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Common HTTP Status Codes
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503
Service Unavailable – The server is currently unable to handle the request due to a temporary overloading or maintenance of the server.
401
Unauthorized – The request has not been applied because it lacks valid authentication credentials for the target resource.
403
Forbidden – The server understood the request but refuses to authorize it.
502
Bad Gateway – The server was acting as a gateway or proxy and received an invalid response from the upstream server.
451
Unavailable For Legal Reasons – The server is denying access to the resource as a consequence of a legal demand.
500
Internal Server Error – The server encountered an unexpected condition which prevented it from fulfilling the request.
201
Created – The request has succeeded and a new resource has been created as a result.
204
No Content – The server successfully processed the request, but is not returning any content.
304
Not Modified – Indicates that the resource has not been modified since the last request.
408
Request Timeout – The server did not receive a complete request message within the time that it was prepared to wait.
301
Moved Permanently – The URL of the requested resource has been changed permanently, and the new URL is given.
400
Bad Request – The server cannot process the request due to a client error (e.g., malformed request syntax).
405
Method Not Allowed – The method specified in the request-line is not allowed for the resource identified by the request URI.
200
OK – The request has succeeded, and the client receives the requested data.
429
Too Many Requests – The user has sent too many requests in a given amount of time ('rate limiting').
418
I'm a teapot – The server refuses to brew coffee because it is permanently a teapot (part of an April Fools' joke).
426
Upgrade Required – The client should switch to a different protocol such as TLS/1.0, given in the Upgrade header field.
302
Found – The server has found a temporary redirection. The URL is given, but the client should continue to use the original URL.
404
Not Found – The server has not found anything matching the request URI.
504
Gateway Timeout – The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.
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