Response code
|
Meaning
|
2xx
Successful
|
Response
codes between 200 and 299 indicate that the request was received, understood,
and accepted.
|
200 OK
|
This is the
most common response code. If the request used GET or POST, the requested
data is contained in the response along with the usual headers. If the
request used HEAD, only the header information is included.
|
201 Created
|
The server
has created a data file at a URL specified in the body of the response. The
web browser should now attempt to load that URL. This is sent only in
response to POST requests.
|
202 Accepted
|
This rather
uncommon response indicates that a request (generally from POST) is being
processed, but the processing is not yet complete so no response can be
returned. The server should return an HTML page that explains the situation
to the user, provides an estimate of when the request is likely to be
completed, and, ideally, has a link to a status monitor of some kind.
|
204 No
Content
|
The server
has successfully processed the request but has no information to send back to
the client. This is usually the result of a poorly written form-processing
program that accepts data but does not return a response to the user
indicating that it has finished.
|
3xx
Redirection
|
Response
codes from 300 to 399 indicate that the web browser needs to go to a
different page.
|
300 Multiple
Choices
|
The page
requested is available from one or more locations. The body of the response
includes a list of locations from which the user or web browser can pick the
most appropriate one. If the server prefers one of these locations, the URL
of this choice is included in a Location header, which web browsers can use
to load the preferred page.
|
301 Moved
Permanently
|
The page has
moved to a new URL. The web browser should automatically load the page at
this URL and update any bookmarks that point to the old URL.
|
302 Moved
Temporarily
|
This unusual
response code indicates that a page is temporarily at a new URL but that the
document's location will change again in the foreseeable future, so bookmarks
should not be updated.
|
304 Not
Modified
|
The client
has performed a GET request but used the If-Modified-Since header to indicate
that it wants the document only if it has been recently updated. This status
code is returned because the document has not been updated. The web browser
will now load the page from a cache.
|
4xx Client
Error
|
Response
codes from 400 to 499 indicate that the client has erred in some fashion,
although the error may as easily be the result of an unreliable network
connection as of a buggy or nonconforming web browser. The browser should
stop sending data to the server as soon as it receives a 4xx response. Unless
it is responding to a HEAD request, the server should explain the error
status in the body of its response.
|
400 Bad
Request
|
The client
request to the server used improper syntax. This is rather unusual, although
it is likely to happen if you're writing and debugging a client.
|
401
Unauthorized
|
Authorization,
generally username and password controlled, is required to access this page.
Either the username and password have not yet been presented or the username
and password are invalid.
|
403
Forbidden
|
The server
understood the request but is deliberately refusing to process it.
Authorization will not help. One reason this occurs is that the client asks
for a directory listing but the server is not configured to provide it, as
shown in Figure
3-1.
|
404 Not
Found
|
This most
common error response indicates that the server cannot find the requested
page. It may indicate a bad link, a page that has moved with no forwarding
address, a mistyped URL, or something similar.
|
5xx Server
Error
|
Response
codes from 500 to 599 indicate that something has gone wrong with the server,
and the server cannot fix the problem.
|
500 Internal
Server Error
|
An
unexpected condition occurred that the server does not know how to handle.
|
501 Not
Implemented
|
The server
does not have the feature that is needed to fulfill this request. A server
that cannot handle POST requests might send this response to a client that
tried to POST form data to it.
|
502 Bad
Gateway
|
This
response is applicable only to servers that act as proxies or gateways. It
indicates that the proxy received an invalid response from a server it was
connecting to in an effort to fulfill the request.
|
503 Service
Unavailable
|
The server
is temporarily unable to handle the request, perhaps as a result of
overloading or maintenance.
|
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