Cowboy 2.4.0

author: Loïc Hoguin <[email protected]> 2018-05-02 11:35:26 +0200
committer: Loïc Hoguin <[email protected]> 2018-05-02 11:35:26 +0200
commit: fec98300ec9af6c8b5f3120a60f217983c451076 (patch)
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+
+<h1 class="lined-header"><span>cowboy_static(3)</span></h1>
+
+<div class="sect1">
+<h2 id="_name">Name</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>cowboy_static - Static file handler</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_description">Description</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The module <code>cowboy_static</code> implements file serving capabilities
+using the REST semantics provided by <code>cowboy_rest</code>.</p></div>
+<div class="paragraph"><p>The static file handler is a pre-written handler coming with
+Cowboy. To serve files, use it in your routes.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_options">Options</h2>
+<div class="sectionbody">
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight
+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">opts</span></span>() <span style="color: #990000">::</span> {<span style="color: #FF6600">priv_file</span>, <span style="color: #009900">App</span>, <span style="color: #009900">Path</span>}
+        | {<span style="color: #FF6600">priv_file</span>, <span style="color: #009900">App</span>, <span style="color: #009900">Path</span>, <span style="color: #009900">Extra</span>}
+        | {<span style="color: #FF6600">file</span>, <span style="color: #009900">Path</span>}
+        | {<span style="color: #FF6600">file</span>, <span style="color: #009900">Path</span>, <span style="color: #009900">Extra</span>}
+        | {<span style="color: #FF6600">priv_dir</span>, <span style="color: #009900">App</span>, <span style="color: #009900">Path</span>}
+        | {<span style="color: #FF6600">priv_dir</span>, <span style="color: #009900">App</span>, <span style="color: #009900">Path</span>, <span style="color: #009900">Extra</span>}
+        | {<span style="color: #FF6600">dir</span>, <span style="color: #009900">Path</span>}
+        | {<span style="color: #FF6600">dir</span>, <span style="color: #009900">Path</span>, <span style="color: #009900">Extra</span>}
+
+<span style="color: #009900">App</span>        <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">atom</span></span>()
+<span style="color: #009900">Path</span>       <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>() | <span style="font-weight: bold"><span style="color: #000000">string</span></span>()
+<span style="color: #009900">Extra</span>      <span style="color: #990000">::</span> [<span style="color: #009900">Etag</span> | <span style="color: #009900">Mimetypes</span>]
+
+<span style="color: #009900">Etag</span>       <span style="color: #990000">::</span> {<span style="color: #FF6600">etag</span>, <span style="font-weight: bold"><span style="color: #000000">module</span></span>(), <span style="font-weight: bold"><span style="color: #000080">function</span></span>()}
+            | {<span style="color: #FF6600">etag</span>, <span style="color: #000080">false</span>}
+
+<span style="color: #009900">Mimetypes</span>  <span style="color: #990000">::</span> {<span style="color: #FF6600">mimetypes</span>, <span style="font-weight: bold"><span style="color: #000000">module</span></span>(), <span style="font-weight: bold"><span style="color: #000080">function</span></span>()}
+            | {<span style="color: #FF6600">mimetypes</span>, <span style="font-weight: bold"><span style="color: #000080">binary</span></span>() | <span style="color: #009900">ParsedMime</span>}
+
+<span style="color: #009900">ParsedMime</span> <span style="color: #990000">::</span> {<span style="color: #009900">Type</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="color: #009900">SubType</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="color: #009900">Params</span>}
+<span style="color: #009900">Params</span>     <span style="color: #990000">::</span> [{<span style="color: #009900">Key</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="color: #009900">Value</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>()}]</tt></pre></div></div>
+<div class="paragraph"><p>Static handler configuration.</p></div>
+<div class="dlist"><dl>
+<dt class="hdlist1">
+priv_file
+</dt>
+<dd>
+<p>
+Send a file.
+</p>
+<div class="paragraph"><p>The path is relative to the given application&#8217;s private
+directory.</p></div>
+</dd>
+<dt class="hdlist1">
+file
+</dt>
+<dd>
+<p>
+Send a file.
+</p>
+<div class="paragraph"><p>The path is either absolute or relative to the Erlang node&#8217;s
+current directory.</p></div>
+</dd>
+<dt class="hdlist1">
+priv_dir
+</dt>
+<dd>
+<p>
+Recursively serve files from a directory.
+</p>
+<div class="paragraph"><p>The path is relative to the given application&#8217;s private
+directory.</p></div>
+</dd>
+<dt class="hdlist1">
+dir
+</dt>
+<dd>
+<p>
+Recursively serve files from a directory.
+</p>
+<div class="paragraph"><p>The path is either absolute or relative to the Erlang node&#8217;s
+current directory.</p></div>
+</dd>
+</dl></div>
+<div class="paragraph"><p>The extra options allow you to define how the etag should be
+calculated and how the MIME type of files should be detected.</p></div>
+<div class="paragraph"><p>By default the static handler will generate an etag based
+on the size and modification time of the file. You may disable
+the etag entirely with <code>{etag, false}</code> or provide a module
+and function that will be called when needed:</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight
+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">generate_etag</span></span>(<span style="color: #009900">Path</span>, <span style="color: #009900">Size</span>, <span style="color: #009900">Mtime</span>) <span style="color: #990000">-&gt;</span> {<span style="color: #FF6600">strong</span> | <span style="color: #FF6600">weak</span>, <span style="font-weight: bold"><span style="color: #000080">binary</span></span>()}
+
+<span style="color: #009900">Path</span>  <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>()
+<span style="color: #009900">Size</span>  <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">non_neg_integer</span></span>()
+<span style="color: #009900">Mtime</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">file:date_time</span></span>()</tt></pre></div></div>
+<div class="paragraph"><p>By default the static handler will detect Web-related MIME types
+by looking at the file extension. You can provide a specific
+MIME type that will always be used, or a module and function that
+will be called when needed:</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight
+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">detect_mimetype</span></span>(<span style="color: #009900">Path</span>) <span style="color: #990000">-&gt;</span> <span style="color: #009900">ParsedMime</span>
+
+<span style="color: #009900">Path</span>       <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>()
+<span style="color: #009900">ParsedMime</span> <span style="color: #990000">::</span> {<span style="color: #009900">Type</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="color: #009900">SubType</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="color: #009900">Params</span>}
+<span style="color: #009900">Params</span>     <span style="color: #990000">::</span> [{<span style="color: #009900">Key</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="color: #009900">Value</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>()}]</tt></pre></div></div>
+<div class="paragraph"><p>Cowboy comes with two such functions; the default function
+<code>cow_mimetypes:web/1</code>, and a second function generated from
+the Apache <em>mime.types</em> file, <code>cow_mimetypes:all/1</code>.</p></div>
+<div class="paragraph"><p>The MIME type function should return
+<code>{&lt;&lt;"application"&gt;&gt;, &lt;&lt;"octet-stream"&gt;&gt;, []}</code>
+when it fails to detect a file&#8217;s MIME type.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_changelog">Changelog</h2>
+<div class="sectionbody">
+<div class="ulist"><ul>
+<li>
+<p>
+<strong>1.0</strong>: Handler introduced.
+</p>
+</li>
+</ul></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_examples">Examples</h2>
+<div class="sectionbody">
+<div class="listingblock">
+<div class="title">Custom etag function</div>
+<div class="content"><!-- Generator: GNU source-highlight
+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">generate_etag</span></span>(<span style="color: #009900">Path</span>, <span style="color: #009900">Size</span>, <span style="color: #009900">Mtime</span>) <span style="color: #990000">-&gt;</span>
+    {<span style="color: #FF6600">strong</span>, <span style="font-weight: bold"><span style="color: #000000">integer_to_binary</span></span>(
+        <span style="font-weight: bold"><span style="color: #000000">erlang:phash2</span></span>({<span style="color: #009900">Path</span>, <span style="color: #009900">Size</span>, <span style="color: #009900">Mtime</span>}, <span style="color: #993399">16#ffffffff</span>))}<span style="color: #990000">.</span></tt></pre></div></div>
+<div class="listingblock">
+<div class="title">Custom MIME type function</div>
+<div class="content"><!-- Generator: GNU source-highlight
+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">always_octet_stream</span></span>(<span style="color: #009900">_Path</span>) <span style="color: #990000">-&gt;</span>
+    <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> <span style="font-weight: bold"><span style="color: #000000">filename:extension</span></span>(<span style="color: #009900">Path</span>) <span style="font-weight: bold"><span style="color: #0000FF">of</span></span>
+        <span style="color: #990000">&lt;&lt;</span><span style="color: #FF0000">".erl"</span><span style="color: #990000">&gt;&gt;</span> <span style="color: #990000">-&gt;</span> {<span style="color: #990000">&lt;&lt;</span><span style="color: #FF0000">"text"</span><span style="color: #990000">&gt;&gt;</span>, <span style="color: #990000">&lt;&lt;</span><span style="color: #FF0000">"plain"</span><span style="color: #990000">&gt;&gt;</span>, []};
+        <span style="color: #990000">_</span> <span style="color: #990000">-&gt;</span> {<span style="color: #990000">&lt;&lt;</span><span style="color: #FF0000">"application"</span><span style="color: #990000">&gt;&gt;</span>, <span style="color: #990000">&lt;&lt;</span><span style="color: #FF0000">"octet-stream"</span><span style="color: #990000">&gt;&gt;</span>, []}
+    <span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">.</span></tt></pre></div></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_see_also">See also</h2>
+<div class="sectionbody">
+<div class="paragraph"><p><a href="..">cowboy(7)</a>,
+<a href="../cowboy_router">cowboy_router(3)</a></p></div>
+</div>
+</div>
+
+
+
+
+
+</div>
+
+<div class="span3 sidecol">
+
+
+<h3>
+	Cowboy
+	2.4
+	Function Reference
+	
+</h3>
+
+<ul>
+	
+		<li><a href="/docs/en/cowboy/2.4/guide">User Guide</a></li>
+	
+	
+		<li><a href="/docs/en/cowboy/2.4/manual">Function Reference</a></li>
+	
+	
+</ul>
+
+<h4 id="docs-nav">Navigation</h4>
+
+<h4>Version select</h4>
+<ul>
+	
+	
+	
+		<li><a href="/docs/en/cowboy/2.4/manual">2.4</a></li>
+	
+		<li><a href="/docs/en/cowboy/2.3/manual">2.3</a></li>
+	
+		<li><a href="/docs/en/cowboy/2.2/manual">2.2</a></li>
+	
+		<li><a href="/docs/en/cowboy/2.1/manual">2.1</a></li>
+	
+		<li><a href="/docs/en/cowboy/2.0/manual">2.0</a></li>
+	
+		<li><a href="/docs/en/cowboy/1.0/manual">1.0</a></li>
+	
+</ul>
+
+</div>
+</div>
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author	Loïc Hoguin <[email protected]>	2018-05-02 11:35:26 +0200
committer	Loïc Hoguin <[email protected]>	2018-05-02 11:35:26 +0200
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