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Engineering

December 10

CVE-2021-44228 is a Remote Code Execution vulnerability in the Apache Log4j library being actively exploited. We provide our observations into the exploit and a summary of its impact.

December 9

The web’s infrastructure — and the applications we build on it — must constantly evolve to meet the ever-transforming expectations of modern and future end users. We’ve gathered five lessons…

December 7

In this post, we’ll show how you can use information from an origin response to add an abuse IP address to our penalty box. We've been touting the promise of security at the edge, and this…

November 23

Many websites today are really applications, and we should be building them as such. To do that, we need application architectures and networks that are capable of supporting fast, secure…

November 17

As we look back to celebrate the 30th anniversary of the website, it’s also worth thinking about the next 30 years. There are a couple of areas where we — as engineers, developers, and…

November 8

Fastly customers have been using our Fiddle tool for years to try out ideas for edge logic in VCL. With the advent of Compute@Edge last year, we made our edge compute network accessible to…

November 2

In this tutorial, we’ll walk you through the basic steps of outputting messages to STDIO and tailing that output with the Fastly CLI as well as configuring a log streaming endpoint, emitting…

October 18

Our Security Research Team provides guidance on how to address CVE-2021-40438, a vulnerability in Apache HTTP Server version 2.4.48 and earlier, by patching impacted version(s) and enabling…

August 30

Curl, or cURL, is a utility that’s shipped by default on operating systems like MacOS and many Linux distributions that allows you to send an HTTP request to a URL and receive the result. In…

July 29

With JavaScript now available for WebAssembly and Compute@Edge, you can get started faster than ever with a language you already know, while ensuring the speed and security you need in a…

July 6

As you start to build more at the edge, it becomes ever more important to deploy edge logic in the same way you deploy changes to your own applications and infrastructure. Today, we’ll take…

June 21

In this post, we show how to test site speed modifications before implementing them using Compute@Edge and WebPageTest, a web performance tool that uses real browsers, to compare web…