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H2.RequestSourceRequest
A client-initiated HTTP message.
create ?headers ~scheme meth target creates an HTTP request with the given parameters. In HTTP/2, the :scheme pseudo-header field is required and includes the scheme portion of the target URI. The headers parameter is optional, however clients will want to include the :authority pseudo-header field in most cases. The :authority pseudo-header field includes the authority portion of the target URI, and should be used instead of the Host header field in HTTP/2.
See RFC7540§8.1.2.4 for more details.