monitor: fix issue with url cached in browser using wrong domain
Alain Takoudjou authored
The problem is explaned here: https://bugs.chromium.org/p/chromium/issues/detail?id=260239

The use of header Vary: Origin dosen't fix the problem on chrome so I disabled the cache
with Pragma "no-cache". This doesn't cause issue because most of monitor files are
modified every minutes and sync happen at least every 5 minutes. So the better solution
is to disable cached.
aa221edd

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