Cowboy 2.13.0

author: Loïc Hoguin <[email protected]> 2025-02-18 09:51:22 +0100
committer: Loïc Hoguin <[email protected]> 2025-02-18 09:51:22 +0100
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+<h1 class="lined-header"><span>cowboy_req:parse_qs(3)</span></h1>
+
+<h2 id="_name">Name</h2>
+<p>cowboy_req:parse_qs - Parse the query string</p>
+<h2 id="_description">Description</h2>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><b><font color="#000000">parse_qs</font></b>(<font color="#009900">Req</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:req</font></b>())
+    <font color="#990000">-&gt;</font> [{<font color="#009900">Key</font> <font color="#990000">::</font> <b><font color="#000080">binary</font></b>(), <font color="#009900">Value</font> <font color="#990000">::</font> <b><font color="#000080">binary</font></b>() | <font color="#000080">true</font>}]</tt></pre>
+</div></div>
+<p>Parse the query string as a list of key/value pairs.</p>
+<h2 id="_arguments">Arguments</h2>
+<dl><dt>Req</dt>
+<dd><p>The Req object.</p>
+</dd>
+</dl>
+<h2 id="_return_value">Return value</h2>
+<p>The parsed query string is returned as a list of key/value pairs. The key is a binary string. The value is either a binary string, or the atom <code>true</code>. Both key and value are case sensitive.</p>
+<p>The atom <code>true</code> is returned when a key is present in the query string without a value. For example, in the following URIs the key <code>&lt;&lt;&quot;edit&quot;&gt;&gt;</code> will always have the value <code>true</code>:</p>
+<ul><li><code>/posts/42?edit</code>
+</li>
+<li><code>/posts/42?edit&amp;exclusive=1</code>
+</li>
+<li><code>/posts/42?exclusive=1&amp;edit</code>
+</li>
+<li><code>/posts/42?exclusive=1&amp;edit&amp;from=web</code>
+</li>
+</ul>
+<h2 id="_changelog">Changelog</h2>
+<ul><li><strong>2.0</strong>: The parsed value is not longer cached in the Req object.
+</li>
+<li><strong>2.0</strong>: Only the parsed query string is returned, it is no longer wrapped in a tuple.
+</li>
+<li><strong>2.0</strong>: Function introduced. Replaces <code>qs_val/1</code> and <code>qs_vals/1</code>.
+</li>
+</ul>
+<h2 id="_examples">Examples</h2>
+<div class="listingblock"><div class="title">Parse the query string and convert the keys to atoms</div>
+<div class="content"><!-- Generator: GNU source-highlight 3.1.9
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><font color="#009900">ParsedQs</font> <font color="#990000">=</font> <b><font color="#000000">cowboy_req:parse_qs</font></b>(<font color="#009900">Req</font>),
+<font color="#009900">AtomsQs</font> <font color="#990000">=</font> [{<b><font color="#000000">binary_to_existing_atom</font></b>(<font color="#009900">K</font>, <font color="#FF6600">latin1</font>), <font color="#009900">V</font>}
+    || {<font color="#009900">K</font>, <font color="#009900">V</font>} <font color="#990000">&lt;-</font> <font color="#009900">ParsedQs</font>]<font color="#990000">.</font></tt></pre>
+</div></div>
+<h2 id="_see_also">See also</h2>
+<p><a href="../cowboy_req">cowboy_req(3)</a>, <a href="../cowboy_req.qs">cowboy_req:qs(3)</a>, <a href="../cowboy_req.match_qs">cowboy_req:match_qs(3)</a></p>
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author	Loïc Hoguin <[email protected]>	2025-02-18 09:51:22 +0100
committer	Loïc Hoguin <[email protected]>	2025-02-18 09:51:22 +0100
commit	25e93c91878b7f8536764b06d2cb72020031acd1 (patch)
tree	b8da36ff9d9d2372c0f1f046262670326740bdfc /docs/en/cowboy/2.13/manual/cowboy_req.parse_qs/index.html
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