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author | Loïc Hoguin <[email protected]> | 2018-10-03 09:58:55 +0200 |
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committer | Loïc Hoguin <[email protected]> | 2018-10-03 09:58:55 +0200 |
commit | 441272421acfae86d3605e1533e0f5f3b9c2b1c3 (patch) | |
tree | c1ba9695781db03f580f0891c55fbdc0e4dd0b99 /docs/en/cowboy/2.5/manual/cowboy_req.read_part | |
parent | 107ae204f12f38b78de8c2b1240fbc9709b50c83 (diff) | |
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Cowboy 2.5.0
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diff --git a/docs/en/cowboy/2.5/manual/cowboy_req.read_part/index.html b/docs/en/cowboy/2.5/manual/cowboy_req.read_part/index.html new file mode 100644 index 00000000..c311332b --- /dev/null +++ b/docs/en/cowboy/2.5/manual/cowboy_req.read_part/index.html @@ -0,0 +1,232 @@ +<!DOCTYPE html> +<html lang="en"> + +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + <meta name="description" content=""> + <meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara"> + + <title>Nine Nines: cowboy_req:read_part(3)</title> + + <link href='https://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic' rel='stylesheet' type='text/css'> + <link href="/css/99s.css?r=2" rel="stylesheet"> + + <link rel="shortcut icon" href="/img/ico/favicon.ico"> + <link rel="apple-touch-icon-precomposed" sizes="114x114" href="/img/ico/apple-touch-icon-114.png"> + <link rel="apple-touch-icon-precomposed" sizes="72x72" href="/img/ico/apple-touch-icon-72.png"> + <link rel="apple-touch-icon-precomposed" href="/img/ico/apple-touch-icon-57.png"> + + +</head> + + +<body class=""> + <header id="page-head"> + <div id="topbar" class="container"> + <div class="row"> + <div class="span2"> + <h1 id="logo"><a href="/" title="99s">99s</a></h1> + </div> + <div class="span10"> + + <div id="side-header"> + <nav> + <ul> + <li><a title="Hear my thoughts" href="/articles">Articles</a></li> + <li><a title="Watch my talks" href="/talks">Talks</a></li> + <li class="active"><a title="Read the docs" href="/docs">Documentation</a></li> + <li><a title="Request my services" href="/services">Consulting & Training</a></li> + </ul> + </nav> + <ul id="social"> + <li> + <a href="https://github.com/ninenines" title="Check my Github repositories"><img src="/img/ico_github.png" data-hover="/img/ico_github_alt.png" alt="Github"></a> + </li> + <li> + <a title="Contact me" href="mailto:[email protected]"><img src="/img/ico_mail.png" data-hover="/img/ico_mail_alt.png"></a> + </li> + </ul> + </div> + </div> + </div> + </div> + + +</header> + +<div id="contents" class="two_col"> +<div class="container"> +<div class="row"> +<div id="docs" class="span9 maincol"> + +<h1 class="lined-header"><span>cowboy_req:read_part(3)</span></h1> + +<h2 id="_name">Name</h2> +<p>cowboy_req:read_part - Read the next multipart headers</p> +<h2 id="_description">Description</h2> +<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><b><font color="#000000">read_part</font></b>(<font color="#009900">Req</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:req</font></b>()) + <font color="#990000">-></font> <b><font color="#000000">read_part</font></b>(<font color="#009900">Req</font>, #{}) + +<b><font color="#000000">read_part</font></b>(<font color="#009900">Req</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:req</font></b>(), <font color="#009900">Opts</font>) + <font color="#990000">-></font> {<font color="#FF6600">ok</font>, <font color="#009900">Headers</font>, <font color="#009900">Req</font>} | {<font color="#FF6600">done</font>, <font color="#009900">Req</font>} + +<font color="#009900">Opts</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:read_body_opts</font></b>() +<font color="#009900">Headers</font> <font color="#990000">::</font> #{<b><font color="#000080">binary</font></b>() <font color="#990000">=></font> <b><font color="#000080">binary</font></b>()}</tt></pre> +</div></div> +<p>Read the next part of a multipart body.</p> +<p>This function reads the request body and parses it as multipart. Each parts of a multipart representation have their own headers and body. This function parses and returns headers. Examples of multipart media types are <code>multipart/form-data</code> and <code>multipart/byteranges</code>.</p> +<p>Cowboy will skip any data remaining until the beginning of the next part. This includes the preamble to the multipart message but also the body of a previous part if it hasn't been read. Both are skipped automatically when calling this function.</p> +<p>Cowboy will read the body before parsing in chunks of size up to 64KB, with a period of 5 seconds. This is tailored for reading part headers and might not be the most efficient for skipping the previous part's body.</p> +<p>The headers returned are MIME headers, <strong>NOT</strong> HTTP headers. They can be parsed using the functions from the <code>cow_multipart</code> module. In addition, the <code>cow_multipart:form_data/1</code> function can be used to quickly extract information from <code>multipart/form-data</code> representations.</p> +<!-- @todo Proper link to cow_multipart:form_data.--> +<p>Once a part has been read, it can not be read again.</p> +<p>Once the body has been read, Cowboy sets the content-length header if it was not previously provided.</p> +<!-- @todo Limit the maximum size of multipart headers.--> +<h2 id="_arguments">Arguments</h2> +<dl><dt>Req</dt> +<dd><p>The Req object.</p> +</dd> +<dt>Opts</dt> +<dd><p>A map of body reading options. Please refer to <a href="../cowboy_req.read_body">cowboy_req:read_body(3)</a> for details about each option.</p> +<p>This function defaults the <code>length</code> to 64KB and the <code>period</code> to 5 seconds.</p> +</dd> +</dl> +<h2 id="_return_value">Return value</h2> +<p>An <code>ok</code> tuple is returned containing the next part's headers as a map.</p> +<p>A <code>done</code> tuple is returned if there are no more parts to read.</p> +<p>The Req object returned in the tuple must be used from that point onward. It contains a more up to date representation of the request. For example it may have an added content-length header once the body has been read.</p> +<h2 id="_changelog">Changelog</h2> +<ul><li><strong>2.0</strong>: Function introduced. Replaces <code>part/1,2</code>. +</li> +</ul> +<h2 id="_examples">Examples</h2> +<div class="listingblock"><div class="title">Read all parts</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><b><font color="#000000">acc_multipart</font></b>(<font color="#009900">Req0</font>, <font color="#009900">Acc</font>) <font color="#990000">-></font> + <b><font color="#0000FF">case</font></b> <b><font color="#000000">cowboy_req:read_part</font></b>(<font color="#009900">Req0</font>) <b><font color="#0000FF">of</font></b> + {<font color="#FF6600">ok</font>, <font color="#009900">Headers</font>, <font color="#009900">Req1</font>} <font color="#990000">-></font> + {<font color="#FF6600">ok</font>, <font color="#009900">Body</font>, <font color="#009900">Req</font>} <font color="#990000">=</font> <b><font color="#000000">stream_body</font></b>(<font color="#009900">Req1</font>, <font color="#990000"><<>></font>), + <b><font color="#000000">acc_multipart</font></b>(<font color="#009900">Req</font>, [{<font color="#009900">Headers</font>, <font color="#009900">Body</font>}|<font color="#009900">Acc</font>]); + {<font color="#FF6600">done</font>, <font color="#009900">Req</font>} <font color="#990000">-></font> + {<b><font color="#000000">lists:reverse</font></b>(<font color="#009900">Acc</font>), <font color="#009900">Req</font>} + <b><font color="#0000FF">end</font></b><font color="#990000">.</font> + +<b><font color="#000000">stream_body</font></b>(<font color="#009900">Req0</font>, <font color="#009900">Acc</font>) <font color="#990000">-></font> + <b><font color="#0000FF">case</font></b> <b><font color="#000000">cowboy_req:read_part_body</font></b>(<font color="#009900">Req0</font>) <b><font color="#0000FF">of</font></b> + {<font color="#FF6600">more</font>, <font color="#009900">Data</font>, <font color="#009900">Req</font>} <font color="#990000">-></font> + <b><font color="#000000">stream_body</font></b>(<font color="#009900">Req</font>, <font color="#990000"><<</font> <font color="#009900">Acc</font><font color="#990000">/</font><b><font color="#000080">binary</font></b>, <font color="#009900">Data</font><font color="#990000">/</font><b><font color="#000080">binary</font></b> <font color="#990000">>></font>); + {<font color="#FF6600">ok</font>, <font color="#009900">Data</font>, <font color="#009900">Req</font>} <font color="#990000">-></font> + {<font color="#FF6600">ok</font>, <font color="#990000"><<</font> <font color="#009900">Acc</font><font color="#990000">/</font><b><font color="#000080">binary</font></b>, <font color="#009900">Data</font><font color="#990000">/</font><b><font color="#000080">binary</font></b> <font color="#990000">>></font>, <font color="#009900">Req</font>} + <b><font color="#0000FF">end</font></b><font color="#990000">.</font></tt></pre> +</div></div> +<div class="listingblock"><div class="title">Read all part headers, skipping bodies</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><b><font color="#000000">skip_body_multipart</font></b>(<font color="#009900">Req0</font>, <font color="#009900">Acc</font>) <font color="#990000">-></font> + <b><font color="#0000FF">case</font></b> <b><font color="#000000">cowboy_req:read_part</font></b>(<font color="#009900">Req0</font>) <b><font color="#0000FF">of</font></b> + {<font color="#FF6600">ok</font>, <font color="#009900">Headers</font>, <font color="#009900">Req</font>} <font color="#990000">-></font> + <b><font color="#000000">skip_body_multipart</font></b>(<font color="#009900">Req</font>, [<font color="#009900">Headers</font>|<font color="#009900">Acc</font>]); + {<font color="#FF6600">done</font>, <font color="#009900">Req</font>} <font color="#990000">-></font> + {<b><font color="#000000">lists:reverse</font></b>(<font color="#009900">Acc</font>), <font color="#009900">Req</font>} + <b><font color="#0000FF">end</font></b><font color="#990000">.</font></tt></pre> +</div></div> +<div class="listingblock"><div class="title">Read a part header in larger chunks</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>{<font color="#FF6600">ok</font>, <font color="#009900">Headers</font>, <font color="#009900">Req</font>} <font color="#990000">=</font> <b><font color="#000000">cowboy_req:read_part</font></b>(<font color="#009900">Req0</font>, #{<b><font color="#000080">length</font></b> <font color="#990000">=></font> <font color="#993399">1000000</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.has_body">cowboy_req:has_body(3)</a>, <a href="../cowboy_req.body_length">cowboy_req:body_length(3)</a>, <a href="../cowboy_req.read_body">cowboy_req:read_body(3)</a>, <a href="../cowboy_req.read_urlencoded_body">cowboy_req:read_urlencoded_body(3)</a>, <a href="../cowboy_req.read_and_match_urlencoded_body">cowboy_req:read_and_match_urlencoded_body(3)</a>, <a href="../cowboy_req.read_part_body">cowboy_req:read_part_body(3)</a></p> + + + + + + +</div> + +<div class="span3 sidecol"> + + +<h3> + Cowboy + 2.5 + Function Reference + +</h3> + +<ul> + + <li><a href="/docs/en/cowboy/2.5/guide">User Guide</a></li> + + + <li><a href="/docs/en/cowboy/2.5/manual">Function Reference</a></li> + + +</ul> + +<h4 id="docs-nav">Navigation</h4> + +<h4>Version select</h4> +<ul> + + + + <li><a href="/docs/en/cowboy/2.5/manual">2.5</a></li> + + <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> + <div class="span6 credits"> + <p><img src="/img/footer_logo.png"></p> + <p>Copyright © Loïc Hoguin 2012-2018</p> + </div> + </div> + </div> + </footer> + + + <script src="/js/custom.js"></script> + </body> +</html> + + |