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Rust

July 27, 2026
We’re open-sourcing our privacy proxy CLI

pvcli is a curl-like tool designed to simplify the testing of complex privacy protocols like OHTTP.

Hannah Wang,Ben Yang, and Fisher Darling

May 12, 2026
When "idle" isn't idle: how a Linux kernel optimization became a QUIC bug

We investigated a bug where CUBIC's congestion window became pinned at its minimum floor, causing a performance to plummet. The fix involved correctly measuring idle periods to distinguish RTT wait times from actual application idleness.

Esteban Carisimo and Antonio Vicente

April 22, 2026
Making Rust Workers reliable: panic and abort recovery in wasm‑bindgen

Panics in Rust Workers were historically fatal, poisoning the entire instance. By collaborating upstream on the wasm‑bindgen project, Rust Workers now support resilient critical error recovery, including panic unwinding using WebAssembly Exception Handling.

Guy Bedford,Hood Chatham, and Logan Gatlin

April 17, 2026
Agents Week: network performance update

By migrating our request handling layer to a Rust-based architecture called FL2, Cloudflare has increased its performance lead to 60% of the world’s top networks. We use real-user measurements and connection trimeans to ensure our data reflects the actual experience of people on the Internet.

Lai Yi Ohlsen

March 23, 2026
Launching Cloudflare’s Gen 13 servers: trading cache for cores for 2x edge compute performance

Cloudflare’s Gen 13 servers double our compute throughput by rethinking the balance between cache and cores. Moving to high-core-count AMD EPYC ™ Turin CPUs, we traded large L3 cache for raw compute density. By running our new Rust-based FL2 stack, we completely mitigated the latency penalty to unlock twice the performance.

Syona Sarma,JQ Lau, and Jesse Brandeburg

February 13, 2026
Shedding old code with ecdysis: graceful restarts for Rust services at Cloudflare

ecdysis is a Rust library enabling zero-downtime upgrades for network services. After five years protecting millions of connections at Cloudflare, it’s now open source.

Manuel Olguín Muñoz

January 27, 2026
Building a serverless, post-quantum Matrix homeserver

As a proof of concept, we built a Matrix homeserver to Cloudflare Workers — delivering encrypted messaging at the edge with automatic post-quantum cryptography.

Nick Kuntz

December 18, 2025
Announcing support for GROUP BY, SUM, and other aggregation queries in R2 SQL

Cloudflare’s R2 SQL, a distributed query engine, now supports aggregations. Explore how we built distributed GROUP BY execution, using scatter-gather and shuffling strategies to run analytics directly over your R2 Data Catalog.

Jérôme Schneider,Nikita Lapkov, and Marc Selwan

October 28, 2025
Keeping the Internet fast and secure: introducing Merkle Tree Certificates

Cloudflare is launching an experiment with Chrome to evaluate fast, scalable, and quantum-ready Merkle Tree Certificates, all without degrading performance or changing WebPKI trust relationships.

Luke Valenta,Christopher Patton,Vânia Gonçalves, and Bas Westerbaan

September 26, 2025
Cloudflare just got faster and more secure, powered by Rust

We’ve replaced the original core system in Cloudflare with a new modular Rust-based proxy, replacing NGINX.

Richard Boulton,Steve Goldsmith,Maurizio Abba, and Matthew Bullock

September 25, 2025
R2 SQL: a deep dive into our new distributed query engine

R2 SQL provides a built-in, serverless way to run ad-hoc analytic queries against your R2 Data Catalog. This post dives deep under the Iceberg into how we built this distributed engine.

Yevgen Safronov,Nikita Lapkov, and Jérôme Schneider

July 24, 2025
Serverless Statusphere: a walk through building serverless ATProto applications on Cloudflare’s Developer Platform

Build and deploy real-time, decentralized Authenticated Transfer Protocol (ATProto) apps on Cloudflare Workers.

Inanna Malick

April 11, 2025
A next-generation Certificate Transparency log built on Cloudflare Workers

Learn about recent developments in Certificate Transparency (CT), and how we built a next-generation CT log on top of Cloudflare's Developer Platform.

Luke Valenta

December 30, 2024
Open sourcing h3i: a command line tool and library for low-level HTTP/3 testing and debugging

h3i is a command line tool and Rust library designed for low-level testing and debugging of HTTP/3, which runs over QUIC.

Lucas Pardue and Evan Rittenhouse

October 25, 2024
Elephants in tunnels: how Hyperdrive connects to databases inside your VPC networks

Hyperdrive (Cloudflare’s globally distributed SQL connection pooler and cache) recently added support for directing database traffic from Workers across Cloudflare Tunnels.

Andrew Repp,Emilio Assunção, and Abhishek Chanda

September 10, 2024
A good day to trie-hard: saving compute 1% at a time

Pingora handles 35M+ requests per second, so saving a few microseconds per request can translate to thousands of dollars saved on computing costs. In this post, we share how we freed up over 500 CPU

Kevin Guthrie

August 22, 2024
Go wild: Wildcard support in Rules and a new open-source wildcard crate

We’re excited to announce wildcard support across our Ruleset Engine-based products and our open-source wildcard crate in Rust. Configuring rules has never been easier, with powerful pattern matching enabling simple and flexible URL redirects and beyond for users on all plans.

Nikita Cano and Diogo Sousa

July 25, 2024
Making WAF ML models go brrr: saving decades of processing time

In this post, we discuss performance optimizations we've implemented for our WAF ML product. We'll guide you through code examples, benchmarks, and we'll share the impressive latency reduction numbers

Alex Bocharov

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