(httpProtocol: StringAdd).self
(httpProtocol: StringFormat).self
(httpProtocol: ArrowAssoc[HttpProtocol]).x
(Since version 2.10.0) Use leftOfArrow
instead
(httpProtocol: Ensuring[HttpProtocol]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
The protocol of an HTTP message