Cowboy 2.4.0

author: Loïc Hoguin <[email protected]> 2018-05-02 11:35:26 +0200
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+
+<h1 class="lined-header"><span>cowboy_req(3)</span></h1>
+
+<div class="sect1">
+<h2 id="_name">Name</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>cowboy_req - HTTP request and response</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_description">Description</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The module <code>cowboy_req</code> provides functions to access, manipulate
+and respond to requests.</p></div>
+<div class="paragraph"><p>There are four types of functions in this module. They can be
+differentiated by their name and their return type:</p></div>
+<div class="tableblock">
+<table rules="all"
+width="100%"
+frame="border"
+cellspacing="0" cellpadding="4">
+<col width="33%" />
+<col width="33%" />
+<col width="33%" />
+<thead>
+<tr>
+<th align="left" valign="top"> Type         </th>
+<th align="left" valign="top"> Name pattern              </th>
+<th align="left" valign="top"> Return type</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td align="left" valign="top"><p class="table">access</p></td>
+<td align="left" valign="top"><p class="table">no verb, parse_*, match_*</p></td>
+<td align="left" valign="top"><p class="table"><code>Value</code></p></td>
+</tr>
+<tr>
+<td align="left" valign="top"><p class="table">question</p></td>
+<td align="left" valign="top"><p class="table">has_*</p></td>
+<td align="left" valign="top"><p class="table"><code>boolean()</code></p></td>
+</tr>
+<tr>
+<td align="left" valign="top"><p class="table">modification</p></td>
+<td align="left" valign="top"><p class="table">set_*</p></td>
+<td align="left" valign="top"><p class="table"><code>Req</code></p></td>
+</tr>
+<tr>
+<td align="left" valign="top"><p class="table">action</p></td>
+<td align="left" valign="top"><p class="table">any other verb</p></td>
+<td align="left" valign="top"><p class="table"><code>ok | {Result, Value, Req}</code></p></td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="paragraph"><p>Any <code>Req</code> returned must be used in place of the one passed as
+argument. Functions that perform an action in particular write
+state in the Req object to make sure you are using the function
+correctly. For example, it&#8217;s only possible to send one response,
+and to read the body once.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_exports">Exports</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Connection:</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+<a href="../cowboy_req.peer">cowboy_req:peer(3)</a> - Peer address and port
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.sock">cowboy_req:sock(3)</a> - Socket address and port
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.cert">cowboy_req:cert(3)</a> - Client TLS certificate
+</p>
+</li>
+</ul></div>
+<div class="paragraph"><p>Raw request:</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+<a href="../cowboy_req.method">cowboy_req:method(3)</a> - HTTP method
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.version">cowboy_req:version(3)</a> - HTTP version
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.scheme">cowboy_req:scheme(3)</a> - URI scheme
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.host">cowboy_req:host(3)</a> - URI host name
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.port">cowboy_req:port(3)</a> - URI port number
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.path">cowboy_req:path(3)</a> - URI path
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.qs">cowboy_req:qs(3)</a> - URI query string
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.uri">cowboy_req:uri(3)</a> - Reconstructed URI
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.header">cowboy_req:header(3)</a> - HTTP header
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.headers">cowboy_req:headers(3)</a> - HTTP headers
+</p>
+</li>
+</ul></div>
+<div class="paragraph"><p>Processed request:</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+<a href="../cowboy_req.parse_qs">cowboy_req:parse_qs(3)</a> - Parse the query string
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.match_qs">cowboy_req:match_qs(3)</a> - Match the query string against constraints
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.parse_header">cowboy_req:parse_header(3)</a> - Parse the given HTTP header
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.parse_cookies">cowboy_req:parse_cookies(3)</a> - Parse cookie headers
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.match_cookies">cowboy_req:match_cookies(3)</a> - Match cookies against constraints
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.binding">cowboy_req:binding(3)</a> - Access a value bound from the route
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.bindings">cowboy_req:bindings(3)</a> - Access all values bound from the route
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.host_info">cowboy_req:host_info(3)</a> - Access the route&#8217;s heading host segments
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.path_info">cowboy_req:path_info(3)</a> - Access the route&#8217;s trailing path segments
+</p>
+</li>
+</ul></div>
+<div class="paragraph"><p>Request body:</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+<a href="../cowboy_req.has_body">cowboy_req:has_body(3)</a> - Is there a request body?
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.body_length">cowboy_req:body_length(3)</a> - Body length
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.read_body">cowboy_req:read_body(3)</a> - Read the request body
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.read_urlencoded_body">cowboy_req:read_urlencoded_body(3)</a> - Read and parse a urlencoded request body
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.read_part">cowboy_req:read_part(3)</a> - Read the next multipart headers
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.read_part_body">cowboy_req:read_part_body(3)</a> - Read the current part&#8217;s body
+</p>
+</li>
+</ul></div>
+<div class="paragraph"><p>Response:</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+<a href="../cowboy_req.set_resp_cookie">cowboy_req:set_resp_cookie(3)</a> - Set a cookie
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.set_resp_header">cowboy_req:set_resp_header(3)</a> - Set a response header
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.set_resp_headers">cowboy_req:set_resp_headers(3)</a> - Set several response headers
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.has_resp_header">cowboy_req:has_resp_header(3)</a> - Is the given response header set?
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.resp_header">cowboy_req:resp_header(3)</a> - Response header
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.resp_headers">cowboy_req:resp_headers(3)</a> - Response headers
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.delete_resp_header">cowboy_req:delete_resp_header(3)</a> - Delete a response header
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.set_resp_body">cowboy_req:set_resp_body(3)</a> - Set the response body
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.has_resp_body">cowboy_req:has_resp_body(3)</a> - Is there a response body?
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.inform">cowboy_req:inform(3)</a> - Send an informational response
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.reply">cowboy_req:reply(3)</a> - Send the response
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.stream_reply">cowboy_req:stream_reply(3)</a> - Send the response headers
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.stream_body">cowboy_req:stream_body(3)</a> - Stream the response body
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.stream_trailers">cowboy_req:stream_trailers(3)</a> - Send the response trailers
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_req.push">cowboy_req:push(3)</a> - Push a resource to the client
+</p>
+</li>
+</ul></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_types">Types</h2>
+<div class="sectionbody">
+<div class="sect2">
+<h3 id="_push_opts">push_opts()</h3>
+<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">push_opts</span></span>() <span style="color: #990000">::</span> #{
+    <span style="color: #0000FF">method</span> <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(),            <span style="font-style: italic"><span style="color: #9A1900">%% case sensitive</span></span>
+    <span style="color: #0000FF">scheme</span> <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(),            <span style="font-style: italic"><span style="color: #9A1900">%% lowercase; case insensitive</span></span>
+    <span style="color: #0000FF">host</span>   <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(),            <span style="font-style: italic"><span style="color: #9A1900">%% lowercase; case insensitive</span></span>
+    <span style="color: #0000FF">port</span>   <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000000">inet:port_number</span></span>(),
+    <span style="color: #0000FF">qs</span>     <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>()             <span style="font-style: italic"><span style="color: #9A1900">%% case sensitive</span></span>
+}</tt></pre></div></div>
+<div class="paragraph"><p>Push options.</p></div>
+<div class="paragraph"><p>By default, Cowboy will use the GET method, an empty query string,
+and take the scheme, host and port directly from the current
+request&#8217;s URI.</p></div>
+</div>
+<div class="sect2">
+<h3 id="_read_body_opts">read_body_opts()</h3>
+<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">read_body_opts</span></span>() <span style="color: #990000">::</span> #{
+    <span style="font-weight: bold"><span style="color: #000080">length</span></span>  <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000000">non_neg_integer</span></span>(),
+    <span style="color: #0000FF">period</span>  <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000000">non_neg_integer</span></span>(),
+    <span style="color: #0000FF">timeout</span> <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000000">timeout</span></span>()
+}</tt></pre></div></div>
+<div class="paragraph"><p>Body reading options.</p></div>
+<div class="paragraph"><p>The defaults are function-specific.</p></div>
+</div>
+<div class="sect2">
+<h3 id="_req">req()</h3>
+<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">req</span></span>() <span style="color: #990000">::</span> #{
+    <span style="color: #FF6600">method</span>  <span style="color: #990000">:=</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(),               <span style="font-style: italic"><span style="color: #9A1900">%% case sensitive</span></span>
+    <span style="color: #FF6600">version</span> <span style="color: #990000">:=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy:http_version</span></span>() | <span style="font-weight: bold"><span style="color: #000080">atom</span></span>(),
+    <span style="color: #FF6600">scheme</span>  <span style="color: #990000">:=</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(),               <span style="font-style: italic"><span style="color: #9A1900">%% lowercase; case insensitive</span></span>
+    <span style="color: #FF6600">host</span>    <span style="color: #990000">:=</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(),               <span style="font-style: italic"><span style="color: #9A1900">%% lowercase; case insensitive</span></span>
+    <span style="color: #FF6600">port</span>    <span style="color: #990000">:=</span> <span style="font-weight: bold"><span style="color: #000000">inet:port_number</span></span>(),
+    <span style="color: #FF6600">path</span>    <span style="color: #990000">:=</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(),               <span style="font-style: italic"><span style="color: #9A1900">%% case sensitive</span></span>
+    <span style="color: #FF6600">qs</span>      <span style="color: #990000">:=</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(),               <span style="font-style: italic"><span style="color: #9A1900">%% case sensitive</span></span>
+    <span style="color: #FF6600">headers</span> <span style="color: #990000">:=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy:http_headers</span></span>(),
+    <span style="color: #FF6600">peer</span>    <span style="color: #990000">:=</span> {<span style="font-weight: bold"><span style="color: #000000">inet:ip_address</span></span>(), <span style="font-weight: bold"><span style="color: #000000">inet:port_number</span></span>()},
+    <span style="color: #FF6600">sock</span>    <span style="color: #990000">:=</span> {<span style="font-weight: bold"><span style="color: #000000">inet:ip_address</span></span>(), <span style="font-weight: bold"><span style="color: #000000">inet:port_number</span></span>()},
+    <span style="color: #FF6600">cert</span>    <span style="color: #990000">:=</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>() | <span style="color: #000080">undefined</span>
+}</tt></pre></div></div>
+<div class="paragraph"><p>The Req object.</p></div>
+<div class="paragraph"><p>Contains information about the request and response. While
+some fields are publicly documented, others aren&#8217;t and shouldn&#8217;t
+be used.</p></div>
+<div class="paragraph"><p>You may add custom fields if required. Make sure to namespace
+them by prepending an underscore and the name of your application:</p></div>
+<div class="listingblock">
+<div class="title">Setting a custom field</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="color: #009900">Req</span>#{<span style="color: #009900">_myapp_auth_method</span> <span style="color: #990000">=&gt;</span> <span style="color: #FF6600">pubkey</span>}<span style="color: #990000">.</span></tt></pre></div></div>
+</div>
+<div class="sect2">
+<h3 id="_resp_body">resp_body()</h3>
+<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">resp_body</span></span>() <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">iodata</span></span>()
+    | {<span style="color: #FF6600">sendfile</span>, <span style="color: #009900">Offset</span>, <span style="color: #009900">Length</span>, <span style="color: #009900">Filename</span>}
+
+<span style="color: #009900">Offset</span>   <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">non_neg_integer</span></span>()
+<span style="color: #009900">Length</span>   <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">non_neg_integer</span></span>()
+<span style="color: #009900">Filename</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">file:name_all</span></span>()</tt></pre></div></div>
+<div class="paragraph"><p>Response body.</p></div>
+<div class="paragraph"><p>It can take two forms: the actual data to be sent or a
+tuple indicating which file to send.</p></div>
+<div class="paragraph"><p>When sending data directly, the type is either a binary or
+an iolist. Iolists are an efficient way to build output.
+Instead of concatenating strings or binaries, you can simply
+build a list containing the fragments you want to send in the
+order they should be sent:</p></div>
+<div class="listingblock">
+<div class="title">Example iolists usage</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="color: #993399">1</span><span style="color: #990000">&gt;</span> <span style="color: #009900">RespBody</span> <span style="color: #990000">=</span> [<span style="color: #FF0000">"Hello "</span>, [<span style="color: #990000">&lt;&lt;</span><span style="color: #FF0000">"world"</span><span style="color: #990000">&gt;&gt;</span>, <span style="color: #FF0000">$!</span>]]<span style="color: #990000">.</span>
+[<span style="color: #FF0000">"Hello "</span>,[<span style="color: #990000">&lt;&lt;</span><span style="color: #FF0000">"world"</span><span style="color: #990000">&gt;&gt;</span>,<span style="color: #993399">33</span>]]
+<span style="color: #993399">2</span><span style="color: #990000">&gt;</span> <span style="font-weight: bold"><span style="color: #000000">io:format</span></span>(<span style="color: #FF0000">"~s~n"</span>, [<span style="color: #009900">RespBody</span>])<span style="color: #990000">.</span>
+<span style="color: #009900">Hello</span> <span style="color: #FF6600">world</span><span style="color: #990000">!</span></tt></pre></div></div>
+<div class="paragraph"><p>Note that the length must be greater than zero for any data
+to be sent. Cowboy will send an empty body when the length
+is zero.</p></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></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>
+</div>
+</div>
+
+      <footer>
+        <div class="container">
+          <div class="row">
+            <div class="span6">
+              <p id="scroll-top"><a href="#">↑ Scroll to top</a></p>
+              <nav>
+                <ul>
+                  <li><a href="mailto:[email protected]" title="Contact us">Contact us</a></li><li><a href="https://github.com/ninenines/ninenines.github.io" title="Github repository">Contribute to this site</a></li>
+                </ul>
+              </nav>
+            </div>
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+               <p><img src="/img/footer_logo.png"></p>
+               <p>Copyright &copy; Loïc Hoguin 2012-2018</p>
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+
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+</html>
+
+
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)
tree	9772977293124e8b9b5b253e44d8c2695cddfb44 /docs/en/cowboy/2.4/manual/cowboy_req/index.html
parent	bfd2b6e01cbb36b0be0b3c860f5baf8d5b49fe7a (diff)
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