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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’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’s heading host segments
</p>
</li>
<li>
<p>
<a href="../cowboy_req.path_info">cowboy_req:path_info(3)</a> - Access the route’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’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.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 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">push_opts</span></span>() <span style="color: #990000">::</span> #{
<span style="color: #0000FF">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: #0000FF">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: #0000FF">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: #0000FF">port</span> <span style="color: #990000">=></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">=></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’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 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">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">=></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">=></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">=></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 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">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’t and shouldn’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 3.1.8
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">=></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 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">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 3.1.8
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">></span> <span style="color: #009900">RespBody</span> <span style="color: #990000">=</span> [<span style="color: #FF0000">"Hello "</span>, [<span style="color: #990000"><<</span><span style="color: #FF0000">"world"</span><span style="color: #990000">>></span>, <span style="color: #FF0000">$!</span>]]<span style="color: #990000">.</span>
[<span style="color: #FF0000">"Hello "</span>,[<span style="color: #990000"><<</span><span style="color: #FF0000">"world"</span><span style="color: #990000">>></span>,<span style="color: #993399">33</span>]]
<span style="color: #993399">2</span><span style="color: #990000">></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
2.1
Function Reference
</h3>
<ul>
<li><a href="/docs/en/cowboy/2.1/guide">User Guide</a></li>
<li><a href="/docs/en/cowboy/2.1/manual">Function Reference</a></li>
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<h4 id="docs-nav">Navigation</h4>
<h4>Version select</h4>
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<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>
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