func mostlyCopy(r *Response) *Response {
	c := *r
	c.Body = nil
	c.TransferEncoding = nil
	c.TLS = nil
	c.Request = nil
	return &c
}

type slurpResult struct {
	io.ReadCloser
	body []byte
	err  error
}

func (sr slurpResult) String() string { return fmt.Sprintf("body %q; err %v", sr.body, sr.err) }

func (tt h12Compare) normalizeRes(t *testing.T, res *Response, wantProto string) {