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go - Making golang Gorilla CORS handler work

I have fairly simple setup here as described in the code below. But I am not able to get the CORS to work. I keep getting this error:

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

I am sure I am missing something simple here.

Here is the code I have:

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)))
}
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