Unpkg, a content delivery network (CDN) that powers more than 4 billion requests per day, went down for several hours on Friday morning. The outage broke the thousands of websites that use the open-source CDN, leaving developers scrambling for a fix.
The outage appeared to have started around 4AM ET, with sites returning a 520 error from Cloudflare, which powers Unpkg. Many developers affected by the outage switched to jsDelivr, another open-source CDN for GitHub and the package manager npm, in order to keep their sites online. Unpkg started coming back online at around 9AM ET. That’s when Fly.io — the service that Unpkg’s origin server uses to provide auto-scaling infrastructure — announced that it “deployed a fix” to recover affected…