How to add CORS request in header in Angular 5

Aman Kumar picture Aman Kumar · Nov 17, 2017 · Viewed 337.6k times · Source

I have added the CORS in header but I am still getting the CORS issue in my request. What is the correct way to add and handle CORS and other requests in the headers?

Here is service file code:

import { HttpClient, HttpHeaders, HttpClientModule } from '@angular/common/http';
const httpOptions = {
  headers: new HttpHeaders({ 
    'Access-Control-Allow-Origin':'*',
    'Authorization':'authkey',
    'userid':'1'
  })
};

public baseurl = 'http://localhost/XXXXXX';

userAPI(data): Observable<any> {
  return this.http.post(this.baseurl, data, httpOptions)
    .pipe(
      tap((result) => console.log('result-->',result)),
      catchError(this.handleError('error', []))
    );
}

Error:

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:4200' is therefore not allowed access

failed: Http failure response for (unknown url): 0 Unknown Error

In my server-side code, I've added CORS in the index file.

header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, PATCH, PUT, DELETE, OPTIONS');
header('Access-Control-Allow-Headers: Origin, Content-Type, X-Auth-Token');

Answer

rgantla picture rgantla · Dec 21, 2017

In my experience the plugins worked with HTTP but not with the latest httpClient. Also, configuring the CORS response headers on the server wasn't really an option. So, I created a proxy.conf.json file to act as a proxy server.

Read more about this here.

proxy.conf.json file:

{
  "/posts": {
    "target": "https://example.com",
    "secure": true,
    "pathRewrite": {
    "^/posts": ""
  },
    "changeOrigin": true
  }
}

I placed the proxy.conf.json file right next the the package.json file in the same directory.

Then I modified the start command in the package.json file:

"start": "ng serve --proxy-config proxy.conf.json"

The HTTP call from my app component:

return this._http.get('/posts/pictures?method=GetPictures')
.subscribe((returnedStuff) => {
  console.log(returnedStuff);
});

Lastly to run my app, I'd have to use npm start or ng serve --proxy-config proxy.conf.json