opend cors headers

Dockerfile

@@ -1,6 +1,9 @@
-FROM golang:1.12
-WORKDIR /opt/dal
+FROM golang:1.12 as build
+WORKDIR /opt/vdc
 COPY . .
 RUN CGO_ENABLED=0 go build -a --installsuffix cgo --ldflags="-w -s -X main.Build=$(git rev-parse --short HEAD)" -o mock-vdc
+
+FROM alpine
+COPY --from=build /opt/vdc/mock-vdc /opt/vdc/mock-vdc
 EXPOSE 8080
-ENTRYPOINT [ "/opt/dal/mock-vdc" ,"--port","8080"]
+ENTRYPOINT [ "/opt/vdc/mock-vdc" ,"--port","8080"]

main.go

@@ -110,6 +110,7 @@ func (v *VDCServer) Router() *mux.Router {
 	r := mux.NewRouter()
 
 	r.Methods("GET").Path("/ask").Handler(http.HandlerFunc(v.ask))
+	r.Methods("OPTIONS").Path("/ask").Handler(http.HandlerFunc(v.ask))
 	r.NotFoundHandler = http.HandlerFunc(v.notFound)
 	return r
 }
@@ -214,7 +215,7 @@ func (v *VDCServer) notFound(w http.ResponseWriter, r *http.Request) {
 func (v *VDCServer) ask(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Access-Control-Allow-Origin", "*")
 	w.Header().Set("Access-Control-Allow-Methods", "GET, OPTIONS, HEAD")
-	w.Header().Set("Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, Authorization, X-DITAS-CALLBACK")
+	w.Header().Set("Access-Control-Allow-Headers", "*")
 
 	v.Log(fmt.Sprintf("[%s] %s", r.Method, r.RequestURI))
 	v.Trace(r, "vdc-request")