Browser HTML codes and error codes
If your Web browser is giving you an error message/number that you are not familiar with feel free to check this list of codes to see what it means. This may be useful in diagnosing any problems you might experience.
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.
This following is new in HTTP/1.1
300's - Redirected requests are those with other codes in the 300s. 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).
Here are the most common 300 Error
Codes :
- 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.
Here are the most common 400 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.
Here are the most common 500 (and
beyond) 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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