the request message body length in bytes (0 indicates that no request message body is expected)
HttpException (use the http_exception member) with status set to - status.RequestEntityTooLarge to reject a request whose message body is too long or - an appropriate status to abort request processing and immediately send the response if the message body length cannot be determined, e.g. because required request header parameters are missing.
Tells the request message body length. This method should be overridden when a request message body is expected. It is invoked when the message header is completely parsed. The default behaviour is expecting no request message body.