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How do you handle errors and retries globally with interceptors?

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01

Understand the problem

Explain error interceptors.

interceptorretry
02

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03

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In an interceptor, pipe the request with catchError to transform/log errors and retry/retryWhen to re-attempt transient failures (e.g. exponential backoff on 503), centralizing resilience and error handling across all HTTP calls.

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04

Read the code

Global retry + error interceptor
import { HttpInterceptorFn } from '@angular/common/http';
import { catchError, retry, throwError } from 'rxjs';

export const errorInterceptor: HttpInterceptorFn = (req, next) =>
  next(req).pipe(
    retry({ count: 2, delay: 1000 }),       // transient failures only
    catchError(err => {
      if (err.status === 401) location.href = '/login';
      console.error('HTTP error', err.status);
      return throwError(() => err);          // re-throw for the caller
    }),
  );
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