HTTP Status Code Explorer

HTTP status codes are three-digit numbers returned by servers to indicate the result of a client's request.

The first digit defines the class of response:

• 1xx: Informational - Request received, continuing process
• 2xx: Success - Request successfully received, understood, and accepted
• 3xx: Redirection - Further action needed to complete request
• 4xx: Client Error - Request contains bad syntax or cannot be fulfilled
• 5xx: Server Error - Server failed to fulfill valid request

• 200 OK: Standard success response
• 201 Created: Resource successfully created
• 301 Moved Permanently: Permanent redirect
• 400 Bad Request: Invalid client request
• 401 Unauthorized: Authentication required
• 403 Forbidden: Server refuses to authorize
• 404 Not Found: Resource doesn't exist
• 500 Internal Server Error: Generic server error
• 503 Service Unavailable: Server temporarily down

• 401 vs 403: 401 means "not authenticated" (identity unknown), 403 means "not authorized" (identity known, lacks permission)
• 301 vs 302: 301 is permanent (update bookmarks), 302 is temporary (keep original URL)
• 200 for errors: Don't return 200 with error messages in body - use appropriate error codes

• Use the search box to find status codes by number, name, or keywords
• Click category buttons to filter by status code class (1xx, 2xx, etc.)
• Each card shows the code, description, and common use cases
• Examples show typical server responses and usage scenarios