[kentonv]

The config format is defined and documented here:

https://github.com/cloudflare/workerd/blob/main/src/workerd/...

We definitely need to provide more higher-level documentation around this, which we're working on, but if you're patient enough to read the schemas then everything is there. :)

To act as a proxy, you would define an inbound socket that points to a service of type `ExternalServer`. There are config features that let you specify that you want to use proxy protocol (where the HTTP request line is a full URL) vs. host protocol (where it's just a path, and there's a separate Host header), corresponding to forward and reverse proxies.

Next you'll probably want to add some Worker logic between the inbound and outbound. For this you'd define a second service, of type `Worker`, which defines a binding pointing to the `ExternalServer` service. The Worker can thus send requests to the ExternalServer. Then you have your incoming socket deliver requests to the Worker. Voila, Workers-based programmable proxy.

Again, I know we definitely need to write up a lot more high-level documentation and tutorials on all this. That will come soon...