When an HTTP error code occurs, which one is recommended to avoid retrying the request?

It is recommended to avoid retrying requests when receiving HTTP error codes 4xx, especially such as 401 Unauthorized or 403 Forbidden, as these errors indicate authorization or access issues that are not resolved by retries.

It is also advisable to avoid retries on 400 Bad Request errors, as the request is incorrect.

In contrast, 5xx errors (server errors) generally allow for retries, as the problem may be temporary.