Liens

1xx Informational Status Codes

Codes	Titres	Explications
200	OK
204	No Content

Codes	Titres	Explications
301	Moved Permanently
302	Found	The requested resource resides temporarily in another location, but it can still be found at the requested URI.
304	Not Modified	If the client has performed a conditional GET request and access is allowed, but the document has not been modified, the server should respond with this status code.

Codes	Titres	Explications
400	Bad Request	The server cannot or will not process the request due to an apparent client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing)
401	Unauthorized	login / password incorrect
403	Forbidden	règle interdisant l'accès
404	Not Found	l'uri demandé ne correspond à aucun fichier
422	Unprocessable Entity	The request was well-formed but was unable to be followed due to semantic errors. (ex: invalid data)

Codes	Titres	Explications
500	Internal server error	???
502	Bad Gateway	Mauvaise réponse envoyée à un serveur intermédiaire par un autre serveur
503	Service Unavailable	le serveur ne peut traiter la requête car il est momentanément surchargé

Codes	Titres	Explications
444	No Response	Used in Nginx logs to indicate that the server has returned no information to the client and closed the connection (useful as a deterrent for malware).
494	Request Header Too Large	Nginx internal code similar to 431 (Request Header Fields Too Large) but it was introduced earlier.
495	Cert Error	Nginx internal code used when SSL client certificate error occurred to distinguish it from 4XX in a log and an error page redirection.
496	No Cert	Nginx internal code used when client didn't provide certificate to distinguish it from 4XX in a log and an error page redirection.
497	HTTP to HTTPS	Nginx internal code used for the plain HTTP requests that are sent to HTTPS port to distinguish it from 4XX in a log and an error page redirection.
499	Client Closed Request	Used in Nginx logs to indicate when the connection has been closed by client while the server is still processing its request, making server unable to send a status code back.
502	Bad Gateway	Le service Fast CGI (pour PHP, ASP ou autres) n'est pas lancé.