Add cache-control header and use async for Browser Insight JS

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Cloudflare injects the script https://static.cloudflareinsights.com/beacon.min.js for Browser Insight.

Currently, this JS is loaded with defer attribute, I wonder if this JS could be loaded with async attribute instead, since JS with async attribute won’t impact pages loading at all while JS with defer might have impact on DOMContentLoad timing.

Also, the URL https://static.cloudflareinsights.com/beacon.min.js for Browser Insight has no Cache-Control header thus it can not be cached by Browser. I wonder if it Cloudflare could make it cacheable for Browser by adding Cache-Control header.

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