JSDelivr

About JSDelivr

Being the second most popular public CDN it hosts a vast variety of projects. Due to its use of two DNS providers even when one of them stops working the other can keep the CDN online. All the served files of JSDelivr are cached at the origin servers on the SSD disks. Its permanent cache is hosted by Amazon S3 where it gets its locally un-cached files. Following the initial step of retrieving the files all of them get permanently cached on S3.