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Code Meaning 1xx CODES - INFORMATION ONLY 100 - Continue; partial request received 101 - OK to switch protocols 2xx CODES - SUCCESS 200 - OK; all requested info returned 201 - Created; request filled 202 - Accepted; request received 203 - Source unknown; 3rd party info 204 - No new content; nothing to send 205 - Reset content; OK to clear form 206 - Request only partially filled 3xx CODES - REDIRECTION 300 - Header for 3xx codes 301 - Moved permanently; use new URL 302 - Moved temporarily; use same URL 303 - Redirected 304 - Not modified; use cached copy 305 - Use proxy; URL is provided 4xx CODES - FAILURE 400 - Did not understand request 401 - Password required 402 - Payment required 403 - Request refused 404 - Not found 406 - Content type not acceptable 407 - Browser must authenticate 408 - Timed out; send again 409 - Update conflict with explanation 410 - Not found; resource gone 411 - Content length missing 412 - Conditions on request failed 413 - Request too long to process 414 - Resource address too long 415 - Unsupported media type; bad format 5xx CODES - SERVER ERRORS 500 - Internal error 501 - Cannot fill request 502 - Cannot process gateway request 503 - Overloaded or service over limits 504 - Gateway or proxy server timed out 505 - HTTP version not supported