Angular - Catching error after all HTTP retry failed

Question

I am using Angular Service to get data from my API. I implemented retry feature in case of fetching data fails. Now i need to handle the error when all the retr

Answer 1

    return this.http.get(callURL,{
      params: new HttpParams()
        .set('page', page)
        .set('limit', limit)
    }).pipe(
      retryWhen(genericRetryStrategy({maxRetryAttempts: 10, scalingDuration: 1})),
      catchError(this.handleError)
    );

Where genericRetryStrategy is from this retrywhen resource

export const genericRetryStrategy = ({
  maxRetryAttempts = 3,
  scalingDuration = 1000,
  excludedStatusCodes = []
}: {
  maxRetryAttempts?: number,
  scalingDuration?: number,
  excludedStatusCodes?: number[]
} = {}) => (attempts: Observable) => {
  return attempts.pipe(
    mergeMap((error, i) => {
      const retryAttempt = i + 1;
      // if maximum number of retries have been met
      // or response is a status code we don't wish to retry, throw error
      if (
        retryAttempt > maxRetryAttempts ||
        excludedStatusCodes.find(e => e === error.status)
      ) {
        return throwError(error);
      }
      console.log(
        `Attempt ${retryAttempt}: retrying in ${retryAttempt *
          scalingDuration}ms`
      );
      // retry after 1s, 2s, etc...
      return timer(retryAttempt * scalingDuration);
    }),
    finalize(() => console.log('We are done!'))
  );
};

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