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http::message::payload_size

Returns the payload size of the body in octets if possible.

Synopsis
boost::optional< std::uint64_t >
payload_size() const;
Description

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).

Remarks

The value of the Content-Length field in the message is not inspected.


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