Read response headers from API response - Angular 5 + TypeScript

Have you exposed the X-Token from server side using access-control-expose-headers? because not all headers are allowed to be accessed from the client side, you need to expose them from the server side

Also in your frontend, you can use new HTTP module to get a full response using {observe: 'response'} like

http  .get<any>('url', {observe: 'response'})  .subscribe(resp => {    console.log(resp.headers.get('X-Token'));  });

In my case in the POST response I want to have the authorization header because I was having the JWT Token in it.So what I read from this post is the header I we want should be added as an Expose Header from the back-end.So what I did was added the Authorization header to my Exposed Header like this in my filter class.

response.addHeader("Access-Control-Expose-Headers", "Authorization");response.addHeader("Access-Control-Allow-Headers", "Authorization, X-PINGOTHER, Origin, X-Requested-With, Content-Type, Accept, X-Custom-header");response.addHeader(HEADER_STRING, TOKEN_PREFIX + token); // HEADER_STRING == Authorization

And at my Angular Side

In the Component.

this.authenticationService.login(this.f.email.value, this.f.password.value)  .pipe(first())  .subscribe(    (data: HttpResponse<any>) => {      console.log(data.headers.get('authorization'));    },    error => {      this.loading = false;    });

At my Service Side.

return this.http.post<any>(Constants.BASE_URL + 'login', {username: username, password: password},  {observe: 'response' as 'body'})  .pipe(map(user => {       return user;  }));

You should use the new HttpClient. You can find more information here.

http  .get<any>('url', {observe: 'response'})  .subscribe(resp => {    console.log(resp.headers.get('X-Token'));  });