Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Prepare the message payload fields for the body.

void
prepare_payload();

This function will adjust the Content-Length and Transfer-Encoding field values based on the properties of the body.

request<string_body> req{verb::post, "/" };
req.set(field::user_agent, "Beast" );
req.body() = "Hello, world!" ;
req.prepare_payload();

This function is not necessary to call in the following situations: