diff --git a/server.go b/server.go
index 08e8ec4..959ce7b 100644
--- a/server.go
+++ b/server.go
@@ -772,7 +772,18 @@ func (hc *HttpApiBroker) AddHandler(receiver HttpApiHandler) {
 	}
 }
 
-func (hc *HttpApiBroker) Call(funcname string, w http.ResponseWriter, r *http.Request) {
+func (hc *HttpApiBroker) Call(w http.ResponseWriter, r *http.Request) {
+	funcname := r.URL.Query().Get("call")
+	if len(funcname) == 0 {
+		logger.Println("query param 'call' is missing")
+		w.WriteHeader(http.StatusBadRequest)
+		return
+
+	}
+	hc.call(funcname, w, r)
+}
+
+func (hc *HttpApiBroker) call(funcname string, w http.ResponseWriter, r *http.Request) {
 	if found := hc.methods[funcname]; found != nil {
 		found(w, r)
 	} else {