Awaitable HttpResponseError

Question

Awaitable HttpResponseError

My challenge is that I'm attempting to handle a HttpError or HttpErrorResponse using an observable. However, the only option I have is to handle the HttpResponse, which is necessary but not sufficient. I also need to find a way to avoid this limitation.

https://i.stack.imgur.com/hEDEz.png

In addition, it's crucial for me to promptly alert the user whenever there is an issue with the response, allowing them to retry if needed...

this.addService.log()
          .subscribe(event => {
            if (event instanceof HttpResponse) {
              //do something
            } else if ( event instanceof HttpErrorResponse){ 
              console.log(`unable to handle HttpErrorResponse`)
            } else if (event instanceof ErrorEvent){ 
              console.log(`unable to handle ErrorEvent`)
            } 
    });
}

I attempted enclosing the entire operation within a try-catch block, yet no error was thrown as expected.

angular observable httprequest httpresponse http-error

Answer 1

Answer №1

If you are looking to implement error handling in your Angular application, you can consider using the HTTPInterceptor - Interceptor functionality.

To get started, you would need to create a new file, let's call it "ErrorInterceptorService". In this file, you would define a class called "ErrorInterceptorService" that implements the HttpInterceptor interface. The constructor of this class should accept any necessary dependencies such as ToastrService and Router.

@Injectable({
  providedIn: 'root'
})
export class ErrorInterceptorService implements HttpInterceptor {

  constructor(private toastr: ToastrService, private router: Router) { };

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    return next.handle(req).pipe(
      retry(1), // You can customize the number of retries here
      catchError((error) => {
        if (error) {
            // Perform actions with the error object according to your requirements
            return throwError(error); // Return the error without handling it in catch block
        }
     }
  }

If you want more detailed guidance on how to implement an interceptor with error handling, you can refer to this tutorial.

Answer 2

If you are looking to implement error handling in your Angular application, you can consider using the HTTPInterceptor - Interceptor functionality.

To get started, you would need to create a new file, let's call it "ErrorInterceptorService". In this file, you would define a class called "ErrorInterceptorService" that implements the HttpInterceptor interface. The constructor of this class should accept any necessary dependencies such as ToastrService and Router.

@Injectable({
  providedIn: 'root'
})
export class ErrorInterceptorService implements HttpInterceptor {

  constructor(private toastr: ToastrService, private router: Router) { };

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    return next.handle(req).pipe(
      retry(1), // You can customize the number of retries here
      catchError((error) => {
        if (error) {
            // Perform actions with the error object according to your requirements
            return throwError(error); // Return the error without handling it in catch block
        }
     }
  }

If you want more detailed guidance on how to implement an interceptor with error handling, you can refer to this tutorial.

Answer 3

Answer №2

A clever solution to avoid the need for service creation involves simply adding a comma and an error "subscription". This will trigger whenever there is an error, ensuring smooth functionality. So, let's keep coding with joy!

this.addService.log()
          .subscribe(event => {
            if (event instanceof HttpResponse) {
              // Take appropriate action
            } else if ( event instanceof HttpErrorResponse){ 
              console.log(`unable to process HttpErrorResponse`)
            } else if (event instanceof ErrorEvent){ 
              console.log(`unable to handle ErrorEvent`)
            }}, err=>{
                console.log(err)
                JSON.stringify(err)
            });
}

Answer 4

A clever solution to avoid the need for service creation involves simply adding a comma and an error "subscription". This will trigger whenever there is an error, ensuring smooth functionality. So, let's keep coding with joy!

this.addService.log()
          .subscribe(event => {
            if (event instanceof HttpResponse) {
              // Take appropriate action
            } else if ( event instanceof HttpErrorResponse){ 
              console.log(`unable to process HttpErrorResponse`)
            } else if (event instanceof ErrorEvent){ 
              console.log(`unable to handle ErrorEvent`)
            }}, err=>{
                console.log(err)
                JSON.stringify(err)
            });
}

Awaitable HttpResponseError

Answer №1

Answer №2

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