w.Header().Add("X-Multi-Value", "bar")
		http.SetCookie(w, &http.Cookie{Name: "flavor", Value: "chocolateChip"})
		w.WriteHeader(backendStatus)
		w.Write([]byte(backendResponse))
		w.Header().Set("X-Trailer", "trailer_value")
		w.Header().Set(http.TrailerPrefix+"X-Unannounced-Trailer", "unannounced_trailer_value")
	}))
	defer backend.Close()
	backendURL, err := url.Parse(backend.URL)
	if err != nil {
		t.Fatal(err)
	}

)

// Enum value maps for Tracer.
var (
	Tracer_name = map[int32]string{
		0: "zipkin",
		1: "lightstep",
		2: "datadog",
		3: "stackdriver",
		4: "openCensusAgent",
		5: "none",
	}
	Tracer_value = map[string]int32{
		"zipkin":          0,
		"lightstep":       1,
		"datadog":         2,
		"stackdriver":     3,
		"openCensusAgent": 4,
		"none":            5,
	}
)