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Return of Server Push

- Updates61
 
I'm going to have to see what sort of data I get back for this, but server push is back in Gosora.

HTTP/2 Server Push is a feature which allows the server to immediately start pushing assets like scripts and stylesheets without having to wait for the browser to request them.

We originally had this feature on six months ago, but it got disabled due to caching concerns. It seems that this might not be a problem for modern Chrome and Firefox, so it's been switched on for those.

I will also see if if I can't throw together some simple heuristics for other browsers to try to at-least cover some cases where a user is clearly new and likely doesn't have cached assets in their browser.