// getHost tries its best to return the request host.
// According to section 14.23 of RFC 2616 the Host header
// can include the port number if the default value of 80 is not used.
func getHost(r *http.Request) string {
	if r.URL.IsAbs() {
		return r.URL.Host
	}
	return r.Host
}

func notImplementedHandler(w http.ResponseWriter, r *http.Request) {
	writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL)
}

pkg net/url, func QueryUnescape(string) (string, error)
pkg net/url, func User(string) *Userinfo
pkg net/url, func UserPassword(string, string) *Userinfo
pkg net/url, method (*Error) Error() string
pkg net/url, method (*URL) IsAbs() bool
pkg net/url, method (*URL) Parse(string) (*URL, error)
pkg net/url, method (*URL) Query() Values
pkg net/url, method (*URL) RequestURI() string
pkg net/url, method (*URL) ResolveReference(*URL) *URL