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-<h1 class="lined-header"><span>Hooks</span></h1>
-
-<div class="paragraph"><p>Hooks allow the user to customize Cowboy&#8217;s behavior during specific
-operations.</p></div>
-<div class="sect1">
-<h2 id="_onresponse">Onresponse</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>The <code>onresponse</code> hook is called right before sending the response
-to the socket. It can be used for the purposes of logging responses,
-or for modifying the response headers or body. The best example is
-providing custom error pages.</p></div>
-<div class="paragraph"><p>Note that this function MUST NOT crash. Cowboy may or may not send a
-reply if this function crashes. If a reply is sent, the hook MUST
-explicitly provide all headers that are needed.</p></div>
-<div class="paragraph"><p>You can specify the <code>onresponse</code> hook when creating the listener.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000000">cowboy:start_http</span></span>(<span style="color: #FF6600">my_http_listener</span>, <span style="color: #993399">100</span>,
- [{<span style="color: #FF6600">port</span>, <span style="color: #993399">8080</span>}],
- [
- {<span style="color: #FF6600">env</span>, [{<span style="color: #FF6600">dispatch</span>, <span style="color: #009900">Dispatch</span>}]},
- {<span style="color: #FF6600">onresponse</span>, <span style="font-weight: bold"><span style="color: #0000FF">fun</span></span> <span style="font-weight: bold"><span style="color: #000080">?MODULE</span></span><span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #000000">custom_404_hook</span></span><span style="color: #990000">/</span><span style="color: #993399">4</span>}
- ]
-)<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>The following hook function will provide a custom body for 404 errors
-when it has not been provided before, and will let Cowboy proceed with
-the default response otherwise.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000000">custom_404_hook</span></span>(<span style="color: #993399">404</span>, <span style="color: #009900">Headers</span>, <span style="color: #990000">&lt;&lt;&gt;&gt;</span>, <span style="color: #009900">Req</span>) <span style="color: #990000">-&gt;</span>
- <span style="color: #009900">Body</span> <span style="color: #990000">=</span> <span style="color: #990000">&lt;&lt;</span><span style="color: #FF0000">"404 Not Found."</span><span style="color: #990000">&gt;&gt;</span>,
- <span style="color: #009900">Headers2</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">lists:keyreplace</span></span>(<span style="color: #990000">&lt;&lt;</span><span style="color: #FF0000">"content-length"</span><span style="color: #990000">&gt;&gt;</span>, <span style="color: #993399">1</span>, <span style="color: #009900">Headers</span>,
- {<span style="color: #990000">&lt;&lt;</span><span style="color: #FF0000">"content-length"</span><span style="color: #990000">&gt;&gt;</span>, <span style="font-weight: bold"><span style="color: #000080">integer_to_list</span></span>(<span style="font-weight: bold"><span style="color: #000080">byte_size</span></span>(<span style="color: #009900">Body</span>))}),
- <span style="font-weight: bold"><span style="color: #000000">cowboy_req:reply</span></span>(<span style="color: #993399">404</span>, <span style="color: #009900">Headers2</span>, <span style="color: #009900">Body</span>, <span style="color: #009900">Req</span>);
-<span style="font-weight: bold"><span style="color: #000000">custom_404_hook</span></span>(<span style="color: #990000">_</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>, <span style="color: #009900">Req</span>) <span style="color: #990000">-&gt;</span>
- <span style="color: #009900">Req</span><span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>Again, make sure to always return the last request object obtained.</p></div>
-</div>
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- Cowboy
- 2.0
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- User Guide
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