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<body class="manpage">
<div id="header">
<h1>nn_ws(7) Manual Page</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>nn_ws - WebSocket transport mechanism</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph">
<p><strong>#include &lt;nanomsg/nn.h&gt;</strong></p>
</div>
<div class="paragraph">
<p><strong>#include &lt;nanomsg/ws.h&gt;</strong></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The WebSocket transport uses the framing protocol specified in RFC 6455 to
transport messages. The initial handshake is done using HTTP headers, with the
<code>Sec-Websocket-Protocol</code> header set to the SP protocol used by the server.
For example, a REQ client will send <code>rep.sp.nanomsg.org</code>.</p>
</div>
<div class="paragraph">
<p>Each SP message is transported in a single WebSocket frame, with no additional
data or headers applied. By default this library sends and expects to receive
binary frames.</p>
</div>
<div class="paragraph">
<p>When calling either <code>nn_bind()</code> or <code>nn_connect()</code>, omitting the port defaults
to the RFC 6455 default port 80 for HTTP. For example, <code>ws://127.0.0.1</code> is
equivalent to <code>ws://127.0.0.1:80</code></p>
</div>
<div class="paragraph">
<p>WebSocket over TLS is not supported by this library, at this time.</p>
</div>
<div class="sect2">
<h3 id="_uri_limitations">URI limitations</h3>
<div class="paragraph">
<p>When calling <code>nn_connect()</code>, the URI may also optionally include the path to a
resource and/or query parameters.</p>
</div>
<div class="exampleblock">
<div class="title">Example 1. Path and query parameters</div>
<div class="content">
<div class="literalblock">
<div class="content">
<pre>s1 = nn_socket (AF_SP, NN_PAIR);
nn_connect (s1, "ws://example.com/path?query=value");</pre>
</div>
</div>
</div>
</div>
<div class="paragraph">
<p>This implementation includes the full path and any query parameters in the
HTTP handshake when establishing connections with <code>nn_connect()</code>. This
information is not available via the nanomsg API afterwards, however.</p>
</div>
<div class="paragraph">
<p>Likewise, this implementation does not examine or use either any path or
query parameters that may be supplied to <code>nn_bind()</code>, as it only binds to
the TCP port. This implementation acts as a limited HTTP server that offers
SP over WebSocket at all URIs for the given TCP address.</p>
</div>
<div class="paragraph">
<p>Applications, however, should not depend on this behavior; intervening
infrastructure may proxy, filter or route based on URI, and other
implementations of the SP over WebSocket protocol may offer other
HTTP services at the same TCP port, utilizing the path, query parameters,
or both to determine the service to be used.</p>
</div>
</div>
<div class="sect2">
<h3 id="_socket_options">Socket Options</h3>
<div class="dlist">
<dl>
<dt class="hdlist1">NN_WS_MSG_TYPE</dt>
<dd>
<p>This option may be set to NN_WS_MSG_TYPE_TEXT or NN_WS_MSG_TYPE_BINARY.
The value of this determines whether data messages are sent as WebSocket
text frames, or binary frames, per RFC 6455. Text frames should contain
only valid UTF-8 text in their payload, or they will be rejected. Binary
frames may contain any data. Not all WebSocket implementations support
binary frames. The default is to send binary frames.</p>
<div class="paragraph">
<p>This option may also be specified as control data when when sending
a message with <code>nn_sendmsg()</code>.</p>
</div>
</dd>
<dt class="hdlist1">TODO: NN_TCP_NODELAY</dt>
<dd>
<p>This option, when set to 1, disables Nagle&#8217;s algorithm. It also disables
delaying of TCP acknowledgments. Using this option improves latency at
the expense of throughput. Type of this option is int. Default value is 0.</p>
</dd>
</dl>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_example">EXAMPLE</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre>nn_bind (s1, "ws://*:5555");
nn_connect (s2, "ws://myserver:5555");</pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="nn_tcp.7.html">nn_tcp(7)</a>
<a href="nn_inproc.7.html">nn_inproc(7)</a>
<a href="nn_ipc.7.html">nn_ipc(7)</a>
<a href="nn_bind.3.html">nn_bind(3)</a>
<a href="nn_connect.3.html">nn_connect(3)</a>
<a href="nanomsg.7.html">nanomsg(7)</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_authors">AUTHORS</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="mailto:sustrik@250bpm.com">Martin Sustrik</a>
<a href="mailto:jack@wirebirdlabs.com">Jack R. Dunaway</a>
<a href="mailto:garrett@damore.org">Garrett D&#8217;Amore</a></p>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
nanomsg 1.0.0-rc1<br>
Last updated 2016-06-03 09:45:52 PDT
</div>
</div>
</body>