ESI is a standard way to assemble pages. This spec is supported by several reverse proxies.
slideshare.net/joshbuddy/to-the-edge-of-web-performance-and-beyond
In your builder, just use it.
use EsiForRack
In your HTTP responses, just normal ESI tags. If you’re working within Rails, give Spackle a try.
Here is an example of a response that would be parsed by EsiForRack
<html>
<body>
<esi:include src="/helloworld"/>
</body>
</html>
In this case, a request to /helloworld would be made by EsiForRack to fill in the request. If your application sent: “Hey world” as a response to /helloworld the above example would be interpolated to:
<html>
<body>
Hey world
</body>
</html>