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A status code that indicates a provisional response and requires the requester to continue the operation.
Code Description
100 (Continue) The requester should continue with the request. The server returns this code to indicate that it has received the first part of the request and is waiting for the rest.
101 (Switching Protocol) The requester has asked the server to switch protocols, and the server has confirmed and is ready to switch.
2xx (Successful)
Status code indicating that the request was successfully processed.
Code Description
200 (Successful) The server successfully processed the request. Typically, this means that the server provided the requested web page.
201 (Created) The request was successful and the server created a new resource.
202 (Accepted) The server has accepted the request but has not yet processed it.
203 (Unauthorized Message) The server has successfully processed the request, but the information returned may have come from another origin.
204 (No Content) The server successfully processed the request but did not return any content.
205 (Reset Content) The server successfully processed the request but did not return any content.
206 (Partial Content) The server successfully processed part of the GET request.
3xx (Redirection)
Indicates that further action is required to complete the request. Typically, these status codes are used for redirection.
Code Description
300 (Multiple Choices) The server can perform multiple operations in response to the request. The server can select an operation based on the requester (user agent) or provide a list of operations for the requester to choose from.
301 (Moved Permanently) The requested page has been permanently moved to a new location. When the server returns this response (to a GET or HEAD request), it automatically forwards the requester to the new location.
302 (Temporary Move) The server is currently responding to requests from a different location, but the requester should continue to use the original location for future requests.
303 (See Other Locations) The server returns this code when the requester should use a separate GET request to a different location to retrieve the response.
304 (Not Modified) The requested web page has not been modified since the last request. When the server returns this response, no web page content is returned.
305 (Use Proxy) The requester can only access the requested web page using a proxy. If the server returns this response, it also indicates that the requester should use a proxy.
307 (Temporary Redirect) The server is currently responding to the request from a web page at a different location, but the requester should continue to use the original location for future requests.
4xx (Bad Request)
These status codes indicate that something might have gone wrong with the request, preventing the server from processing it.
Code Description
400 (Bad Request) The server did not understand the syntax of the request.
401 (Unauthorized) The request requires authentication. For web pages that require login, the server may return this response.
403 (Forbidden) The server rejected the request.
404 (Not Found) The server cannot find the requested webpage.
405 (Method Forbidden) The method specified in the request is forbidden.
406 (Not Acceptable) The requested web page cannot be responded to with the requested content characteristics.
407 (Proxy Authorization Required) This status code is similar to 401 (Unauthorized), but specifies that the requester should authorize the use of a proxy.
408 (Request Timeout) The server timed out while waiting for the request.
409 (Conflict) The server encountered a conflict while completing the request. The server MUST include information about the conflict in its response.
410 (Deleted) The server returns this response if the requested resource has been permanently deleted.
411 (Valid Length Required) The server did not accept a request without a valid Content-Length header field.
412 (Precondition Failed) The server did not meet one of the preconditions set by the requester in the request.
413 (Request Entity Too Large) The server cannot process the request because the request entity is too large for the server to handle.
414 (Requested URI Too Long) The requested URI (usually a URL) is too long for the server to process.
415 (Unsupported Media Type) The requested format is not supported by the requested page.
416 (Requested Range Not Qualified) The server returns this status code if the page cannot provide the requested range.
417 (Expectation Failed) The server did not meet the requirements of an "Expect" request-header field.
5xx (Server Error)
These status codes indicate that an internal error occurred while the server was trying to process the request. These errors may be errors with the server itself, rather than errors with the request.
Code Description
500 (Internal Server Error) The server encountered an error and could not complete the request.
501 (Not Implemented) The server does not have the functionality to complete the request. For example, the server might return this code if it does not recognize the request method.
502 (Bad Gateway) The server, while acting as a gateway or proxy, received an invalid response from an upstream server.
503 (Service Unavailable) The server is currently unavailable (either because it is overloaded or down for maintenance). Usually, this is only a temporary condition.
504 (Gateway Timeout) The server was acting as a gateway or proxy, but did not receive the request from the upstream server in a timely manner.
505 (Unsupported HTTP Version) The server does not support the HTTP protocol version used in the request.
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