for requests and responses.
      </p>
<p>
        Every message contains a set of zero or more field name/value pairs, collectively
        called "fields". The names and values are represented using text
        strings with various requirements. A serialized field contains the field
        name, then a colon followed by a space (<code class="computeroutput"><span class="string">":
        "</span></code>), and finally the field value with a trailing CRLF.
      </p>
<h5>
<a name="beast.using_http.protoc