Update async for CallbackUrl

Signed-off-by: Alex <alexellis2@gmail.com>

gateway/handlers/queueproxy.go

@@ -28,7 +28,7 @@ func MakeQueuedProxy(metrics metrics.MetricOptions, wildcard bool, logger *logru
 		vars := mux.Vars(r)
 		name := vars["name"]
 
-		callbackURLHeader := r.Header.Get("X-Callback-URL")
+		callbackURLHeader := r.Header.Get("X-Callback-Url")
 		var callbackURL *url.URL
 
 		if len(callbackURLHeader) > 0 {

gateway/queue/types.go

@@ -8,9 +8,9 @@ type Request struct {
 	Header      http.Header
 	Body        []byte
 	Method      string
-	CallbackURL *url.URL
 	QueryString string
 	Function    string
+	CallbackURL *url.URL `json:"CallbackUrl"`
 }
 
 // CanQueueRequests can take on asynchronous requests