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I'm currently using cloudflare for a heavy loaded site and I need a second server.
cloudflare supports load balancing, but does not support sticky sessions.
Any suggestions what to use instead?
A load balancer behind CloudFlare maybe?
tsdns.io - free, redundant, DDoS-protected TSDNS
If your users are spread over different regions, you could send different locations to different servers.
Discounts on travel and tech subscriptions
you could use redis for sessions