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HTTP Status Codes: The Complete Developer Guide
Understand every HTTP status code - 1xx, 2xx, 3xx, 4xx, and 5xx - with explanations and when to use each one.
February 15, 2024·9 min read
HTTP Status Code Categories
HTTP status codes are 3-digit numbers grouped into five categories:
2xx Success
- 200 OK - Standard success response
- 201 Created - Resource successfully created (POST/PUT)
- 204 No Content - Success with no response body (DELETE)
- 206 Partial Content - Range request fulfilled
3xx Redirects
- 301 Moved Permanently - SEO-friendly permanent redirect
- 302 Found - Temporary redirect
- 304 Not Modified - Cached response is still valid
- 307/308 - Preserve HTTP method during redirect
4xx Client Errors
- 400 Bad Request - Invalid request syntax
- 401 Unauthorized - Authentication required
- 403 Forbidden - Authenticated but not authorized
- 404 Not Found - Resource doesn't exist
- 422 Unprocessable Entity - Validation errors
- 429 Too Many Requests - Rate limit exceeded
5xx Server Errors
- 500 Internal Server Error - Generic server error
- 502 Bad Gateway - Proxy received invalid upstream response
- 503 Service Unavailable - Server temporarily down
- 504 Gateway Timeout - Upstream timeout
Browse all codes in our HTTP Status Codes reference.