er.special_fields"></a></span><a class="link" href="protocol_primer.html#beast.using_http.protocol_primer.special_fields">Special
        Fields</a>
      </h5>
<p>
        Certain fields appearing in messages are special. The library understands
        these fields when performing serialization and parsing, taking automatic
        action as needed when the fields are parsed in a message and also setting
        the fields if the caller requests it.
      </p>
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<a name="beast.using_http