Austin, TX
2025-10-29
Researchers and practitioners have been studying connections almost as long as the Internet that supports them. Today, Cloudflare’s global network receives millions of connections per second. We explore various characteristics of TCP connections, including lifetimes, sizes, and more....
2025-09-24
After a year since we started enabling Automatic SSL/TLS, we want to talk about these results, why they matter, and how we’re preparing for the next leap in Internet security....
2025-03-20
We are closing the cleartext HTTP ports entirely for Cloudflare API traffic. This prevents the risk of clients unintentionally leaking their secret API keys in cleartext during the initial request. ...
2024-11-08
We describe how Cloudflare uses a custom Lisp-like programming language and formal verifier (written in Racket and Rosette) to prevent logical contradictions in our authoritative DNS nameserver’s behavior....
2024-09-25
Speed Brain uses the Speculation Rules API to prefetch content for the user's likely next navigations. The goal is to download a web page to the browser before a user navigates to it. ...
2024-08-08
This new Automatic SSL/TLS setting will maximize and simplify the encryption modes Cloudflare uses to communicate with origin servers by using the SSL/TLS Recommender....
2023-09-29
Starting today, you can secure the connection between Cloudflare and your origin server with post-quantum cryptography...
2023-09-04
In this blog we’re going to take a closer look at “connection coalescing”, with specific focus on manage it at a large scale...
2022-10-03
Today we’re excited to announce that we will soon be offering a zero-configuration option for security on Cloudflare. If we find that we can automatically upgrade the security connection between Cloudflare and a user’s origin, we will...
2021-10-13
Real world experiments for evaluating connection coalescing effects....
2021-10-12
Introducing customized recommendations to improve the security of your website....
