The server may set this response header to set a custom browser location after a fragment update.
Without an X-Up-Location header Unpoly will set the browser location to the
requested URL. After a redirect the URL of the last request is used.
You only need to set X-Up-Location when you want to explicitly set a different URL.
When setting X-Up-Location it is recommended to also set X-Up-Method.
X-Up-Location: /current-url
X-Up-Method: GET
The URL may contain a #hash, e.g. X-Up-Location: /users#alice. Unpoly then
reveals the element with that ID, like after following a link to /users#alice.
A #hash in this header replaces any #hash of the requested URL.
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