You want to try out multiple variations of a page or a feature of your website, dividing your users into groups, some of whom experience one version, and some the other. Once a person is in one group, they should continue to get a consistent experience.

You want to try out multiple variations of a page or a feature of your website, dividing your visitors into groups, some of whom experience one version, and some the other. Once a visitor is in one group, they should continue to get a consistent experience.

Your website includes JavaScript on the client side that generates analytics, and you want to collect this data, but want to avoid an uncacheable request reaching your servers for every page view. Fastly's real-time logging can help.

Use ratecounters and penalty boxes to stop high-volume automated attacks against your website.

Create a service to deliver your website through Fastly CDN in a few short steps.

Learn how to cache API responses at the Fastly edge using surrogate keys, improve performance, and purge cached data when it changes.

Use Fastly to give your users a better experience with edge computing.

You need to fetch data from external APIs and add extra headers with additional useful information to the origin

Your site is available only in certain regions, or offers content that varies between regions. Whether it's at the country level or down to the square kilometer, Fastly's geolocation data offers a way to group and route traffic in a regionally specific way.

Your infrastructure consists of one or more REST APIs and you want to expose a unified GraphQL endpoint to fetch and cache data for your next-generation applications.

Learn how to implement API cache control once you've enabled caching.

This is a step-by-step tutorial that shows you how to use the Fastly CDN with an example website and domain name.

This is a step-by-step tutorial that shows you how to use Compute, Fastly's serverless computing platform.

This is a step-by-step tutorial that shows you how to set up Fastly's Image Optimizer ("Fastly IO") for a real website. It builds on the concepts introduced in Introduction to Fastly's CDN, and it guides you through the steps of optimizing the images for Taco Labs, the static website we previously used as an example.

The popular JSON Web Token format is a useful way to maintain authentication state and synchronize it between client and server. You are using JWTs as part of your authentication process and you want to decode and validate the tokens at the edge, so that content can be cached efficiently for all authentication states.

The popular JSON Web Token format is a useful way to maintain authentication state and synchronize it between client and server. You are using JWTs as part of your authentication process and you want to decode and validate the tokens at the edge, so that content can be cached efficiently for all authentication states.

Learn how to store and retrieve key-value data at the edge by building a basic hit counter in a serverless Fastly Compute app.

Your images are the single largest contributor to page size. You want to display something that's lower resolution in place of the actual image that’s intended to be displayed, while waiting for the full-resolution image to be downloaded.

Pass requests to Fastly's Next-Gen Web Application Firewall (Next-Gen WAF) from Compute code and make decisions based on the analysis response.

Use Fastly Image Optimizer to deliver high performance images.

Share your website with the world without needing a host.

Your servers often have to handle millions of requests for old and non-canonical URLs. This can cause unneeded load, as well as make logs messier and, if you have recently changed your site's URL scheme, you might be redirecting a lot! Learn how to shift all your static redirects to the edge using a dictionary.

When your servers are down, or if they take a while to generate pages, end users should be able to benefit from being served cached content - even if it's slightly stale.

You need to fetch personalized data from external APIs and serve it to the user without a full web stack.

Learn how to curate discovered APIs into a living team reference that helps identify shadow APIs, track deprecated endpoints, and document your API landscape.

To help debug issues and monitor backend behavior, you can capture and log the origin server's name, IP, and port, ensuring visibility into where requests are routed, even when responses aren't cached.

You have regular large volumes of traffic and need to limit the rate at which users can start new sessions. Once a user has been allowed in, they should retain access.

This section describes the initial things you need to be familiar with when setting up the Fastly CDN for an example website.

Let's get started by creating a Fastly account and logging in to the Fastly web interface. We can sign up for a trial account — no credit card information is required.

In this section, we'll explore some of the edge features available to our Fastly service. We'll configure Fastly to serve synthetic responses to certain types of requests, enable compression of our assets, and configure a streaming logging endpoint so we can see who's visiting our website.

You have complete control over what content is cached, and for how long that content is cached.

We've done a lot of work to prepare our Fastly service for the Taco Labs website! Now it's time to put the finishing touches on things so we can go live and start using Fastly for our production website.

In this section, we’ll provide some tips and tricks for dealing with day-to-day website issues and headaches.

That’s a wrap! We’ve successfully started using Fastly to cache our static website.

IMPORTANT: This feature is only available to Next-Gen WAF customers with access to the Next-Gen WAF control panel . This tutorial guides…

Customers expect top-notch performance and interactivity from websites. Are your web applications up to the task? With Compute, Fastly's…

It's time to get started with Fastly's Compute platform. In this section, we'll walk through everything we need to start building and…

Recall that we created a static website called Taco Labs in Introduction to Fastly's CDN that we cached using a VCL service. In this…

Now that we've successfully chained our Compute service to our VCL service, we can start modifying our serverless application to add…

We've successfully started using the Compute platform to deliver our static website. At this point, you can visit https://compute.tacolabs…

Images are an important part of your website or application. To ensure that your images load quickly, you should optimize each image for…

Let's get started by picking up where we left off in Introduction to Fastly's CDN . At that end of that tutorial, we had a fully-functional…

There are two ways Fastly IO can interact with our images. The first is by using the default settings we specify in the Fastly web interface…

We've enabled Fastly IO, configured the default settings, and verified that Fastly IO is automatically transforming all of the images on our…

That's it! We've successfully enabled and configured Fastly IO for Taco Labs. Go ahead, visit https://io.tacolabs.com — or whatever domain…