valid
          storage as the next buffer representing the body.
        </p>
<h6>
<a name="beast.ref.boost__beast__http__buffer_body__value_type.data.h3"></a>
          <span class="phrase"><a name="beast.ref.boost__beast__http__buffer_body__value_type.data.when_parsing"></a></span><a class="link" href="data.html#beast.ref.boost__beast__http__buffer_body__value_type.data.when_parsing">When
          Parsing</a>
        </h6>
<p>
          If this is <code class="computeroutput"><span class="keyword">nullp