连接到Go轧棉机时，角度为8 CORS

我用Golang's和。这是我使用的：

梅因，加油

在控制台中，Gin返回状态代码204

我认为这是CORS的问题，所以我实施了金酒：

不幸的是，它仍然不起作用。如果我将POST方法添加到允许的方法中，也不会：

AllowMethods:     []string{"PUT", "PATCH", "POST"}

我最后一次尝试是使用代理，如中所述：

proxy.conf.json

angular.json

我重新启动了ng serve，但仍然出现错误。我根据代理文件中的配置将auth.service和main.go中的URL更改为/api/login

我在这里做错了什么？

将alloweaders:[]字符串{Origin}更改为alloweaders:[]字符串{content type}

headers = new HttpHeaders({ "Content-Type": "application/json" });

login(username: string, password: string): Promise<any> {
    const url: string = `${this.BASE_URL}` + "/login";
    const request = this.http
        .post(
            url,
            JSON.stringify({ username: username, password: password }),
            { headers: this.headers }
        )

        .toPromise();

    return request;
}

Access to XMLHttpRequest at 'http://127.0.0.1:8000/api/login' from origin 'http://localhost:4200' has been blocked by CORS policy: Request header field content-type is not allowed by Access-Control-Allow-Headers in preflight response.

r.Use(cors.New(cors.Config{
    AllowOrigins:     []string{"http://localhost:8000"},
    AllowMethods:     []string{"PUT", "PATCH"},
    AllowHeaders:     []string{"Origin"},
    ExposeHeaders:    []string{"Content-Length"},
    AllowCredentials: true,
    AllowOriginFunc: func(origin string) bool {
        return origin == "https://github.com"
    },
    MaxAge: 12 * time.Hour,
}))

AllowMethods:     []string{"PUT", "PATCH", "POST"}

{
  "/api": {
    "target": "http://localhost:8000",
    "secure": false
  }
}

"options": {
      "browserTarget": "your-application-name:build",
      "proxyConfig": "src/proxy.conf.json"
 }