Add specific headers for each request in Angular

Question

If I have an interceptor that adds headers for each request, but in each request I must add additional headers specific to each request, how can I add those headers?

(I omit imports of httpClient and others)

// any.interceptor.service.ts

intercept(req: HttpRequest<any>, next: HttpHandler) {
  const authToken = this.auth.getAuthorizationToken();
  const authReq = req.clone({
    headers: req.headers.set('Authorization', authToken)
  });
  return next.handle(authReq);
}

// my.service.ts

@Injectable({
provideIn: 'root'
})
export class MyService {
  send(data: AnyInterface) {
    // *******************
    // adding HERE additional specific headers
    // *******************
    this.http.post(URL, data);
  }
}

Answer 1

I was finally able to resolve the issue. Reading this article I was able to understand that HttpHeaders are immutable, so the solution to @Emilien would only have to modify the following:

send(data: AnyInterface) {
  const headers = new HttpHeaders().set('YOUR_HEADER_KEY', 'YOUR_HEADER_VALUE');
  this.http.post(URL, data, { headers });
}

Thanks!