Name

Warning

Synopsis

                        Warning: code 
                        host[:port] string
                     

Indicates additional information to that in the status code, for use by caching proxies. The host field contains the name or pseudonym of the server host, with an optional port number. The two-digit warning codes and their recommended descriptive strings are:

10 Response is stale 2n

The response data is known to be stale.

11 Revalidation failed 2n

The response data is known to be stale because the proxy failed to revalidate the data.

12 Disconnected operation 2n

The cache is disconnected from the network.

13 Heuristic expiration 2n

The data is older than 24 hours, and the cache heuristically chose a freshness lifetime greater than 24 hours.

14 Transformation applied 2n

The proxy has changed the encoding or media type of the document, as specified by the Content-Encoding or Content-Type headers.

99 Miscellaneous warning 2n

Arbitrary information to be logged or presented to the user.

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