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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>http_accept</title><link rel="stylesheet" type="text/css" href="rivet.css"><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="index.html" title="Apache Rivet 3.2"><link rel="up" href="commands.html" title="Rivet Tcl Commands and Variables"><link rel="prev" href="html.html" title="html"><link rel="next" href="import_keyvalue_pairs.html" title="import_keyvalue_pairs"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">http_accept</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="html.html"><img src="images/prev.png" alt="Prev"></a> </td><th width="60%" align="center">Rivet Tcl Commands and Variables</th><td width="20%" align="right"> <a accesskey="n" href="import_keyvalue_pairs.html"><img src="images/next.png" alt="Next"></a></td></tr></table></div><div class="refentry"><div class="refentry.separator"><hr></div><a name="http_accept"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>http_accept — Parse HTTP Accept header lines</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis" style="width:80%"><div style="border: 1px solid #282; margin:1ex ; padding:.4ex; padding-left: 0.8ex; word-spacing:1ex "><span style="font-weight:bold ; font-family:monospace">::rivet::http_accept
?<span style="font-family:monospace; font-weight: bold;"><em class="replaceable"><code>-zeroweight</code></em></span>?
?<span style="font-family:monospace; font-weight: bold;"><em class="replaceable"><code>-default</code></em></span>?
?<span style="font-family:monospace; font-weight: bold;"><em class="replaceable"><code>-list</code></em></span>?
http_accept_line</span> </div></div></div><div class="refsect1"><a name="idm1289"></a><h2>Description</h2><p style="width:90%">
Command for parsing HTTP Accept header lines that tell the
server about preferences and/or capabilities of the browser
(e.g. content language,media type, etc.). The following
script
</p><p style="width:90%">
<span style="font-family:monospace"><span class="command"><strong>::rivet::http_accept</strong></span></span> returns a dictionary
value in which every content preference is matched to its
precedence value
</p><pre class="programlisting">load_headers
set language_precedence [::rivet::http_accept $headers(Accept-Language)]
foreach lan [dict keys $language_precedence] {
puts "$lan -> [dict get $language_precedence $lan]"
}</pre><p style="width:90%">
when run from a browser where 5 languages were chosen
would output
</p><pre class="programlisting">en-us -> 1
en -> 0.8
it -> 0.6
de-de -> 0.4
fr-fr -> 0.2</pre><p style="width:90%">
The <em class="replaceable"><code>-list</code></em> switch would suppress
the precedence values and the accepted fields
are returned listed with decreasing precedence order.
</p><pre class="programlisting"> puts [::rivet::http_accept -list $headers(Accept)]
text/html application/xhtml+xml application/xml */*
</pre><p style="width:90%">
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