When working with APIs, response codes are essential for understanding the outcome of a request. Here’s a quick guide to some of the most common HTTP response codes and what they mean:
Informational
100 Continue – The server received the request headers and is waiting for the body.
101 Switching Protocols – The client requested a protocol change, and the server agreed.
Success
200 OK – The request was successful.
201 Created – A new resource was successfully created.
204 No Content – The request was successful, but there’s no response body.
Redirection
301 Moved Permanently – The resource has a new permanent URL.
302 Found – The resource is temporarily available at a different URL.
304 Not Modified – The resource hasn’t changed since the last request.
Client Errors
400 Bad Request – The request was invalid or improperly formatted.
401 Unauthorized – Authentication is required.
403 Forbidden – The request is valid, but access is denied.
404 Not Found – The requested resource doesn’t exist.
429 Too Many Requests – The client has hit the rate limit.
Server Errors
500 Internal Server Error – A generic server-side error occurred.
502 Bad Gateway – The server acting as a gateway received an invalid response.
503 Service Unavailable – The server is overloaded or under maintenance.
504 Gateway Timeout – The server didn’t respond in time.
Understanding API response codes helps with debugging and handling errors efficiently. Always check the response when integrating with an API to ensure smooth communication.