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../CONTRIBUTING.md
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../README.md
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servant – Type-Level Web DSL
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============================
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servant – A Type-Level Web DSL
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==============================
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.. image:: https://raw.githubusercontent.com/haskell-servant/servant/master/servant.png
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Documentation table of contents
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-------------------------------
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.. toctree::
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:maxdepth: 2
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README.md
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introduction.rst
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tutorial/index.rst
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CONTRIBUTING.md
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links.rst
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44
doc/introduction.rst
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doc/introduction.rst
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Introduction
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------------
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*servant* has the following guiding principles:
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- concision
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This is a pretty wide-ranging principle. You should be able to get nice
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documentation for your web servers, and client libraries, without repeating
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yourself. You should not have to manually serialize and deserialize your
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resources, but only declare how to do those things *once per type*. If a
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bunch of your handlers take the same query parameters, you shouldn't have to
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repeat that logic for each handler, but instead just "apply" it to all of
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them at once. Your handlers shouldn't be where composition goes to die. And
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so on.
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- flexibility
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If we haven't thought of your use case, it should still be easily
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achievable. If you want to use templating library X, go ahead. Forms? Do
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them however you want, but without difficulty. We're not opinionated.
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- separation of concerns
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Your handlers and your HTTP logic should be separate. True to the philosphy
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at the core of HTTP and REST, with *servant* your handlers return normal
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Haskell datatypes - that's the resource. And then from a description of your
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API, *servant* handles the *presentation* (i.e., the Content-Types). But
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that's just one example.
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- type safety
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Want to be sure your API meets a specification? Your compiler can check
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that for you. Links you can be sure exist? You got it.
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To stick true to these principles, we do things a little differently than you
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might expect. The core idea is *reifying the description of your API*. Once
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reified, everything follows. We think we might be the first web framework to
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reify API descriptions in an extensible way. We're pretty sure we're the first
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to reify it as *types*.
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To be able to write a webservice you only need to read the first two sections,
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but the goal of this document being to get you started with servant, we also
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cover the couple of ways you can extend servant for a great good.
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doc/links.rst
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doc/links.rst
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Helpful Links
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-------------
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- the central documentation (this site):
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`haskell-servant.readthedocs.org <http://haskell-servant.readthedocs.org/>`_
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- the github repo:
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`github.com/haskell-servant/servant <https://github.com/haskell-servant/servant>`_
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- the issue tracker (Feel free to create issues and submit PRs!):
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`https://github.com/haskell-servant/servant/issues <https://github.com/haskell-servant/servant/issues>`_
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- the irc channel:
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#servant on freenode
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- the mailing list:
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`groups.google.com/forum/#!forum/haskell-servant <https://groups.google.com/forum/#!forum/haskell-servant>`_
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- blog posts and videos and slides of some talks on servant:
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`haskell-servant.github.io <http://haskell-servant.github.io>`_
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- the servant packages on hackage:
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- `hackage.haskell.org/package/servant <http://hackage.haskell.org/package/servant>`_
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- `hackage.haskell.org/package/servant-server <http://hackage.haskell.org/package/servant-server>`_
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- `hackage.haskell.org/package/servant-client <http://hackage.haskell.org/package/servant-client>`_
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- `hackage.haskell.org/package/servant-blaze <http://hackage.haskell.org/package/servant-blaze>`_
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- `hackage.haskell.org/package/servant-lucid <http://hackage.haskell.org/package/servant-lucid>`_
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- `hackage.haskell.org/package/servant-cassava <http://hackage.haskell.org/package/servant-cassava>`_
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- `hackage.haskell.org/package/servant-docs <http://hackage.haskell.org/package/servant-docs>`_
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- `hackage.haskell.org/package/servant-foreign <http://hackage.haskell.org/package/servant-foreign>`_
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- `hackage.haskell.org/package/servant-js <http://hackage.haskell.org/package/servant-js>`_
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- `hackage.haskell.org/package/servant-mock <http://hackage.haskell.org/package/servant-mock>`_
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Servant tutorial
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================
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Tutorial
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========
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This is an introductory tutorial to the current version of *servant*, which is
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**0.4**. Any comment or issue can be directed to `this website's issue
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tracker <http://github.com/haskell-servant/haskell-servant.github.io/issues>`_.
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Github
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-------
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- the servant packages: `haskell-servant/servant <https://github.com/haskell-servant/servant>`_
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- the website (including this tutorial): `haskell-servant/haskell-servant.github.io <https://github.com/haskell-servant/haskell-servant.github.io/>`_
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- Feel free to use the issue tracker (or to send PRs!) on the website's repository to give feedback and suggestions about this tutorial
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Introduction
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-------------
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*servant* has the following guiding principles:
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- concision
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This is a pretty wide-ranging principle. You should be able to get nice
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documentation for your web servers, and client libraries, without repeating
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yourself. You should not have to manually serialize and deserialize your
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resources, but only declare how to do those things *once per type*. If a
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bunch of your handlers take the same query parameters, you shouldn't have to
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repeat that logic for each handler, but instead just "apply" it to all of
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them at once. Your handlers shouldn't be where composition goes to die. And
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so on.
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- flexibility
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If we haven't thought of your use case, it should still be easily
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achievable. If you want to use templating library X, go ahead. Forms? Do
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them however you want, but without difficulty. We're not opinionated.
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- separation of concerns
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Your handlers and your HTTP logic should be separate. True to the philosphy
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at the core of HTTP and REST, with *servant* your handlers return normal
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Haskell datatypes - that's the resource. And then from a description of your
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API, *servant* handles the *presentation* (i.e., the Content-Types). But
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that's just one example.
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- type safety
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Want to be sure your API meets a specification? Your compiler can check
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that for you. Links you can be sure exist? You got it.
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To stick true to these principles, we do things a little differently than you
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might expect. The core idea is *reifying the description of your API*. Once
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reified, everything follows. We think we might be the first web framework to
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reify API descriptions in an extensible way. We're pretty sure we're the first
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to reify it as *types*.
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To be able to write a webservice you only need to read the first two sections,
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but the goal of this document being to get you started with servant, we also
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cover the couple of ways you can extend servant for a great good.
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Tutorial
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---------
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.. toctree::
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:maxdepth: 1
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