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; part of 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; info came from 3rd party
204 - No new content; nothing to send back
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 since; use cached copy
305 - Use proxy; URL is provided
4xx CODES - FAILURE
400 - Did not understand request; try again
401 - Authorization required; needs password
402 - Payment required; needs payment data
403 - Request refused; may not give reason
404 - Not found; not sure of reason (typo, etc.)
406 - Content type not acceptable to request
407 - Browser must authenticate itself
408 - Timed out; send request again
409 - Update conflict; explanation provided
410 - Not found; resource permanently gone
411 - Content length missing in request
412 - Conditions on request failed
413 - Request too long to process
414 - Resource address too long to process
415 - Unsupported media type; bad format
5xx CODES - SERVER ERRORS
500 - Internal server error
501 - Server cannot fill request
502 - Server cannot process gateway request
503 - Server overloaded or service over limits
504 - Gateway or proxy server timed out
505 - HTTP version not supported in server
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