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Re:Building Your Own CDN for Fun and Profit by forcer on Wednesday February 14, 2018 @10:01AM (#16376172)
Author mentions why not use Cloudflare that CDN cache is purged often. If you want to verify if it happens for your content. You can try this tool - http://cloudperf.speedchecker.xyz/cloudflare-tester.html

Side effect of this tool as you might have guessed is that using it will actually prolong the time your content stays in their cache.

Re:Building Your Own CDN for Fun and Profit by kardos on Wednesday February 14, 2018 @12:13PM (#16377335)
So one could setup an automated crawler thatbruns frequently to keep everything in cache?
Re:Building Your Own CDN for Fun and Profit by janoszen on Wednesday February 14, 2018 @12:26PM (#16377449)
Yes, but you would need a crawler that does so in every region, or at least know the IPs of the edge nodes on that CDN. You would probably also hit some rate limit / DDoS protection with the CDN itself.