How use async service into angular httpClient interceptor

Question

Using Angular 4.3.1 and HttpClient, I need to modify the request and response by async service into the HttpInterceptor of httpClient,

Example for modifying the requ

Answer 1

The answers above seem to be fine. I had same requirements but faced issues due to update in different dependencies and operators. Took me some time but I found one working solution to this specific issue.

If you are using Angular 7 and RxJs version 6+ with requirements for Async Interceptor request then you can use this code which works with latest version of NgRx store and related dependencies:

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

    let combRef = combineLatest(this.store.select(App.getAppName));

    return combRef.pipe( take(1), switchMap((result) => {

        // Perform any updates in the request here
        return next.handle(request).pipe(
            map((event: HttpEvent) => {
                if (event instanceof HttpResponse) {
                    console.log('event--->>>', event);
                }
                return event;
            }),
            catchError((error: HttpErrorResponse) => {
                let data = {};
                data = {
                    reason: error && error.error.reason ? error.error.reason : '',
                    status: error.status
                };
                return throwError(error);
            }));
    }));