This feature has been deprecated. Use
to polyfill deprecated features.
The server may send this optional response header to control which previously cached responses should be expired after this response.
The value of this header is a URL pattern matching responses that should be expired.
For example, to expire all responses to URLs starting with
If the server does not send an
X-Up-Clear-Cache header, Unpoly will expire the entire cache after a non-GET request.
You may force Unpoly to keep the cache fresh after a non-GET request: