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HTTP status codes are grouped into five classes: 1xx Informational (request received, processing), 2xx Success (request accepted and processed), 3xx Redirection (further action needed), 4xx Client Error (bad request or unauthorized), and 5xx Server Error (server failed to fulfill a valid request). Understanding these classes helps quickly categorize API responses during debugging.
200 OK is the standard success response indicating that the request was received, understood, and processed successfully. It is the most common status code you will encounter when everything works correctly. The response body typically contains the requested resource data. Different HTTP methods return different content — GET returns data, POST returns the created resource.
404 Not Found indicates that the server cannot find the requested resource at the specified URL. This could mean the URL is incorrect, the resource has been deleted, or the route does not exist. It is one of the most well-known HTTP status codes and is different from 410 Gone, which explicitly indicates a permanently removed resource.
