monitor: fix issue with url cached in browser using wrong domain
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.
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