CloneRequest returns a clone of the provided *http.Request.

NewHeaderRequestModifier returns a RequestModifier that merges the HTTP headers passed as an argument, with the HTTP headers of a request.

NewTransport returns an http.RoundTripper that modifies requests according to the RequestModifiers passed in the arguments, before sending the requests to the base http.RoundTripper (which, if nil, defaults to http.DefaultTransport).

OnEOFReader ensures a callback function is called on Close() and when the underlying Reader returns an io.EOF error.