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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.