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HTTP Status Codes

When a client (browser) requests a page from a web server, various status codes are included in the messages that are sent back and forth. These messages can be used to help troubleshoot issues preventing web pages from properly being delivered to the browser.

Some browsers are configured by default to not show these messages, but rather show a friendly form of the status code. Generally, you can disable the friendly messages in the advanced configuration of the browser. Here is a list of status codes that may be exchanged.

1xx Information

Status CodeDescription
100 ContinueThis interim response is used to inform the client that the initial part of the request has been received.
101 Switching ProtocolsThe requester has asked the server to switch protocols.

2xx: Successful

Status CodeDescription
200 OKThe request has succeeded.
201 CreatedThe request has been fulfilled and resulted in a new resource being created.
202 AcceptedThe request has been accepted for processing, but the processing has not been completed.
203 Non-Authoritative InformationThe request has been fulfilled but is returning information that may be from another source.
204 No ContentThe request has been successfully fulfilled but is not returning any content.
205 Reset ContentThe request has been successfully fulfilled but s not returning any content.
206 Partial ContentThe server is delivering only part of the resource due to a range header sent by the client.

3xx: Redirection

Status CodeDescription
300 Multiple ChoicesThe user can select a link and go to that location. Max of five addresses.
301 Moved PermanentlyThe requested page has moved to a new URI.
302 FoundThe requested page has moved temporarily to a new URI.
303 See OtherThe requested page can be found under a different URI.
304 Not ModifiedIndicates the requested page has not been modified since last requested.
305 Use ProxyThe requested resource must be accessed through the proxy given by the Location field.
307 Temporary RedirectThe requested page has moved temporarily to a new URI.
308 Resume IncompleteUsed in the resumable requests proposal to resume aborted PUT or POST requests.

4xx: Client Error

Status CodeDescription
400 Bad RequestThe request cannot be fulfilled due to malformed syntax.
401 UnauthorizedThe request requires user authentication.
402 Payment RequiredReserved for future use.
403 ForbiddenThe server understood the request but is refusing to fulfill it.
404 Not FoundThe server has not found anything matching the Request-URI.
405 Method Not AllowedThe method specified in the Request-Line is not allowed for the resource.
406 Not AcceptableThe server can only generate a response that is not accepted by the client.
407 Proxy Authentication RequiredThe client must first authenticate itself with the proxy.
408 Request TimeoutThe server timed out waiting for the request.
409 ConflictThe request could not be completed because of a conflict in the request.
410 GoneThe requested page is no longer available and no forwarding address is known.
411 Length RequiredThe server refuses to accept the request without a defined Content-Length.
412 Precondition FailedThe precondition given in the request evaluated to false by the server.
413 Request Entity Too LargeThe server will not accept the request, because the request entity is too large.
414 Request-URI Too LongThe server will not accept the request, because the URI is too long.
415 Unsupported Media TypeThe server will not accept the request, because the media type is not supported.
416 Requested Range Not SatisfiableThe client has asked for a portion of the file, but the server cannot supply that portion.
417 Expectation FailedThe server cannot meet the requirements of the Expect request-header field.

5xx: Server Error

Status CodeDescription
500 Internal Server ErrorThe server encountered an unexpected condition that prevented it from fulfilling the request.
501 Not ImplementedThe server does not support the functionality required to fulfill the request.
502 Bad GatewayThe server was acting as a proxy and received an invalid response from the upstream server.
503 Service UnavailableThe server is currently unable to handle the request due to temporary overloading or maintenance.
504 Gateway TimeoutThe server was acting as a proxy or and did not receive a timely response from the upstream server.
505 HTTP Version Not SupportedThe server does not support the HTTP protocol version that was used in the request message.

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