SEO is a murky science, with search engines striving to present the best possible result, and everyone else trying to figure out what "best" means in practice. What we do know is that…

Fastly Fiddle allows for instant experimentation with Fastly's edge cloud behaviours without having to set up a Fastly account. Now, we're adding the ability to define assertions to specify…

With attackers using publicly available lists of compromised passwords in an attempt to steal accounts, proof of work is a good way to slow the attackers down.

Over almost 30 years of its life, the web has grown beyond anyone's imagination, and the platform has become immensely powerful and flexible. With that power and flexibility comes complexity…

Quickly experiment, debug and try out ideas on Fastly's platform, without signing up, or even logging in.

Identity is a boring, but necessary element of most website builds. Validating a user’s identity and access rights is something that is in the critical performance path, required site-wide…

Websites still load too slowly. During the most critical time in the page load lifecycle, your connection is often almost totally idle. At Fastly, we’re watching a new technology that…

Manipulating HTTP headers is one of the most common things that Fastly customers do. Using the right combination of headers is one of the best things you can do for the security of your…

HTTP headers are an important way of controlling how caches and browsers process your web content. But many are used incorrectly or pointlessly, which adds overhead at a critical time in the…

Learn how to clear a cache memory with JavaScript to fix errors and improve front end performance.

Browsers need to understand and respond to Vary rules, and the way they do this is different from the way Vary is treated by CDNs. In this post, Principal Developer Advocate Andrew Betts…

Requesting the difference between two previously cached files — using just a CDN configuration and a serverless cloud compute function — is a great example of exploiting edge and serverless…