Error Codes

Error codes and their descriptions:

Error Code 300 [Multiple Choices]
Description: Description:The URI refers to more than one file. The server may respond with an error message or a list of options.

Error Code 301 [Moved Permanently]
Description: The page has been permanently moved. The client will normally perform a redirection to the new URL. References to the old URL should be updated.

Error Code 302 [Moved Temporarily]
Description: The page has been temporarily moved. The client will normally perform a redirection to the new URL.

Error Code 303 [See Other]
Description: The server has received the request, and the response can be found using a GET request at another URI.

Error Code 304 [Not Modified]
Description: The file has not been modified since it was last requested. This response may be sent after a request containing an If-Modified-Since header.

Error Code 305 [Use Proxy]
Description: The client should repeat the request using the proxy. Many HTTP clients do not correctly handle responses with this status code, primarily for security reasons.

Error Code 307 [Temporary Redirect]
Description: The request should be repeated with another URI, but future requests should still use the original URI.

Error Code 308 [Permanent Redirect]
Description: The request, and all future requests should be repeated using another URI.

Error Code 400 [Bad Request]
Description: The request contains a syntax error and is denied.

Error Code 401 [Unauthorized]
Description: The request header did not contain the authentication codes required for this resource, and access is denied.

Error Code 402 [Payment Required]
Description: Reserved for future use. Intended to indicate that some form of payment is required before access is granted to this resource.

Error Code 403 [Forbidden]
Description: The client does not have the necessary permission to access the resource. Occasionally this response is issued when the server does not want any more visitors.

Error Code 404 [Not Found]
Description: The resource could not be found on the server. May be caused by misspelling a URI, or requesting a resource that has been deleted.

Error Code 405 [Method Not Allowed]
Description: The method used when requesting a resource, is not supported by that resource; for example, using GET on a form which requires POST access.

Error Code 406 [Not Acceptable]
Description: The requested resource exists but is not acceptable to the client according to the Accept headers sent in the request.

Error Code 407 [Proxy Authentication Required]
Description: The client must be authenticated with the proxy before making this request.

Error Code 408 [Request Timeout]
Description: The server timed out waiting for the client to complete the request.

Error Code 409 [Conflict]
Description: The request could not be processed because of a conflict, such as an edit conflict, or too many concurrent requests.

Error Code 410 [Gone]
Description: The requested file is no longer available at this URI. The client should not request the resource again in the future.

Error Code 411 [Length Required]
Description: The request did not include the required Content-Length header.

Error Code 412 [Precondition Failed]
Description: The request contained a precondition specification which the server does not meet.

Error Code 413 [Request Entity Too Large]
Description: The request contains more information than the server is willing or able to process.

Error Code 414 [Request-URI Too Long]
Description: The URI provided was too long for the server to process.

Error Code 415 [Unsupported Media Type]
Description: The request has a file type which the server does not support.

Error Code 416 [Requested Range Not Satisfiable]
Description: The client requested a portion of the file, but the server cannot supply that portion. For example, the client may have asked for data that lies beyond the end of the file.

Error Code 417 [Expectation Failed]
Description: An Expect request-header field cannot be satisfied by the server.

Error Code 420 [Enhance Your Calm]
Description: Unofficial code returned by Twitter API when the client is being rate limited.

Error Code 422 [Unprocessable Entity]
Description: The request was well-formed but was contained semantic errors which made it unprocessable.

Error Code 423 [Locked]
Description: The requested resource is locked.

Error Code 424 [Failed Dependency]
Description: The request failed due to the failure of a previous request.

Error Code 429 [Too Many Requests]
Description: The user has made requests too rapidly. Used with rate limiting schemes.

Error Code 431 [Request Header Fields Too Large]
Description: Either an individual header field, or all the header fields collectively, are too large.

Error Code 450 [Blocked by Windows Parental Controls]
Description: A Microsoft extension indicating that Parental Controls are blocking access to the resource.

Error Code 500 [Internal Server Error]
Description: A non-specified error occured when generating the response.

Error Code 501 [Not Implemented]
Description: The server cannot fulfill the request.

Error Code 502 [Bad Gateway]
Description: The gateway or proxy server received an error response from the upstream server.

Error Code 503 [Service Unavailable]
Description: The resource is currently unavailable.

Error Code 504 [Gateway Timeout]
Description: The gateway or proxy server timed out waiting for a response from the upstream server.

Error Code 505 [HTTP Version Not Supported]
Description: The server does not support the HTTP protocol version used in the request.

Error Code 506 [Variant Also Negotiates]
Description: This results from a configuration error on the server.

Error Code 507 [Insufficient Storage]
Description: The server cannot store the information needed to complete the request.

Error Code 509 [Bandwidth Limit Exceeded]
Description: Unofficial error code, indicating bandwidth allocation has been or will soon be exceeded.

Error Code 510 [Not Extended]
Description: The request contains a mandatory extension policy which is not accepted by the server.

Error Code 999 [Non-standard]
Description: This non-standard code is returned by some sites (e.g. linkedin) which do not permit scanning.