_parser.upgrade.description">Description</a>
        </h6>
<h6>
<a name="beast.ref.boost__beast__http__basic_parser.upgrade.h2"></a>
          <span class="phrase"><a name="beast.ref.boost__beast__http__basic_parser.upgrade.remarks"></a></span><a class="link" href="upgrade.html#beast.ref.boost__beast__http__basic_parser.upgrade.remarks">Remarks</a>
        </h6>
<p>
          The return value is undefined unless <a class="link" href="is_header_done.html" title="http::basic_parser::is_header_done"><code clas