Re: [slightlyoff/ServiceWorker] consider fetching service worker scripts with no-cache by default (#893)

So, for us the current behavior is actually kind of useful. When we push out new code for the site we'll slowly ramp things up and some Facebook servers will be on the newest version while some will be on the old version. In the middle of the code push for any individual request it's just as likely  that someone will hit new code or that they'll hit old code. For service workers this means that during code push we often see service workers constantly in the upgrade state. We have some mechanisms to ensure that we don't install an old version of the service worker, however we did still enter the install state more than is ideal. To solve this we actually cache the service worker script for an hour, this allows a level of stability that would otherwise be hard to achieve.

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