Question

How can I retry failed HTTP requests using RxJS in Angular?

I'm working with HTTP requests in my Angular app and need to retry requests that fail. How can I implement retry logic using RxJS?

Answer 1

To implement retry logic, Angular provides a powerful operator called retry from the RxJS library. You can specify how many times to try a failed request with this operator.

Basic Retry Implementation

Here’s a simple example of how to use the retry operator in your service:

import { HttpClient } from '@angular/common/http';

import { Injectable } from '@angular/core';

import { catchError, retry } from 'rxjs/operators';

import { throwError } from 'rxjs';

@Injectable({

  providedIn: 'root',

})

export class ApiService {

  constructor(private http: HttpClient) {}

  getData() {

    return this.http.get('https://api.example.com/data').pipe(

      retry(2), // Retry the request up to 2 times

      catchError(this.handleError) // Handle errors

    );

  }

  private handleError(error: any) {

    console.error('An error occurred:', error);

    return throwError('Something went wrong; please try again later.');

  }

}