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<h1 class="lined-header"><span>cowboy_req:stream_reply(3)</span></h1>
<div class="sect1">
<h2 id="_name">Name</h2>
<div class="sectionbody">
<div class="paragraph"><p>cowboy_req:stream_reply - Send the response headers</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">Description</h2>
<div class="sectionbody">
<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">stream_reply</span></span>(<span style="color: #009900">Status</span>, <span style="color: #009900">Req</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:req</span></span>())
<span style="color: #990000">-></span> <span style="font-weight: bold"><span style="color: #000000">stream_reply</span></span>(<span style="color: #009900">StatusCode</span>, #{}, <span style="color: #009900">Req</span>)
<span style="font-weight: bold"><span style="color: #000000">stream_reply</span></span>(<span style="color: #009900">Status</span>, <span style="color: #009900">Headers</span>, <span style="color: #009900">Req</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:req</span></span>())
<span style="color: #990000">-></span> <span style="color: #009900">Req</span>
<span style="color: #009900">Status</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy:http_status</span></span>()
<span style="color: #009900">Headers</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy:http_headers</span></span>()</tt></pre></div></div>
<div class="paragraph"><p>Send the response headers.</p></div>
<div class="paragraph"><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></div>
<div class="paragraph"><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></div>
<div class="paragraph"><p>Use <a href="../cowboy_req.set_resp_cookie">cowboy_req:set_resp_cookie(3)</a>
instead of this function to set cookies.</p></div>
<div class="paragraph"><p>If a response body was set before calling this function,
it will not be sent.</p></div>
<div class="paragraph"><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></div>
<div class="paragraph"><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></div>
<div class="paragraph"><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. HTTP/1.0 will send the body
unmodified and close the connection at the end if no
content-length was set.</p></div>
<div class="paragraph"><p>It is not possible to push resources after this function
returns. Any attempt will result in an error.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_arguments">Arguments</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
Status
</dt>
<dd>
<p>
The status code for the response.
</p>
</dd>
<dt class="hdlist1">
Headers
</dt>
<dd>
<p>
The response headers.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>Header names must be given as lowercase binary strings.</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
Req
</dt>
<dd>
<p>
The Req object.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_return_value">Return value</h2>
<div class="sectionbody">
<div class="paragraph"><p>A new Req object is returned.</p></div>
<div class="paragraph"><p>The returned Req object must be used from that point onward
in order to be able to stream the response body.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_changelog">Changelog</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
<strong>2.0</strong>: Only the Req is returned, it is no longer wrapped in a tuple.
</p>
</li>
<li>
<p>
<strong>2.0</strong>: Function introduced. Replaces <code>chunked_reply/1,2</code>.
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">Examples</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="title">Initiate the response</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: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:stream_reply</span></span>(<span style="color: #993399">200</span>, <span style="color: #009900">Req0</span>)<span style="color: #990000">.</span></tt></pre></div></div>
<div class="listingblock">
<div class="title">Stream the response with custom headers</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: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:stream_reply</span></span>(<span style="color: #993399">200</span>, #{
<span style="color: #990000"><<</span><span style="color: #FF0000">"content-type"</span><span style="color: #990000">>></span> <span style="color: #990000">=></span> <span style="color: #990000"><<</span><span style="color: #FF0000">"text/plain"</span><span style="color: #990000">>></span>
}, <span style="color: #009900">Req0</span>),
<span style="font-weight: bold"><span style="color: #000000">cowboy_req:stream_body</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"Hello\n"</span><span style="color: #990000">>></span>, <span style="color: #FF6600">nofin</span>, <span style="color: #009900">Req</span>),
<span style="font-weight: bold"><span style="color: #000000">timer:sleep</span></span>(<span style="color: #993399">1000</span>),
<span style="font-weight: bold"><span style="color: #000000">cowboy_req:stream_body</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"World!\n"</span><span style="color: #990000">>></span>, <span style="color: #FF6600">fin</span>, <span style="color: #009900">Req</span>)<span style="color: #990000">.</span></tt></pre></div></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">See also</h2>
<div class="sectionbody">
<div class="paragraph"><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_trailers">cowboy_req:stream_trailers(3)</a>,
<a href="../cowboy_req.push">cowboy_req:push(3)</a></p></div>
</div>
</div>
</div>
<div class="span3 sidecol">
<h3>
Cowboy
2.3
Function Reference
</h3>
<ul>
<li><a href="/docs/en/cowboy/2.3/guide">User Guide</a></li>
<li><a href="/docs/en/cowboy/2.3/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>
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