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Returns the payload size of the body in octets if possible.
boost::optional< std::uint64_t > payload_size() const;
          This function invokes the Body algorithm
          to measure the number of octets in the serialized body container. If there
          is no body, this will return zero. Otherwise, if the body exists but is
          not known ahead of time, boost::none
          is returned (usually indicating that a chunked Transfer-Encoding will be
          used).
        
The value of the Content-Length field in the message is not inspected.