Posts by John Graham-Cumming

Evenly Distributed Future

Published on by John Graham-Cumming.

Traveling back and forth between the UK and US I often find myself answering the question “What does CloudFlare do?”. That question gets posed by USCIS on arrival and I’ve honed a short and accurate answer: “CloudFlare protects web sites from hackers, makes web sites faster and ensures they

The Cuban CDN

Published on by John Graham-Cumming.

On a recent trip to Cuba I brought with me a smartphone and hoped to get Internet access either via WiFi or 3G. I managed that (at a price) but also saw for myself how Cubans get access to an alternate Internet delivered by sneakernet. Cuba is currently poorly served

The Sleepy User Agent

Published on by John Graham-Cumming.

From time to time a customer writes in and asks about certain requests that have been blocked by the CloudFlare WAF. Recently, a customer couldn’t understand why it appeared that some simple GET requests for their homepage were listed as blocked in WAF analytics. A sample request looked liked

Using HTTP/2 Server Push with PHP

Published on by John Graham-Cumming.

Two weeks ago CloudFlare announced that it was supporting HTTP/2 Server Push for all our customers. By simply adding a Link header to an HTTP response specifying preload CloudFlare would automatically push items to web browsers that support Server Push. To illustrate how easy this is I create a