Understanding HTTP Errors

This guide allows you to understand the different HTTP status codes.

1xx - Information

error 100: OK to continue
The server has received the request headers and the client can continue to send the request body.

error 101: The server has changed protocols
The server agrees to change the communication protocol according to the client's request.

2xx - Successes

error 200: Request completed successfully
The request was successfully processed by the server.

error 201: Document created (reason: new URI)
The request was successful and resulted in the creation of a new resource.

error 202: Asynchronous completed request (TBS)
The request was accepted but the processing has not yet been completed.

error 203: Request incompletely completed
The server successfully processed the request, but the returned information comes from a third-party source.

error 204: No information to return
The request was successfully processed, but there is no content to return.

error 205: Request completed but blank form
The server successfully processed the request and asked the client to reset the document that submitted the request.

error 206: Incomplete GET request
The server returns only part of the data, as requested by the client with the header Range.

3xx - Redirections

error 300: The server cannot determine the return code
The request has several possible answers, and the server cannot automatically choose one of them.

Error 301: Permanently moved document
The requested resource has been permanently moved to a new URL.

error 302: Document temporarily moved
The requested resource is temporarily located at another URL.

error 303: Redirect with new access method
The response to the query can be found under another URL using a method GET.

Error 304: The field 'If-Modified-Since' was not modified
The resource has not changed since the last request. No new data will be returned.

error 305: Redirect to a proxy specified by the header
The requested resource must be accessed by a specified proxy.

error 307: Temporary redirection
The requested resource is temporarily located under another URL, but the client must use the same method to perform the next request.

4xx - Customer Errors

error 400: Syntax error in document address
The request is incorrect or ill-formed.

error 401: No permission to access the document
Access to the resource requires authentication.

error 402: Access to the document submitted for payment
This code is reserved for future use with respect to online payments.

error 403: No server access permission
The server understands the request but refuses to allow it.

error 404: The page requested does not exist
The server can't find the requested resource.

error 405: Request method of the unauthorized form
The method specified in the request is not allowed for the resource.

error 406: Request not accepted by the server
The requested resource is not able to generate acceptable content according to the headers Accept sent in the request.

error 407: Proxy authorization required
Access to the resource requires proxy authentication.

error 408: Access time to page requested expired
The server did not receive the complete request within the specified time.

error 409: User must resubmit with more info
The request cannot be dealt with because of a conflict with the current state of the resource.

error 410: This resource is no longer available
The requested resource is no longer available on an ongoing basis.

error 411: The server refused the request because it has no length
The server refuses to process the request without a header Content-Length valid.

error 412: The precondition given in the query failed
One of the conditions specified in the query headers failed.

error 413: The entity of the request was too large
The server refuses to process the request because the size of the entity is too large.

error 414: The URI of the query was too long
The server refuses to process the request because the URI is too long.

error 415: Type of media not managed
The server refuses to process the request because the format of the query entity is not supported.

5xx - Server Errors

error 500: Internal server error
The server encountered an unexpected condition that prevented it from processing the request.

error 501: Request made to the unsupported server
The server does not support the functionality required to process the request.

error 502: Bad access gateway
The server, as a gateway or proxy, received an invalid response from the upstream server.

error 503: Service not available
The server is not available at the moment (overload or maintenance).

error 504: Access time to the expired gateway
The server, as a gateway or proxy, did not receive a timely response from the server upstream.

error 505: HTTP version not managed
The server does not support the HTTP protocol version used in the request.