Both Cloudflare and Cloudfront (when used as a dynamic content CDN) offer persistent open connections to your origin, as a standard feature of their offering.

Both Cloudflare and Cloudfront (when used as a dynamic content CDN) offer persistent open connections to your origin, as a standard feature of their offering. https://blog.cloudflare.com/keep-alive/ https://blog.cloudflare.com/keep-alive/ https://support.cloudflare.com/hc/en-us/articles/200168346-Best-practices-for-Railgun-and-a-Load-Balancer https://support.cloudflare.com/hc/en-us/articles/200168346-B... https://aws.amazon.com/blogs/aws/amazon-cloudfront-support-for-dynamic-content/ https://aws.amazon.com/blogs/aws/amazon-cloudfront-support-f...