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The number of octets in the buffer pointed
          to by http::buffer_body::value_type::data.
        
std::size_t size = 0;
          If data is nullptr during serialization, this value
          is ignored. Otherwise, it represents the number of valid body octets pointed
          to by data.
        
          The value of this field will be decremented during parsing to indicate
          the number of remaining free octets in the buffer pointed to by data. When it reaches zero, the parser
          will return http::need_buffer, indicating to the
          caller that the values of data
          and size should be updated
          to point to a new memory buffer.