Implementing conditional logic to determine if headers should be added to the req.clone method within an Angular HttpInterceptor

I need to implement an if statement in the following logic within my HttpInterceptor:

const authToken = this.auth.getAuthorizationToken();

const authReq = req.clone({
     headers: req.headers.set('Authorization', `Bearer ${authToken}`)
});

Prior to updating the headers with the authToken, I want to make sure that it actually exists. I believe this may be related to syntax or a different approach to setting the headers property of req.clone().

My attempt is as follows, but I think there might be a more efficient way to achieve this:

let authReq: HttpRequest<any> = req;

if (authToken) {
  authReq = req.clone({
    headers: req.headers.set('Authorization', `Bearer ${authToken}`)
  });
}

Answer №1

You're making progress in the right direction. To achieve your goal, you should update the request if a token is present or keep it as is if there's no token available. Here's an example to guide you:

intercept(
  req: HttpRequest<any>,
  next: HttpHandler,
): Observable<HttpEvent<any>> {
  const authToken = this.auth.getAuthorizationToken();

  if (authToken) {
    req = req.clone({
      headers: req.headers.set('Authorization', `Bearer ${authToken}`)
    });
  }

  return next.handle(req);
}

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