You can use the Vary response header in creative ways, including A/B testing and internationalization. At the same time, many people still use Vary badly or misunderstand what it does; in…

Surrogate keys give Fastly customers a unique way to efficiently purge content from cache — batch API for surrogate key purge allows you to purge content even more efficiently by purging…

Since we made HTTP/2 generally available in November 2016, h2 traffic has been steadily growing as more customers migrate to the new version of the protocol; since the beginning of 2017, h…

Since a CDN is essentially a cache, you might be tempted to avoid complexity by not making use of the browser cache. However, each cache has its own advantages that the other does not…

One of the most common metrics for evaluating CDN performance is cache hit ratio (CHR). CDN customers have used it for years as a primary indicator of how well a CDN is serving their users…

Our CDN can cache more content than traditional solutions (static as well as rapidly changing, “event-driven” content), offloading traffic that would otherwise go to origin, allowing our…

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…

The Fastly API is an integral part of our CDN — using our APIs, customers are able to instantly reflect configuration changes, purge content, and perform anything that is available on the…

A/B testing is valuable, aggravating, and everyone has an opinion on the best way to do it. At Fastly, we provide a set of tools to help enable experiments you can integrate into your own…

HashiCorp’s Director of Technical Advocacy discusses Terraform, their tool for building, changing, and versioning infrastructure safely and efficiently, and how they use it to codify Fastly…

Often the main goal for marketing and advertising campaigns is to point visitors to your website, and it’s important you’re prepared for the success you’ll (hopefully) see. Hear how Fastly…