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Engineering

July 13

State at the edge

With the introduction of Compute@Edge, Fastly provides a richer model for the CPU. WebAssembly, powered and secured by the Lucet compiler and runtime, unlocks essentially arbitrary code execution within each request lifecycle. This raises the…

July 6

Cache-Control in the wild

The Cache-Control response header is one of HTTP’s more widely known header fields; it allows a site to control how caches handle their data in CDNs, browsers, and elsewhere. This post digs into how it’s…

June 26

Improving HTTP with structured header fields

The HTTP community has been busy modernizing the web’s protocol over the last decade, with multiple revisions of the core specification, a number of extensions, HTTP/2, and now HTTP/3. Unfortunately, the way we define and…

June 10

Prevent application and network instability by serving stale content

Serving stale content not only lets you deliver the content users want more often, but also deliver predictable, professional, and helpful error content when origin servers cannot be reached.

March 27

Supercharging Server Timing with HTTP trailers

Server Timing is a great mechanism for collecting new performance metrics in the browser. Fastly and Firefox have teamed up to make them even more powerful by adding support for using Server Timing with HTTP…

February 7

Memory management in WebAssembly: guide for C and Rust programmers

Recently we launched Fastly Terrarium, a multi-language, browser-based editor and deployment platform where you can experiment with edge technology. Now, for those well-versed in C and Rust, we’ll explore WebAssembly memory management and implementation.

December 12

Edge programming with Rust and WebAssembly

Take a developer deep dive into Terrarium, our multi-language, browser-based editor and deployment platform at the edge. Learn how to compile Rust programs to WebAssembly right on your local machine, interact with the Terrarium system,…

December 10

How Terrarium reframes the compiler and sandbox relationship

Get hands-on with Terrarium, a Fastly project that lets developers harness the power of edge computing in the languages they already use. See how this technology demonstration came to be (and why we’re even using…

August 14

Fastly's Response to SegmentSmack

A remotely exploitable denial-of-service (DoS) attack against the Linux kernel, called SegmentSmack, was made public on August 6th, 2018 as CVE-2018-5390. Fastly was made aware of this vulnerability prior to that date through a responsible…

March 8

Building the WAF test harness

To help our customers secure their sites and applications — while continuing to give their users reliable online experiences — we’ve built a performant, highly configurable, and comprehensive Web Application Firewall (WAF). In order to…

January 3

The evolution of Fastly’s Open Source and Nonprofit Program: supporting an ethical and open internet

Open source projects are the foundation of the internet; by sponsoring their important work, we support our vision for unfettered, scalable technical innovation. We’ve supported numerous open source projects since the inception of Fastly, and…

October 19

The QA mindset: designing for reliability

Fastly’s engineering teams are smart and capable — they architect thoughtfully, write elegant code, and work carefully with incredible complexity and scale. So why would they (or anyone) need quality assurance (QA)? In this post,…

October 11

Building the Fastly WAF

In keeping with our security team’s vision for defending the modern web, we launched our Web Application Firewall (WAF) to help our customers secure their sites and applications while providing reliable online experiences for their…

October 6

Deliberate practice in information security

Deliberate practice is the act of performing a set of tasks that are just slightly more difficult than what you’re used to, so you can get better at a specific activity and move from a…

July 6

How we moved our Historical Stats from MySQL to Bigtable with zero downtime

In an effort to move forward from early architecture that we were quickly outgrowing, we recently migrated our Historical Stats database from self-managed MySQL to Google Cloud Bigtable. Read on to learn how we did…

May 24

New York Media on surviving DDoS and building a better web

At Altitude 2016, New York Media’s CTO discussed surviving a massive DDoS and the steps they took to mitigate, gave us a peek inside their stack, and described how New York Media is building a…

May 16

The New York Times on failure, risk, and prepping for the 2016 US presidential election

At Altitude NYC, The New York Times CTO Nick Rockwell gave us a peek inside The New York Times’ stack and culture (and how he’s redefined risk from both a corporate and engineering standpoint), and…

March 14

Creating originless & cloud-based services with Fastly + Terraform

In a previous post, HashiCorp’s Seth Vargo introduced the Terraform infrastructure-as-code tool for building, changing, and versioning infrastructure. In this post, we’ll cover two cases using Terraform with Fastly: first we’ll create and manage an…

January 19

Google Chrome’s Alex Russell on service workers, PWAs, and what’s next for mobile

At Altitude 2016, Software Engineer Alex Russell discussed the latest projects the “performance obsessed” Google Chrome team had underway. In this recap, we’ll take a look at how you can provide reliable offline experiences, how…

December 8

Building and scaling the Fastly network, part 2: balancing requests

In part 1, we discussed how Fastly started down the slippery slope of network software. Our previous experience with routing suggested that avoiding traditional network devices would not only dramatically cut capital expenditure, but…