBodyMultipart _ body) = body
1337− getRequestContentType (ReqBodyMultipart boundary _) =
1338− pure ("multipart/form-data; boundary=" <> boundary)
1339−
1340−-- | Create 'ReqBodyMultipart' request body from a collection of 'LM.Part's.
1341−--
1342−-- @since 0.2.0
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)
1348−
1349−-- | A type class for things that can be interpreted as an HTTP
1350−-- 'L.RequestBody'.
1351−class HttpBody body where
1352− -- | How to get actual 'L.RequestBody'.
1353− getRequestBody :: body -> L.RequestBody
1354−
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
1360−
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
1367−
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'.
1371−type family
1372− HttpBodyAllowed
1373− (allowsBody :: CanHaveBody)
1374− (providesBody :: CanHaveBody) ::
1375− Constraint
1376− where
1377− HttpBodyAllowed 'NoBody 'NoBody = ()
1378− HttpBodyAllowed 'CanHaveBody body = ()
1379− HttpBodyAllowed 'NoBody 'CanHaveBody =
1380− TypeError
1381− ('Text "This HTTP method does not allow attaching a request body.")
1382−
1383−instance (HttpBody body) => RequestComponent (Tagged "body" body) where
1384− getRequestMod (Tagged body) = Endo $ \x ->
1385− x
1386− { L.requestBody = getRequestBody body,
1387− L.requestHeaders =
1388− let old = L.requestHeaders x
1389− in case getRequestContentType body of
1390− Nothing -> old
1391− Just contentType ->
1392− (Y.hContentType, contentType) : old
1393− }
470+instance HttpBody b => RequestComponent (Womb "body" b) where
471+ getRequestMod = undefined -- FIXME
1394472
1395473----------------------------------------------------------------------------
1396−-- Request—Optional parameters
474+-- Request — Optional parameters
1397475
1398−-- $optional-parameters
476+-- $request-optional-parameters
1399477--
1400−-- Optional parameters of request include things like query parameters,
478+-- Optional parameters to a request include things like query parameters,
1401479-- headers, port number, etc. All optional parameters have the type
1402480-- 'Option', which is a 'Monoid'. This means that you can use 'mempty' as
1403481-- the last argument of 'req' to specify no optional parameters, or combine
1404−-- 'Option's using 'mappend' or @('<>')@ to have several of them at once.
1405−
1406−-- | The opaque 'Option' type is a 'Monoid' you can use to pack collection
1407−-- of optional parameters like query parameters and headers. See sections
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))
1411−
1412−-- NOTE 'QueryText' is just [(Text, Maybe Text)], we keep it along with
1413−-- Request to avoid appending to an existing query string in request every
1414−-- time new parameter is added. The additional Maybe (L.Request -> IO
1415−-- L.Request) is a finalizer that will be applied after all other
1416−-- transformations. This is for authentication methods that sign requests
1417−-- based on data in Request.
1418−
1419−instance Semigroup (Option scheme) where
1420− Option er0 mr0 <> Option er1 mr1 =
1421− Option
1422− (er0 <> er1)
1423− (mr0 <|> mr1)
1424−
1425−instance Monoid (Option scheme) where
1426− mempty = Option mempty Nothing
1427− mappend = (<>)
1428−
1429−-- | Use 'formToQuery'.
1430−--
1431−-- @since 3.11.0
1432−instance FromForm (Option scheme) where
1433− fromForm = Right . formToQuery
482+-- 'Option's using 'mappend' (or @('<>')@) to have several of them at once.
483+
484+-- | Opaque 'Option' type is a 'Monoid' you can use to pack collection of
485+-- optional parameters like query parameters and headers. See sections below
486+-- to learn which 'Option' primitives are available.
487+
488+-- TODO We need examples here.
489+
490+newtype Option = Option (Endo (Y.QueryText, L.Request))
491+ -- NOTE 'QueryText' is just [(Text, Maybe Text)], we keep it along with
492+ -- Request to avoid appending to existing query string in request every
493+ -- time new parameter is added.
494+ deriving (Semigroup, Monoid)
1434495
1435496-- | A helper to create an 'Option' that modifies only collection of query
1436−-- parameters. This helper is not a part of the public API.
1437−withQueryParams :: (Y.QueryText -> Y.QueryText) -> Option scheme
1438−withQueryParams f = Option (Endo (first f)) Nothing
497+-- parameters. This helper is not a part of public API.
498+
499+withQueryParams :: (Y.QueryText -> Y.QueryText) -> Option
500+withQueryParams = Option . Endo . first
1439501
1440502-- | A helper to create an 'Option' that modifies only 'L.Request'. This
1441503-- helper is not a part of public API.
1442−withRequest :: (L.Request -> L.Request) -> Option scheme
1443−withRequest f = Option (Endo (second f)) Nothing
1444504
1445−instance RequestComponent (Option scheme) where
1446− getRequestMod (Option f _) = Endo $ \x ->
1447− let (qparams, x') = appEndo f ([], x)
1448− query = Y.renderQuery True (Y.queryTextToQuery qparams)
1449− in x' {L.queryString = query}
505+withRequest :: (L.Request -> L.Request) -> Option
506+withRequest = Option . Endo . second
1450507
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
508+instance RequestComponent Option where
509+ getRequestMod (Option f) = Endo $ \x ->
510+ let (qparams, x') = appEndo f ([], x)
511+ query = Y.renderQuery True (Y.queryTextToQuery qparams)
512+ in x' { L.queryString = query }
1455513
1456514----------------------------------------------------------------------------
1457−-- Request—Optional parameters—Query Parameters
1458−
1459−-- $query-parameters
1460−--
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').
515+-- Request — Optional parameters — Query Parameters
1464516
1465517-- | This operator builds a query parameter that will be included in URL of
1466−-- your request after the question sign @?@. This is the same syntax you use
518+-- your request after question sign @?@. This is the same syntax you use
1467519-- with form URL encoded request bodies.
1468520--
1469521-- This operator is defined in terms of 'queryParam':
1470522--
1471523-- > name =: value = queryParam name (pure value)
1472−infix 7 =:
1473524
1474−(=:) :: (QueryParam param, ToHttpApiData a) => Text -> a -> param
525+infix 7 =:
526+(=:) :: QueryParam a => Text -> Text -> a
1475527name =: value = queryParam name (pure value)
1476528
1477−-- | Construct a flag, that is, a valueless query parameter. For example, in
1478−-- the following URL @\"a\"@ is a flag, while @\"b\"@ is a query parameter
1479−-- with a value:
529+-- | Construct a flag, that is, valueless query parameter. For example, in
530+-- the following URL @a@ is a flag, @b@ is a query parameter with a value:
1480531--
1481532-- > https://httpbin.org/foo/bar?a&b=10
1482533--
1483534-- This operator is defined in terms of 'queryParam':
1484535--
1485−-- > queryFlag name = queryParam name (Nothing :: Maybe ())
1486−queryFlag :: (QueryParam param) => Text -> param
1487−queryFlag name = queryParam name (Nothing :: Maybe ())
536+-- > queryFlag name = queryParam name Nothing
1488537
1489−-- | Construct query parameters from a 'ToForm' instance. This function
1490−-- produces the same query params as 'Form.urlEncodeAsFormStable'.
1491−--
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@).
1496−--
1497−-- @since 3.11.0
1498−formToQuery :: (QueryParam param, Monoid param, ToForm f) => f -> param
1499−formToQuery f = mconcat . fmap toParam . Form.toListStable $ toForm f
1500− where
1501− toParam (key, val) =
1502− queryParam key $
1503− if val == ""
1504− then Nothing
1505− else Just val
1506−
1507−-- | A type class for query-parameter-like things. The reason to have an
1508−-- overloaded 'queryParam' is to be able to use it as an 'Option' and as a
538+queryFlag :: QueryParam a => Text -> a
539+queryFlag name = queryParam name Nothing
540+
541+-- | A type class for query-parameter-like things. The reason to have
542+-- overloaded 'queryParam' is to be able to use as an 'Option' and as a
1509543-- 'FormUrlEncodedParam' when constructing form URL encoded request bodies.
1510544-- Having the same syntax for these cases seems natural and user-friendly.
1511−class QueryParam param where
545+
546+class QueryParam a where
547+
1512548 -- | Create a query parameter with given name and value. If value is
1513549 -- 'Nothing', it won't be included at all (i.e. you create a flag this
1514550 -- way). It's recommended to use @('=:')@ and 'queryFlag' instead of this
1515551 -- method, because they are easier to read.
1516− queryParam :: (ToHttpApiData a) => Text -> Maybe a -> param
1517552
1518− -- | Get the query parameter names and values set by 'queryParam'.
1519− --
1520− -- @since 3.11.0
1521− queryParamToList :: param -> [(Text, Maybe Text)]
553+ queryParam :: Text -> Maybe Text -> a
1522554
1523−instance QueryParam (Option scheme) where
1524− queryParam name mvalue =
1525− withQueryParams ((:) (name, toQueryParam <$> mvalue))
1526− queryParamToList (Option f _) = fst $ appEndo f ([], L.defaultRequest)
555+instance QueryParam Option where
556+ queryParam name mvalue = withQueryParams ((:) (name, mvalue))
1527557
1528558----------------------------------------------------------------------------
1529−-- Request—Optional parameters—Headers
1530−
1531−-- | Create an 'Option' that adds a header. Note that if you 'mappend' two
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
1534−-- same name.
1535−header ::
1536− -- | Header name
1537− ByteString ->
1538− -- | Header value
1539− ByteString ->
1540− Option scheme
1541−header name value = withRequest (attachHeader name value)
1542−
1543−-- | Attach a header with given name and content to a 'L.Request'.
1544−--
1545−-- @since 1.1.0
1546−attachHeader :: ByteString -> ByteString -> L.Request -> L.Request
1547−attachHeader name value x =
1548− x {L.requestHeaders = (CI.mk name, value) : L.requestHeaders x}
559+-- Request — Optional parameters — Headers
1549560
1550−-- | Same as 'header', but with redacted values on print.
1551−--
1552−-- @since 3.13.0
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}
561+-- | Create an 'Option' that adds a header. The 'Text' values will be
562+-- inserted in UTF-8 encoding.
1557563
1558−----------------------------------------------------------------------------
1559−-- Request—Optional parameters—Cookies
564+header
565+ :: Text -- ^ Header name
566+ -> Text -- ^ Header value
567+ -> Option
568+header name value = withRequest $ \x ->
569+ let name' = T.encodeUtf8 name
570+ value' = T.encodeUtf8 value
571+ in x { L.requestHeaders = (CI.mk name', value') : L.requestHeaders x }
1560572
1561−-- $cookies
1562−--
1563−-- Support for cookies is quite minimalistic at the moment. It's possible to
1564−-- specify which cookies to send using 'cookieJar' and inspect 'L.Response'
1565−-- to extract 'L.CookieJar' from it (see 'responseCookieJar').
573+----------------------------------------------------------------------------
574+-- Request — Optional parameters — Cookies
1566575
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}
576+-- TODO No idea right now.
1572577
1573578----------------------------------------------------------------------------
1574−-- Request—Optional parameters—Authentication
579+-- Request — Optional parameters — Authentication
1575580
1576−-- $authentication
1577−--
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
1584−-- data.
1585−
1586−-- | The 'Option' adds basic authentication.
1587−--
1588−-- See also: <https://en.wikipedia.org/wiki/Basic_access_authentication>.
1589−basicAuth ::
1590− -- | Username
1591− ByteString ->
1592− -- | Password
1593− ByteString ->
1594− -- | Auth 'Option'
1595− Option 'Https
1596−basicAuth = basicAuthUnsafe
1597−
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.
1601−--
1602−-- @since 0.3.1
1603−basicAuthUnsafe ::
1604− -- | Username
1605− ByteString ->
1606− -- | Password
1607− ByteString ->
1608− -- | Auth 'Option'
1609− Option scheme
1610−basicAuthUnsafe username password =
1611− customAuth
1612− (pure . L.applyBasicAuth username password)
1613−
1614−-- | The 'Option' set basic proxy authentication header.
1615−--
1616−-- @since 1.1.0
1617−basicProxyAuth ::
1618− -- | Username
1619− ByteString ->
1620− -- | Password
1621− ByteString ->
1622− -- | Auth 'Option'
1623− Option scheme
1624−basicProxyAuth username password =
1625− withRequest (L.applyBasicProxyAuth username password)
1626−
1627−-- | The 'Option' adds OAuth1 authentication.
1628−--
1629−-- @since 0.2.0
1630−oAuth1 ::
1631− -- | Consumer token
1632− ByteString ->
1633− -- | Consumer secret
1634− ByteString ->
1635− -- | OAuth token
1636− ByteString ->
1637− -- | OAuth token secret
1638− ByteString ->
1639− -- | Auth 'Option'
1640− Option scheme
1641−oAuth1 consumerToken consumerSecret token tokenSecret =
1642− customAuth (OAuth.signOAuth app creds)
1643− where
1644− app =
1645− OAuth.newOAuth
1646− { OAuth.oauthConsumerKey = consumerToken,
1647− OAuth.oauthConsumerSecret = consumerSecret
1648− }
1649− creds = OAuth.newCredential token tokenSecret
1650−
1651−-- | The 'Option' adds an OAuth2 bearer token. This is treated by many
1652−-- services as the equivalent of a username and password.
1653−--
1654−-- The 'Option' is defined as:
1655−--
1656−-- > oAuth2Bearer token = header "Authorization" ("Bearer " <> token)
1657−--
1658−-- See also: <https://en.wikipedia.org/wiki/OAuth>.
1659−oAuth2Bearer ::
1660− -- | Token
1661− ByteString ->
1662− -- | Auth 'Option'
1663− Option 'Https
1664−oAuth2Bearer token =
1665− customAuth
1666− (pure . attachHeader "Authorization" ("Bearer " <> token))
1667−
1668−-- | The 'Option' adds a not-quite-standard OAuth2 bearer token (that seems
1669−-- to be used only by GitHub). This will be treated by whatever services
1670−-- accept it as the equivalent of a username and password.
1671−--
1672−-- The 'Option' is defined as:
1673−--
1674−-- > oAuth2Token token = header "Authorization" ("token" <> token)
1675−--
1676−-- See also: <https://developer.github.com/v3/oauth#3-use-the-access-token-to-access-the-api>.
1677−oAuth2Token ::
1678− -- | Token
1679− ByteString ->
1680− -- | Auth 'Option'
1681− Option 'Https
1682−oAuth2Token token =
1683− customAuth
1684− (pure . attachHeader "Authorization" ("token " <> token))
1685−
1686−-- | A helper to create custom authentication 'Option's. The given
1687−-- 'IO'-enabled request transformation is applied after all other
1688−-- modifications when constructing a request. Use wisely.
1689−--
1690−-- @since 1.1.0
1691−customAuth :: (L.Request -> IO L.Request) -> Option scheme
1692−customAuth = Option mempty . pure
581+-- TODO basicAuth
582+-- TODO oAuth1
583+-- TODO oAuth2Bearer
584+-- TODO oAuth2Token
585+-- TODO awsAuth
1693586
1694587----------------------------------------------------------------------------
1695−-- Request—Optional parameters—Other
588+-- Request — Optional parameters — Other
1696589
1697590-- | Specify the port to connect to explicitly. Normally, 'Url' you use
1698−-- determines the default port: @80@ for HTTP and @443@ for HTTPS. This
1699−-- 'Option' allows us to choose an arbitrary port overwriting the defaults.
1700−port :: Int -> Option scheme
1701−port n = withRequest $ \x ->
1702− x {L.port = n}
591+-- determines default port, @80@ for HTTP and @443@ for HTTPS, this 'Option'
592+-- allows to choose arbitrary port overwriting the defaults.
1703593
1704−-- | This 'Option' controls whether gzipped data should be decompressed on
1705−-- the fly. By default everything except for @\"application\/x-tar\"@ is
1706−-- decompressed, i.e. we have:
1707−--
1708−-- > decompress (/= "application/x-tar")
1709−--
1710−-- You can also choose to decompress everything like this:
1711−--
1712−-- > decompress (const True)
1713−decompress ::
1714− -- | Predicate that is given MIME type, it returns 'True' when content
1715− -- should be decompressed on the fly.
1716− (ByteString -> Bool) ->
1717− Option scheme
1718−decompress f = withRequest $ \x ->
1719− x {L.decompress = f}
1720−
1721−-- | Specify the number of microseconds to wait for response. The default
1722−-- value is 30 seconds (defined in 'L.ManagerSettings' of connection
1723−-- 'L.Manager').
1724−responseTimeout ::
1725− -- | Number of microseconds to wait
1726− Int ->
1727− Option scheme
1728−responseTimeout n = withRequest $ \x ->
1729− x {L.responseTimeout = LI.ResponseTimeoutMicro n}
1730−
1731−-- | HTTP version to send to the server, the default is HTTP 1.1.
1732−httpVersion ::
1733− -- | Major version number
1734− Int ->
1735− -- | Minor version number
1736− Int ->
1737− Option scheme
1738−httpVersion major minor = withRequest $ \x ->
1739− x {L.requestVersion = Y.HttpVersion major minor}
1740−
1741−----------------------------------------------------------------------------
1742−-- Response interpretations
1743−
1744−-- | Make a request and ignore the body of the response.
1745−newtype IgnoreResponse = IgnoreResponse (L.Response ())
1746− deriving (Show)
1747−
1748−instance HttpResponse IgnoreResponse where
1749− type HttpResponseBody IgnoreResponse = ()
1750− toVanillaResponse (IgnoreResponse r) = r
1751− getHttpResponse r = return $ IgnoreResponse (void r)
1752−
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
1757−
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)
1763− deriving (Show)
1764−
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"
1774−
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
1779−
1780−-- | Make a request and interpret the body of the response as a strict
1781−-- 'ByteString'.
1782−newtype BsResponse = BsResponse (L.Response ByteString)
1783− deriving (Show)
1784−
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)
1791−
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
1795−bsResponse = Proxy
1796−
1797−-- | Make a request and interpret the body of the response as a lazy
1798−-- 'BL.ByteString'.
1799−newtype LbsResponse = LbsResponse (L.Response BL.ByteString)
1800− deriving (Show)
1801−
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)
1808−
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
1812−lbsResponse = Proxy
1813−
1814−----------------------------------------------------------------------------
1815−-- Helpers for response interpretations
1816−
1817−-- | Fetch beginning of the response and return it together with a new
1818−-- @'L.Response' 'L.BodyReader'@ that can be passed to 'getHttpResponse' and
1819−-- such.
1820−grabPreview ::
1821− -- | How many bytes to fetch
1822− Int ->
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)
1831− let br' = do
1832− n <- readIORef nref
1833− let incn = modifyIORef' nref (+ 1)
1834− case n of
1835− 0 -> do
1836− incn
1837− if B.null target
1838− then br'
1839− else return target
1840− 1 -> do
1841− incn
1842− if B.null leftover
1843− then br'
1844− else return leftover
1845− _ ->
1846− if done
1847− then return B.empty
1848− else br
1849− return (target, r {L.responseBody = br'})
1850−
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.
1853−brReadN ::
1854− -- | Body reader to stream from
1855− L.BodyReader ->
1856− -- | How many bytes to consume
1857− Int ->
1858− -- | Target chunk, the leftover, whether we're done
1859− IO (ByteString, ByteString, Bool)
1860−brReadN br n = go 0 id id
1861− where
1862− go !tlen t l = do
1863− chunk <- br
1864− if B.null chunk
1865− then return (r t, r l, True)
1866− else do
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 [])
594+port :: Word -> Option
595+port n = withRequest $ \x ->
596+ x { L.port = fromIntegral n }
1875597
1876−----------------------------------------------------------------------------
1877−-- Inspecting a response
1878−
1879−-- | Get the response body.
1880−responseBody ::
1881− (HttpResponse response) =>
1882− response ->
1883− HttpResponseBody response
1884−responseBody = L.responseBody . toVanillaResponse
1885−
1886−-- | Get the response status code.
1887−responseStatusCode ::
1888− (HttpResponse response) =>
1889− response ->
1890− Int
1891−responseStatusCode =
1892− Y.statusCode . L.responseStatus . toVanillaResponse
1893−
1894−-- | Get the response status message.
1895−responseStatusMessage ::
1896− (HttpResponse response) =>
1897− response ->
1898− ByteString
1899−responseStatusMessage =
1900− Y.statusMessage . L.responseStatus . toVanillaResponse
1901−
1902−-- | Lookup a particular header from a response.
1903−responseHeader ::
1904− (HttpResponse response) =>
1905− -- | Response interpretation
1906− response ->
1907− -- | Header to lookup
1908− ByteString ->
1909− -- | Header value if found
1910− Maybe ByteString
1911−responseHeader r h =
1912− (lookup (CI.mk h) . L.responseHeaders . toVanillaResponse) r
1913−
1914−-- | Get the response 'L.CookieJar'.
1915−responseCookieJar ::
1916− (HttpResponse response) =>
1917− response ->
1918− L.CookieJar
1919−responseCookieJar = L.responseCookieJar . toVanillaResponse
598+-- TODO decompress
599+-- TODO responseTimeout
600+-- TODO requestVersion
1920601
1921602----------------------------------------------------------------------------
1922−-- Response—Defining your own interpretation
603+-- Response
1923604
1924−-- $new-response-interpretation
1925−--
1926−-- To create a new response interpretation you just need to make your data
1927−-- type an instance of the 'HttpResponse' type class.
605+-- Here we need to provide various options how to consume responses.
1928606
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.
1932607class 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
1936−
1937− -- | The method describes how to get the underlying 'L.Response' record.
1938− toVanillaResponse :: response -> L.Response (HttpResponseBody response)
1939−
1940− -- | This method describes how to consume response body and, more
1941− -- generally, obtain @response@ value from @'L.Response' 'L.BodyReader'@.
1942− --
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.)
1950− --
1951− -- __Note__: signature of this function was changed in the version
1952− -- /1.0.0/.
1953− getHttpResponse ::
1954− -- | Response with body reader inside
1955− L.Response L.BodyReader ->
1956− -- | The final result
1957− IO response
1958−
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.
1962− --
1963− -- __Note__: manually specified 'Options' that set the @\"Accept\"@ header
1964− -- will take precedence.
1965− --
1966− -- @since 2.1.0
1967− acceptHeader :: Proxy response -> Maybe ByteString
1968− acceptHeader Proxy = Nothing
1969−
1970−-- | This instance has been added to make it easier to inspect 'L.Response'
1971−-- using Req's functions like 'responseStatusCode', 'responseStatusMessage',
1972−-- etc.
1973−--
1974−-- @since 3.12.0
1975−instance HttpResponse (L.Response ()) where
1976− type HttpResponseBody (L.Response ()) = ()
1977− toVanillaResponse = id
1978− getHttpResponse = return . void
608+ getHttpResponse :: L.Manager -> L.Request -> IO response
609+
610+-- helpers to
1979611
1980612----------------------------------------------------------------------------
1981613-- Other
1982614
1983615-- | The main class for things that are “parts” of 'L.Request' in the sense
1984616-- that if we have a 'L.Request', then we know how to apply an instance of
1985−-- 'RequestComponent' changing\/overwriting something in it. 'Endo' is a
1986−-- monoid of endomorphisms under composition, it's used to chain different
1987−-- request components easier using @('<>')@.
1988−--
1989−-- __Note__: this type class is not a part of the public API.
617+-- 'RequestComponent' changing\/overwriting something in it. 'Endo' is
618+-- endomorphism of functions under composition, it's used to chain different
619+-- request component easier using @('<>')@.
620+
1990621class RequestComponent a where
622+
1991623 -- | Get a function that takes a 'L.Request' and changes it somehow
1992− -- returning another 'L.Request'. For example, the 'HttpMethod' instance
1993− -- of 'RequestComponent' just overwrites method. The function is wrapped
1994− -- in 'Endo' so it's easier to chain such “modifying applications”
1995− -- together building bigger and bigger 'RequestComponent's.
624+ -- returning another 'L.Request'. For example HTTP method instance of
625+ -- 'RequestComponent' just overwrites method. The function is wrapped in
626+ -- 'Endo' so it's easier to chain such “modifying applications” together
627+ -- building bigger and bigger 'RequestComponent's.
628+
1996629 getRequestMod :: a -> Endo L.Request
1997630
1998−-- | This wrapper is only used to attach a type-level tag to a given type.
631+-- | This wrapper is only used to attach a type-level tag to given type.
1999632-- This is necessary to define instances of 'RequestComponent' for any thing
2000−-- that implements 'HttpMethod' or 'HttpBody'. Without the tag, GHC can't
2001−-- see the difference between @'HttpMethod' method => 'RequestComponent'
633+-- that implements 'HttpMethod' or 'HttpBody'. Without the tag, GHC is not
634+-- able to see difference between @'HttpMethod' method => 'RequestComponent'
2002635-- method@ and @'HttpBody' body => 'RequestComponent' body@ when it decides
2003−-- which instance to use (i.e. the constraints are taken into account later,
636+-- which instance to use (i.e. constraints are taken into account later,
2004637-- when instance is already chosen).
2005−newtype Tagged (tag :: Symbol) a = Tagged a
2006−
2007−-- | Exceptions that this library throws.
2008−data HttpException
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
2012− -- failed
2013− JsonHttpException String
2014− deriving (Show, Generic)
2015638
2016−instance Exception HttpException
639+newtype Womb (tag :: Symbol) a = Womb a
2017640
2018−-- | Return 'Just' if the given 'HttpException' is wrapping a http-client's
2019−-- 'L.StatusCodeException'. Otherwise, return 'Nothing'.
2020−--
2021−-- @since 3.12.0
2022−isStatusCodeException :: HttpException -> Maybe (L.Response ())
2023−isStatusCodeException
2024− ( VanillaHttpException
2025− ( L.HttpExceptionRequest
2026− _
2027− (L.StatusCodeException r _)
2028− )
2029− ) = Just r
2030−isStatusCodeException _ = Nothing
2031−
2032−-- | A simple type isomorphic to 'Bool' that we only have for better error
2033−-- messages. We use it as a kind and its data constructors as type-level
2034−-- tags.
641+-- | A simple 'Bool'-like type we only have for better error messages. We
642+-- use it as a kind and its data constructors as type-level tags.
2035643--
2036644-- See also: 'HttpMethod' and 'HttpBody'.
645+
2037646data CanHaveBody
2038− = -- | Indeed can have a body
2039− CanHaveBody
2040− | -- | Should not have a body
2041− NoBody
2042−
2043−-- | A type-level tag that specifies URL scheme used (and thus if HTTPS is
2044−-- enabled). This is used to force TLS requirement for some authentication
2045−-- 'Option's.
2046−data Scheme
2047− = -- | HTTP
2048− Http
2049− | -- | HTTPS
2050− Https
2051− deriving (Eq, Ord, Show, Data, Generic, TH.Lift)
647+ = CanHaveBody -- ^ Indeed can have a body
648+ | NoBody -- ^ Should not have a body