31
Two years of production Go at CloudFlare
Almost two years ago CloudFlare started working with Go. What started as an experiment on one network and concurrency heavy project has turned into full, production use of Go for multiple services.
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Visit blog.cloudflare.com → RSS feedOn Hacker News Jun 2011 – Nov 2026
Networking & Internet 106Security & Privacy 101Infrastructure & DevOps 77Web & Frontend 75Systems & Performance 64Software Engineering 53
32
A steam locomotive from 1993 broke my yarn test
Yarn tests fail consistently at the 27-second mark. The usual suspects are swiftly eliminated to no avail. A deep dive is taken to comb through traces, only to be derailed into an unexpected crash investigation.
33
Running Zig with WASI on Cloudflare Workers
After the recent announcement regarding WASI support in Workers I decided to see what it would take to get code written in Zig to run as a Worker, and it turned out to be pretty trivial. This post documents the process I followed
34
Fuzzing a DNS parser written in Go
Here at CloudFlare we are heavy users of the github.com/miekg/dns Go DNS library and we make sure to contribute to its development as much as possible. Therefore when Dmitry Vyukov published go-fuzz and started to uncover tens of bugs in the Go standard library, our task was clear.
35
Why does one Nginx worker take all the load?
Scaling up TCP servers is usually straightforward. Most deployments start by using a single process setup. When the need arises more worker processes are added.
36
We found a bug in the hyper HTTP library
By rearchitecting the Images binding, we accidentally uncovered a bug that existed in the open-source hyper library across multiple major versions.
37
eBPF Can't Count?
It is unlikely we can tell you anything new about the extended Berkeley Packet Filter, eBPF for short, if you've read all the great man pages, docs, guides, and some of our blogs out there. But we can tell you a war story, who doesn't like those?
38
Recycling memory buffers in Go
This blog post is very old now. You probably don't want to use the techniques described here. GO'S sync.Pool is a better way to go.
39
We just shipped support for the ugliest part of HTTP: Vary
Vary support is now available in Cache Rules on every plan. You can normalize known negotiation headers, pass exact values through to the origin when those small differences matter, or bypass cache when the variation is too unpredictable.
40
Setting Go variables from the outside
CloudFlare's DNS server, RRDNS, is written in Go and the DNS team used to generate a file called version.go in our Makefile. version.go looked something like this.
41
Orchestrating AI code review at scale
Learn about how we built a CI-native AI code reviewer using OpenCode that helps our engineers ship better, safer code.
42
Python Workers redux: fast cold starts, packages, and a uv-first workflow
Recent advancements in Cloudflare Python Workers means fast cold starts, comprehensive package support, and a great developer experience. We explain how they were achieved and show how Python can be used to build serverless applications on Cloudflare.
43
A Primer on Proxies
A technical dive into traditional TCP proxying over HTTP
44
You can now use WebGPU in Cloudflare Workers
Today, we are introducing WebGPU support to Cloudflare Workers. This blog will explain why it's important, why we did it, how you can use it, and what comes next
45
Go has a debugger and it's awesome
Something that often, uh... bugs Go developers is the lack of a proper debugger. Builds are ridiculously fast and easy, but sometimes it would be nice to just set a breakpoint and step through that endless if chain or print a bunch of values without recompiling ten times.
46
Io_submit and Linux AIO – An epoll alternative
The Linux AIO is designed for, well, Asynchronous disk IO! They are not network sockets, but is it possible to use Linux AIO API with network sockets? The answer is a strong YES!
47
Improving compression with a preset DEFLATE dictionary
A few years ago Google made a proposal for a new HTTP compression method, called SDCH (SanDwiCH). The idea behind the method is to create a dictionary of long strings that appear throughout many pages of the same domain (or popular search results).
48
Doubling the speed of jpegtran with SIMD
It is no secret that at CloudFlare we put a great effort into accelerating our customers' websites. One way to do it is to reduce the size of the images on the website. This is what our Polish product is for.
49
Compiling to Lua
We use nginx throughout our network for front-line web serving, proxying and traffic filtering. In some cases, we've augmented the core C code of nginx with our own modules, but recently we've made a major move to using Lua in conjunction with nginx. One project that's now almost entirely written in Lua is the new…
50
Golang at CloudFlare
The other day I blogged here about our new Railgun software that speeds up the back haul between CloudFlare data centers and our clients' servers. At CloudFlare we're using a number of different languages depending on the task.
51
SIDH in Go for quantum-resistant TLS 1.3
Most of today's cryptography is designed to be secure against an adversary with enormous amounts of computational power. This means estimating how much work certain computations require, and choosing cryptographic parameters based on our best estimates.
52
How Stacks Are Handled in Go
At CloudFlare, We use Go for a variety of services and applications. In this blog post, We're going to take a deep dive into some of the technical intricacies of Go.
53
Cloudflare Workers Announces Broad Language Support
Today, we’re excited to announce support for Python, Scala, Kotlin, Reason and Dart. You can build applications on Cloudflare Workers using your favorite language starting today.