12 lines
4.4 KiB
HTML
12 lines
4.4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Servant.API.Get</title><link href="ocean.css" rel="stylesheet" type="text/css" title="Ocean" /><script src="haddock-util.js" type="text/javascript"></script><script type="text/javascript">//<![CDATA[
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window.onload = function () {pageLoad();setSynopsis("mini_Servant-API-Get.html");};
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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="src/Servant-API-Get.html">Source</a></li><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">servant-0.2: A family of combinators for defining webservices APIs and serving them</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Safe Haskell</th><td>None</td></tr><tr><th>Language</th><td>Haskell2010</td></tr></table><p class="caption">Servant.API.Get</p></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><span class="keyword">data</span> <a href="#t:Get">Get</a> a</li></ul></div><div id="interface"><h1>Documentation</h1><div class="top"><p class="src"><span class="keyword">data</span> <a name="t:Get" class="def">Get</a> a <a href="src/Servant-API-Get.html#Get" class="link">Source</a></p><div class="doc"><p>Endpoint for simple GET requests. Serves the result as JSON.</p><p>Example:</p><pre>type MyApi = "books" :> Get [Book]</pre></div><div class="subs instances"><p id="control.i:Get" class="caption collapser" onclick="toggleSection('i:Get')">Instances</p><div id="section.i:Get" class="show"><table><tr><td class="src"><a href="Servant-Utils-Links.html#t:VLinkHelper">VLinkHelper</a> * (<a href="Servant-API-Get.html#t:Get">Get</a> x)</td><td class="doc empty"> </td></tr><tr><td class="src"><a href="https://hackage.haskell.org/package/aeson-0.8.0.2/docs/Data-Aeson-Types.html#t:ToJSON">ToJSON</a> result => <a href="Servant-Server.html#t:HasServer">HasServer</a> (<a href="Servant-API-Get.html#t:Get">Get</a> result)</td><td class="doc"><p>When implementing the handler for a <code><a href="Servant-API-Get.html#t:Get">Get</a></code> endpoint,
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just like for <code><a href="Servant-API-Delete.html#t:Delete">Delete</a></code>, <code><a href="Servant-API-Post.html#t:Post">Post</a></code>
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and <code><a href="Servant-API-Put.html#t:Put">Put</a></code>, the handler code runs in the
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<code>EitherT (Int, String) IO</code> monad, where the <code><a href="https://hackage.haskell.org/package/base-4.7.0.1/docs/Data-Int.html#t:Int">Int</a></code> represents
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the status code and the <code><a href="https://hackage.haskell.org/package/base-4.7.0.1/docs/Data-String.html#t:String">String</a></code> a message, returned in case of
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failure. You can quite handily use <code><a href="Control-Monad-Trans-EitherT.html#v:left">left</a></code>
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to quickly fail if some conditions are not met.</p><p>If successfully returning a value, we just require that its type has
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a <code><a href="https://hackage.haskell.org/package/aeson-0.8.0.2/docs/Data-Aeson-Types.html#t:ToJSON">ToJSON</a></code> instance and servant takes care of encoding it for you,
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yielding status code 200 along the way.</p></td></tr><tr><td class="src"><a href="https://hackage.haskell.org/package/base-4.7.0.1/docs/Data-Typeable-Internal.html#t:Typeable">Typeable</a> (* -> *) <a href="Servant-API-Get.html#t:Get">Get</a></td><td class="doc empty"> </td></tr><tr><td class="src"><span class="keyword">type</span> <a href="Servant-Server.html#t:Server">Server</a> (<a href="Servant-API-Get.html#t:Get">Get</a> result) = <a href="https://hackage.haskell.org/package/either-4.3.2/docs/Control-Monad-Trans-Either.html#t:EitherT">EitherT</a> (<a href="https://hackage.haskell.org/package/base-4.7.0.1/docs/Data-Int.html#t:Int">Int</a>, <a href="https://hackage.haskell.org/package/base-4.7.0.1/docs/Data-String.html#t:String">String</a>) <a href="https://hackage.haskell.org/package/base-4.7.0.1/docs/System-IO.html#t:IO">IO</a> result</td><td class="doc empty"> </td></tr></table></div></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.15.0</p></div></body></html> |