dongxie8856 2017-04-05 13:20
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I'm facing some issue with my implementation. I have a backend written in Golang and the UI (in Angular2) which are on the same server.

I've tried to set the CORS handling in my backend but it still doesn't work and I'm not getting why.

Here's my code:

package main

import (


var router *mux.Router

func main() {
    router = mux.NewRouter()

    HandleFuncEx("/authentication", handleAuthentication)
    HandleFuncEx("/callA", handleCallA)
    HandleFuncEx("/callB", handleCallB)
    HandleFuncEx("/callC", handleCallC)

    handler := cors.New(cors.Options{
        AllowedOrigins: []string{"*"},
        AllowedMethods: []string{"GET", "POST", "PATCH"},
        AllowedHeaders: []string{"a_custom_header", "content_type"},
    http.ListenAndServe(":8000", handler)


func HandleFuncEx(pattern string, handler func(http.ResponseWriter, *http.Request)) {
    log.Println("handled function", pattern)
    router.HandleFunc(pattern, handler)

The authentication pattern works correctly (is the first called by the UI) all the others calls fails the preflight request. Why is it happening?

Thanks everybody for the help!


This is an example of a non-working response Headers:

HTTP/1.1 200 OK
Vary: Origin
Vary: Access-Control-Request-Method
Vary: Access-Control-Request-Headers
Date: Fri, 07 Apr 2017 08:33:12 GMT
Content-Length: 0
Content-Type: text/plain; charset=utf-8

And these are request's headers:

OPTIONS /users HTTP/1.1
Host: /* Removed by my company policy */
Connection: keep-alive
Access-Control-Request-Method: GET
Origin: /* Removed by my company policy */
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_4) 
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36
Access-Control-Request-Headers: access_token
Accept: */*
Referer: /* Removed by my company policy */
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-GB,en;q=0.8,en-US;q=0.6,it;q=0.4,la;q=0.2
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