Making golang Gorilla CORS handler work : <p>I have fairly simple setup here as described in the code below. But I am not able to get the <code>CORS</code> to work. I keep getting this error:</p>

<blockquote>
  <p>XMLHttpRequest cannot load <a href="http://localhost:3000/signup" rel="noreferrer">http://localhost:3000/signup</a>. Response to 
      preflight request doesn't pass access control check: No 'Access-
      Control-Allow-Origin' header is present on the requested resource. 
      Origin '<a href="http://localhost:8000" rel="noreferrer">http://localhost:8000</a>' is therefore not allowed access. The 
      response had HTTP status code 403.</p>
</blockquote>

<p>I am sure I am missing something simple here.</p>

<p>Here is the code I have:</p>

<pre><code>package main

import (
    "log"
    "net/http"

    "github.com/gorilla/handlers"
    "github.com/gorilla/mux"
    "myApp/src/controllers"
)

func main() {
    ac := new(controllers.AccountController)

    router := mux.NewRouter()
    router.HandleFunc("/signup", ac.SignUp).Methods("POST")
    router.HandleFunc("/signin", ac.SignIn).Methods("POST")

    log.Fatal(http.ListenAndServe(":3000", handlers.CORS()(router)))
}
</code></pre>
