server_helper/util/cors.go

package util

import (
	"net/http"
)

// Cors writes cors headers
func Cors(h http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Credentials", "true")
		w.Header().Set("Access-Control-Allow-Methods", "GET,POST,PATCH,PUT,DELETE,OPTIONS")
		w.Header().Set("Access-Control-Expose-Headers", "*")
		w.Header().Set("Access-Control-Allow-Headers", "*")
		if r.Method == "OPTIONS" {
			WriteResponse(w, http.StatusOK, "Ok", "Ok")
			return
		} else {
			h.ServeHTTP(w, r)
		}
	})
}