让golang Gorilla CORS处理程序工作 [英] Making golang Gorilla CORS handler work

问题描述

我在这里有相当简单的设置，如下面的代码所述。但是我无法使 CORS 工作。我一直得到这个错误：

XMLHttpRequest无法加载 HTTP：//本地主机：3000 /注册。对
预检请求的响应未通过访问控制检查：否请求的资源上存在'Access-
Control-Allow-Origin'标头。因此不允许访问源
源' http：// localhost：8000 '。
响应的HTTP状态码为403.

我相信我在这里错过了一些简单的东西。

以下是我的代码：

 包主
 
进口（
记录
净/ 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）。方法（POST）
 
 log.Fatal（http.ListenAndServe（：3000，handlers.CORS（）（router）））
} 
  
 
 
 提前请求：您可能拥有JSON之类的内容类型，您的服务器可能无法处理。如果您在前端使用了常见的AJAX，请尝试添加此AJAX： https://en.wikipedia.org/wiki/List_of_HTTP_header_fields#Requested-With  
 
 
 
 Gorilla的 handlers.CORS（） code>将设置理智的默认值以获得CORS的基础知识为您工作;然而，你可以（也许应该）以更实用的方式进行控制。 
 
 
以下是一些入门代码：
 
 
 
  headersOk：= handlers.AllowedHeaders（[] string {X-Requested-With}）
 originsOk：= handlers.AllowedOrigins（[] string {os.Getenv（ ORIGIN_ALLOWED）}）
 methodsOk：= handlers.AllowedMethods（[] string {GET，HEAD，POST，PUT，OPTIONS}）
 
 // start server listen 
 //带有错误处理
 log.Fatal（http.ListenAndServe（：+ os.Getenv（PORT），handlers.CORS（originsOk，headersOk，methodsOk）（路由器）））
  
 
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)))
}

解决方案
Please read the link Markus suggested, and also about what triggers CORS pre-flight requests. 

Pre-flight requests: You may have a content type like JSON, or some other custom header that's triggering a pre-flight request, which your server may not be handling. Try adding this one, if you're using the ever-common AJAX in your front-end: https://en.wikipedia.org/wiki/List_of_HTTP_header_fields#Requested-With

Gorilla's handlers.CORS() will set sane defaults to get the basics of CORS working for you; however, you can (and maybe should) take control in a more functional manner.

Here's some starter code:

headersOk := handlers.AllowedHeaders([]string{"X-Requested-With"})
originsOk := handlers.AllowedOrigins([]string{os.Getenv("ORIGIN_ALLOWED")})
methodsOk := handlers.AllowedMethods([]string{"GET", "HEAD", "POST", "PUT", "OPTIONS"})

// start server listen
// with error handling
log.Fatal(http.ListenAndServe(":" + os.Getenv("PORT"), handlers.CORS(originsOk, headersOk, methodsOk)(router)))


                        
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