Overall Satisfaction with Fastly
Fastly is a fantastic CDN / proxy layer for any web application. It’s built on Varnish, which offers a way to customize the caching and delivery of the web content to the end user with maximum flexibility, but without incurring a performance penalty. This is due to Varnish Configuration Language (VCL) being a compiled language.
- You can put your site behind Fastly and then selectively cache only some of the endpoints. You can modify the responses returned by stripping cookies or other personalization headers.
- You can deliver images, and based on the user agent being Chrome, decide to serve, for example, a WEBP image format instead of PNG or JPG.
- Not sure
- While I was at Wanelo we were able to put Fastly in front of the growing web app, and selectively cache end points to improve stability and performance. In the meantime we rewrote the app completely in Ruby. We wouldn’t have been able to do that without Fastly.
It’s the fastest and most configurable.