Adds a query param that changes on every call, so no HTTP cache between the phone and the
provider can hand back an old reply. Providers ignore the extra param.
The stamp goes before any #fragment, since nothing after the # reaches the server. A signed URL,
such as an S3 presigned link, is refused once the stamp changes its query. That costs a feed
served that way, where skipping the stamp would bring back the stale copies it is here to beat,
and the feeds calendars hand out are not signed.
Adds a query param that changes on every call, so no HTTP cache between the phone and the provider can hand back an old reply. Providers ignore the extra param.
The stamp goes before any #fragment, since nothing after the # reaches the server. A signed URL, such as an S3 presigned link, is refused once the stamp changes its query. That costs a feed served that way, where skipping the stamp would bring back the stale copies it is here to beat, and the feeds calendars hand out are not signed.