Significantly improves performance of Google Fonts:
- Rewrites the HTML and puts the browser-specific Google Fonts CSS directly in the HTML (eliminating the round trips for fetching the CSS and improving overall page rendering performance).
- Proxies the font files through the same domain as the page, eliminating the round-trips to connect to Google's servers and allowing HTTP/2 priorities to work correctly.
The code also provides an example of how to do streaming HTML rewriting effectively in a Cloudflare Worker.
For testing purposes it also supports turning off the worker through query parameters added to the page URL:
cf-worker=bypassdisables all rewriting. i.e.https://www.example.com/?cf-worker=bypass
BSD 3-Clause licensed. See the LICENSE file for details.