HTTP Status Code Lookup

HTTP status codes are 3-digit numbers returned by a server in response to a client request. They indicate whether the request succeeded, failed, or needs further action.

401 Unauthorized means authentication is required (you're not logged in). 403 Forbidden means you're authenticated but don't have permission to access that resource.

A 502 Bad Gateway means the server acting as a gateway received an invalid response from the upstream server. Common causes include crashed backend services or load balancer misconfigurations.

429 is returned when you've exceeded the rate limit set by an API. Solutions include adding exponential backoff, caching responses, or requesting a higher rate limit from the API provider.