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Error Codes
If your web browser is returning an error message when you try and load a file or run a script on your
site, or you are poking around your log files wondering what all those error numbers mean,
then this list may help you determine where the problem lies.
HTML Error Codes:
- 200 - OK - Successful transmission. This is not an error. The file you requested was found, here it is.
- 201 - Created - The request has been fulfilled and resulted in a new resource being created. The newly
created resource can be referenced by the URL(s) returned in the URL-header field of the response, with the
most specific URL for the resource given by a Location header field.
- 202 - Accepted - The request has been accepted for processing, but the processing has not yet completed.
- 203 - Non-Authoritative Information - The returned META information in the Entity-Header is not the
definitive set as available from the origin server, but is gathered from a local or third-party copy.
- 204 - No Content - The server has fulfilled the request, but there is no new information to send back.
- 206 - Partial Content - you requested a range of bytes in the file, and here they are.
300's Error Codes:
- 300's - Redirected requests are those with other codes in the 300's. The most common cause of these
requests is that the user has incorrectly requested a directory name without the trailing slash. The server
replies with a redirection ("you probably mean the following") and the user then makes a second connection
to get the correct document (although usually the browser does it automatically without the user's
intervention or knowledge). If you have a large number of 300 level result codes in your logs, you
have probably specified links without the trailing "/" (slash).
- 300 - Multiple Choices - The requested source is available at one or more locations and a preferred
location could not be determined via content negotiation.
- 301 - Moved Permanently - The requested resource has been assigned a new permanent URL and any future
references to this resource should be done using one of the returned URLs.
- 302 - Moved Temporarily - The requested resource resides temporarily under a new URL. Redirection to a
new URL. The original page has moved. This is not an error, most browsers invisibly fetch the new page upon
seeing this result.
- 303 - See Other - The requested resource resides under a different URL and should be accessed using a
Get method on that resource.
- 304 - Not Modified - If the client has performed a conditional GET request and access is allowed,
but the document has not been modified since the date and time specified in the If-Modified-Since field,
the server responds with this status code and does not send an Entity-Body to the client. Use local
copy. This means that the copy of the file on the web server is not newer than the copy which your
web browser or proxy server has cached locally, so there's no point in sending the file again. This
is not an error. The file hasn't changed since the last time you asked for it, so I'm not going to
send it again.
400's Error Codes:
- 400 - Bad Request - The request could not be understood by the server due to it having a malformed
syntax. Bad request was made by the client.
- 401 - Unauthorized - The request requires user authentication. The response must include a
WWW-Authenticate header field containing a challenge applicable to the requested source. The user
asked for a document but did not provide a valid username or password.
- 402 - Payment Required - This code is not currently supported, but is reserved for future use.
- 403 - Forbidden - The server understood the request but is refusing to perform the request because
of an unspecified reason. Access is explicitly denied to this document. (This might happen because the
web server doesn't have read permission for the file you're requesting). The server refuses to send you
this file. Maybe permission has been explicitly turned off.
- 404 - Not Found - The server has not found anything matching the requested URL. This file doesn't
exist. What you get if you give a bad URL to your browser. This can also be sent if the server has
been told to protect the document by telling unauthorized people that it doesn't exist. 404 errors
are the result of requests for pages which do not exist, and can come from a mistyped URL, a bookmark
which points to a file no longer there, search engines looking for a robots.txt (which is used to mark
pages you don't want indexed by search engines), people guessing filenames, bad links from your site
or other sites, etc.
- 405 - Method Not Allowed - The method specified in the request line is not allowed for the resource
identified by the requested URL.
- 406 - None Acceptable - The server has found a resource matching the request URL, but not one that
satisfies the conditions identified by the Accept and Accept-Encoding request headers.
- 407 - Proxy Authentication Required - This code is reserved for future use. It is similar to
401 (Unauthorized) but indicates that the client must first authenticate itself with a proxy. HTTP/1.0
does not provide a means for proxy authentication.
- 408 - Request Timeout - The client did not produce a request within the time the server was
prepared to wait.
- 409 - Conflict - The request could not be completed due to a conflict with the
current state of the resource.
- 410 - Gone - The requested resource is no longer available at the server and no forwarding
address is known.
- 411 - Authorization Refused - The request credentials provided by the client were rejected by the
server or insufficient to grant authorization to access the resource.
500's+ Error Codes:
- 500 - Internal Server Error - The server encountered an unexpected condition that prevented it
from filling the request. Something went wrong with the web server and it couldn't give you a meaningful
response. There is usually nothing that can be done from the browser end to fix this error; the server
administrator will probably need to check the server's error log to see what happened. This is often
the error message for a CGI script which has not been properly coded.
- 501 - Not Implemented - The server does not support the functionality required to fulfill the
request. Application method (either GET or POST) is not implemented.
- 502 - Bad Gateway - The server received an invalid response from the gateway or upstream server it
accessed in attempting to fulfill the request.
- 503 - Service Unavailable - The server is currently unable to handle the request due to a
temporary overloading or maintenance of the server. Server is out of resources.
- 504 - Gateway Timeout - The server did not receive a timely response from the gateway or upstream
server it accessed in attempting to complete the request.
- 8181 - Certificate has expired (secure server only).
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