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36 lines
2.3 KiB
TeX
36 lines
2.3 KiB
TeX
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% WAI-MW.tex
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\begin{hcarentry}{WAI}
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\label{wai}
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\report{Michael Snoyman}%11/14
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\participants{Greg Weber}
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\status{stable}
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\makeheader
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The Web Application Interface (WAI) is an interface between Haskell web
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applications and Haskell web servers. By targeting the WAI, a web framework or web application gets access to multiple deployment platforms. Platforms in use include CGI, the Warp web server, and desktop webkit.
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WAI is also a platform for re-using code between web applications and web frameworks through WAI middleware and WAI applications. WAI middleware can inspect and transform a request, for example by automatically gzipping a response or logging a request. The Yesod~\cref{yesod} web framework provides the ability to embed arbitrary WAI applications as subsites, making them a part of a larger web application.
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By targeting WAI, every web framework can share WAI code instead of wasting
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effort re-implementing the same functionality. There are also some new web
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frameworks that take a completely different approach to web development that
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use WAI, such as webwire (FRP), MFlow (continuation-based) and dingo (GUI).
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The Scotty~\cref{scotty} web framework also continues to be developed, and
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provides a lighter-weight alternative to Yesod. Other frameworks- whether
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existing or newcomers- are welcome to take advantage of the existing WAI
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architecture to focus on the more innovative features of web development.
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WAI applications can send a response themselves. For example, wai-app-static is used by Yesod to serve static files. However, one does not need to use a web framework, but can simply build a web application using the WAI interface alone. The Hoogle %\cref{hoogle}
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web service targets WAI directly.
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Since the last HCAR, WAI has successfully released version 3.0, which removes dependency on any specific streaming data framework. A separate wai-conduit package provides conduit bindings, and such bindings can easily be provided for other streaming data frameworks.
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The WAI community continues to grow, with new applications and web frameworks continuing to be added. We've recently started a new mailing list to discuss WAI related topics. Interested parties are strongly encouraged to join in!
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\FurtherReading
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\begin{compactitem}
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\item\url{http://www.yesodweb.com/book/wai}
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\item\url{https://groups.google.com/d/forum/haskell-wai}
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\end{compactitem}
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\end{hcarentry}
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