onses do not carry a body. For example,
                  a 200 response to a <a href="https://tools.ietf.org/html/rfc7231#section-4.3.6" target="_top">CONNECT</a>
                  request from a tunneling proxy, or a response to a <a href="https://tools.ietf.org/html/rfc7231#section-4.3.2" target="_top">HEAD</a>
                  request. In these cases, callers may use this function inform the
                  parser that no body is expected. The parser will consider the message
                  comple