void body_limit( std::uint64_t v);
This function sets the maximum allowed size of the payload body, before any encodings except chunked have been removed. Depending on the message semantics, one of these cases will apply:
http::body_limitis returned immediately after the header is parsed.
Setting the limit after any body octets have been parsed results in undefined behavior. The default limit is 1MB for requests and 8MB for responses.
The payload body limit to set