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<h1 class="lined-header"><span>cowboy_req:stream_reply(3)</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy_req:stream_reply - Send the response headers</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">stream_reply</font></b>(<font color="#009900">Status</font>, <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">stream_reply</font></b>(<font color="#009900">StatusCode</font>, #{}, <font color="#009900">Req</font>)
<b><font color="#000000">stream_reply</font></b>(<font color="#009900">Status</font>, <font color="#009900">Headers</font>, <font color="#009900">Req</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:req</font></b>())
<font color="#990000">-></font> <font color="#009900">Req</font>
<font color="#009900">Status</font> <font color="#990000">::</font> <b><font color="#000000">cowboy:http_status</font></b>()
<font color="#009900">Headers</font> <font color="#990000">::</font> <b><font color="#000000">cowboy:http_headers</font></b>()</tt></pre>
</div></div>
<p>Send the response headers.</p>
<p>The header names must be given as lowercase binary strings. While header names are case insensitive, Cowboy requires them to be given as lowercase to function properly.</p>
<p>Cowboy does not allow duplicate header names. Headers set by this function may overwrite those set by <code>set_resp_header/3</code>.</p>
<p>Use <a href="../cowboy_req.set_resp_cookie">cowboy_req:set_resp_cookie(3)</a> instead of this function to set cookies.</p>
<p>If a response body was set before calling this function, it will not be sent.</p>
<p>Use <a href="../cowboy_req.stream_body">cowboy_req:stream_body(3)</a> to stream the response body and optionally <a href="../cowboy_req.stream_trailers">cowboy_req:stream_trailers(3)</a> to send response trailer field values.</p>
<p>You may want to set the content-length header when using this function, if it is known in advance. This will allow clients using HTTP/2 and HTTP/1.0 to process the response more efficiently.</p>
<p>The streaming method varies depending on the protocol being used. HTTP/2 will use the usual DATA frames. HTTP/1.1 will use chunked transfer-encoding, if the content-length response header is set the body will be sent without chunked chunked transfer-encoding. HTTP/1.0 will send the body unmodified and close the connection at the end if no content-length was set.</p>
<p>It is not possible to push resources after this function returns. Any attempt will result in an error.</p>
<h2 id="_arguments">Arguments</h2>
<dl><dt>Status</dt>
<dd><p>The status code for the response.</p>
</dd>
<dt>Headers</dt>
<dd><p>The response headers.</p>
<p>Header names must be given as lowercase binary strings.</p>
</dd>
<dt>Req</dt>
<dd><p>The Req object.</p>
</dd>
</dl>
<h2 id="_return_value">Return value</h2>
<p>A new Req object is returned.</p>
<p>The returned Req object must be used from that point onward in order to be able to stream the response body.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>2.0</strong>: Only the Req is returned, it is no longer wrapped in a tuple.
</li>
<li><strong>2.0</strong>: Function introduced. Replaces <code>chunked_reply/1,2</code>.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Initiate the response</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">Req</font> <font color="#990000">=</font> <b><font color="#000000">cowboy_req:stream_reply</font></b>(<font color="#993399">200</font>, <font color="#009900">Req0</font>)<font color="#990000">.</font></tt></pre>
</div></div>
<div class="listingblock"><div class="title">Stream the response with custom headers</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">Req</font> <font color="#990000">=</font> <b><font color="#000000">cowboy_req:stream_reply</font></b>(<font color="#993399">200</font>, #{
<font color="#990000"><<</font><font color="#FF0000">"content-type"</font><font color="#990000">>></font> <font color="#990000">=></font> <font color="#990000"><<</font><font color="#FF0000">"text/plain"</font><font color="#990000">>></font>
}, <font color="#009900">Req0</font>),
<b><font color="#000000">cowboy_req:stream_body</font></b>(<font color="#990000"><<</font><font color="#FF0000">"Hello\n"</font><font color="#990000">>></font>, <font color="#FF6600">nofin</font>, <font color="#009900">Req</font>),
<b><font color="#000000">timer:sleep</font></b>(<font color="#993399">1000</font>),
<b><font color="#000000">cowboy_req:stream_body</font></b>(<font color="#990000"><<</font><font color="#FF0000">"World!\n"</font><font color="#990000">>></font>, <font color="#FF6600">fin</font>, <font color="#009900">Req</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.set_resp_cookie">cowboy_req:set_resp_cookie(3)</a>, <a href="../cowboy_req.set_resp_header">cowboy_req:set_resp_header(3)</a>, <a href="../cowboy_req.set_resp_headers">cowboy_req:set_resp_headers(3)</a>, <a href="../cowboy_req.inform">cowboy_req:inform(3)</a>, <a href="../cowboy_req.reply">cowboy_req:reply(3)</a>, <a href="../cowboy_req.stream_body">cowboy_req:stream_body(3)</a>, <a href="../cowboy_req.stream_events">cowboy_req:stream_events(3)</a>, <a href="../cowboy_req.stream_trailers">cowboy_req:stream_trailers(3)</a>, <a href="../cowboy_req.push">cowboy_req:push(3)</a></p>
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<h3>
Cowboy
2.10
Function Reference
</h3>
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<li><a href="/docs/en/cowboy/2.10/manual">Function Reference</a></li>
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<h4>Version select</h4>
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<li><a href="/docs/en/cowboy/2.12/manual">2.12</a></li>
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