A status code that is returned from the Web server (HTTP server) to the client program, typically the browser. It indicates the status of the request and reports errors and necessary information so that the client software can respond.
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