fix: add headers to avoid faulty redirects to global shell [11.x] #917
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Part of DHIS2-19412
Adds
X-Requested-With = iframeheader, but by creating the request in the service worker itself, it also results inReferer = .../service-worker.js, which is convenient.Tested with these conditions, in v41, v42 in a global shell, and v42 with
?redirect=falsefor the standalone app:Some other details of the request are changed too, as shown by this table, but I think they're okay:

Before:

After:
