HTTP/3: From root to tip
HTTP is the application protocol that powers the Web. It began life as the so-called HTTP/0.9 protocol in 1991, and by 1999 had evolved to HTTP/1.1, which was standardised within the IETF (Internet Engineering Task Force). HTTP/1.1 was good enough for a long time but the ever changing needs of the Web called for a better suited protocol, and HTTP/2 emerged in 2015. More recently it was announced t
Fast Google Fonts with Cloudflare Workers
Google Fonts is one of the most common third-party resources on the web, but carries with it significant user-facing performance issues. Cloudflare Workers running at the edge is a great solution for fixing these performance issues, without having to modify the publishing system for every site using Google Fonts. This post walks through the implementation details for how to fix the performance of
Optimizing HTTP/2 prioritization with BBR and tcp_notsent_lowat
Optimizing HTTP/2 prioritization with BBR and tcp_notsent_lowat2018-10-12 Getting the best end-user performance from HTTP/2 requires good support for resource prioritization. While most web servers support HTTP/2 prioritization, getting it to work well all the way to the browser requires a fair bit of coordination across the networking stack. This article will expose some of the interactions betwe
The Road to QUIC
QUIC (Quick UDP Internet Connections) is a new encrypted-by-default Internet transport protocol, that provides a number of improvements designed to accelerate HTTP traffic as well as make it more secure, with the intended goal of eventually replacing TCP and TLS on the web. In this blog post we are going to outline some of the key features of QUIC and how they benefit the web, and also some of the
Announcing 1.1.1.1: the fastest, privacy-first consumer DNS service
Announcing 1.1.1.1: the fastest, privacy-first consumer DNS service Loading... Cloudflare's mission is to help build a better Internet. We're excited today to take another step toward that mission with the launch of 1.1.1.1 — the Internet's fastest, privacy-first consumer DNS service. This post will talk a little about what that is and a lot about why we decided to do it. (If you're interested in
The Languages Which Almost Became CSS
This was adapted from a post which originally appeared on the Eager blog. Eager has now become the new Cloudflare Apps. In fact, it has been a constant source of delight for me over the past year to get to continually tell hordes (literally) of people who want to – strap yourselves in, here it comes – control what their documents look like in ways that would be trivial in TeX, Microsoft Word, and
Incident report on memory leak caused by Cloudflare parser bug
Incident report on memory leak caused by Cloudflare parser bug2017-02-23 Last Friday, Tavis Ormandy from Google’s Project Zero contacted Cloudflare to report a security problem with our edge servers. He was seeing corrupted web pages being returned by some HTTP requests run through Cloudflare. It turned out that in some unusual circumstances, which I’ll detail below, our edge servers were running
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SIDH in Go for quantum-resistant TLS 1.3
Going Global - a Localization Case Study at Cloudflare