http - Angular 4 - setting withCredentials on every request - cors cookie

Question

My angular client is separated from the backend and I have enabled cors on the backend, everything works fine except the fact that my authentication fails because the cookie is not added to requests.

After searching online I found that I should set {withCredentials : true} on every http request. I managed to do it on a single request and it works, but not on all the requests.

I tried using BrowserXhr How to send "Cookie" in request header for all the requests in Angular2? but it doesn't work and it's also deprecated afaik.

I also tried RequestOptions but it didn't work.

What can I do to set {withCredentials: true} on every http request?

Later Edit:

@Injectable()
export class ConfigInterceptor implements HttpInterceptor {

  constructor(private csrfService: CSRFService) {

  }

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    let token = this.csrfService.getCSRF() as string;
    const credentialsReq = req.clone({withCredentials : true, setHeaders: { "X-XSRF-TOKEN": token } });
    return next.handle(credentialsReq);
  }
}

Answer 1

You can use an HttpInterceptor.

@Injectable()
export class CustomInterceptor implements HttpInterceptor {

    constructor() {
    }

    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {

        request = request.clone({
            withCredentials: true
        });

        return next.handle(request);
    }
}

Next you have to provide it:

@NgModule({
  bootstrap: [AppComponent],
  imports: [...],
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: CustomInterceptor ,
      multi: true
    }
  ]
})
export class AppModule {}

Source and full explanation