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31 Returns <code class="computeroutput"><span class="keyword">true</span></code>
32 if the message is an upgrade message.
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38 <pre class="programlisting"><span class="keyword">bool</span>
39 <span class="identifier">upgrade</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
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50 The return value is undefined unless <a class="link" href="is_header_done.html" title="http::basic_parser::is_header_done"><code class="computeroutput"><span class="identifier">http</span><span class="special">::</span><span class="identifier">basic_parser</span><span class="special">::</span><span class="identifier">is_header_done</span></code></a> would return <code class="computeroutput"><span class="keyword">true</span></code>.
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