如何在 angular 中使用代理解决 CORS 问题 [英] How to resolve the CORS issue using proxy in angular

问题描述

我正在使用 express Node 后端和前端来处理 angular.问题是当我将 API 集成到 angular 时，我遇到了 CORS 问题.在开发人员控制台中，我收到了这样的错误XmlHttpRequet 无法加载 http://localhost:3000/student无访问控制允许来源"

I am using express Node backend and frontend for angular. the thing is when i was integrate my API to angular i had CORS problem. inside the developer console i have got a error like this "XmlHttpRequet cannot load http://localhost:3000/student No Access-Control-Allow-Origin"

我尝试代理后端，在 angular 项目中添加了一个 proxy-confg.json.但结果也一样.仍然存在 CORS 问题.

I have tried to proxy the backend adding a proxy-confg.json inside the angular project. but the result also same. still have CORS problem.

// node js endpoint
ApienpointUrl = 'http://localhost:4200/stdApi/student';

// getting data from endpoint
getStudentfromMock() {
return this.http.get(this.ApienpointUrl).pipe(
  map((res: any) => res),
  catchError(this.handleError)
);
}

这里是angular项目proxy.conf.json里面的Proxy配置

Here the Proxy configuration inside angular project proxy.conf.json

{
  "/stdApi/*": {
    "target": "http://localhost:3000",
    "secure": false,
    "logLevel": "debug",
    "changeOrigin": true
  }
}

我收到这样的错误:-

"XmlHttpRequet cannot load http://localhost:4200/stdApi/student No Access-Control-Allow-Origin. header is present on the request resources origin 'http://localhost:3000' therefor not allowed access".

推荐答案

将此代码添加到 app.js 文件中.

Add this code in app.js file.

app.use((req, res, next) => {
   // Website you wish to allow to connect
   res.setHeader('Access-Control-Allow-Origin', '*');

   // Request methods you wish to allow
   res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');

  // Request headers you wish to allow
  res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With, content-type, token, language');

   // Set to true if you need the website to include cookies in the requests sent
   // to the API (e.g. in case you use sessions)
   res.setHeader('Access-Control-Allow-Credentials', true);

   // Pass to next layer of middleware
   next(); 
});

然后重启服务器.

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