GetOriginal goes through the chain of wrapped http.ResponseWriter objects and returns the original http.ResponseWriter object provided to the first request handler in the filter chain.

WrapForHTTP1Or2 accepts a user-provided decorator of an "inner" http.responseWriter object and potentially wraps the user-provided decorator with a new http.ResponseWriter object that implements http.CloseNotifier, http.Flusher, and/or http.Hijacker by delegating to the user-provided decorator (if it implements the relevant method) or the inner http.ResponseWriter (otherwise), so that the returned http.ResponseWriter object implements the same subset of those interfaces as the inner http.ResponseWriter.

FakeResponseWriter implements http.ResponseWriter, it is used for testing purpose only.

For HTTP2 an http.ResponseWriter object implements http.Flusher and http.CloseNotifier.

For HTTP/1.x an http.ResponseWriter object implements http.Flusher, http.CloseNotifier and http.Hijacker.

CloseNotifierFlusher is a combination of http.CloseNotifier and http.Flusher This applies to both http/1.x and http2 requests.

UserProvidedDecorator represensts a user (client that uses this package) provided decorator that wraps an inner http.ResponseWriter object.