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 /notes/:
X-Up-Clear-Cache: /notes/*
Overriding the client-side default
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:
X-Up-Clear-Cache: false
