(Inherited from <code class="computeroutput"><span class="identifier">http</span><span class="special">::</span><span class="identifier">basic_parser</span></code>)
</p>
<p>
- <a class="indexterm" name="idm45886643843696"></a>
+ <a class="indexterm" name="idm45873493014880"></a>
Returns <code class="computeroutput"><span class="keyword">true</span></code>
if the message is an upgrade message.
</p>