# HTTP status code reference

Look up any HTTP status code, what it means, and whether a client should retry.

## How it works

Codes in the 2xx range mean success, 3xx a redirect, 4xx a problem with the request and 5xx a problem on the server.

## Questions

### Should I retry a 500?

Only if the request is safe to repeat, and with backoff. A 503 or 429 with Retry-After is meant to be retried.

### 401 or 403?

401 means not signed in or bad credentials; 403 means signed in but not allowed.

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