Garnish is an example of a simple varnish implementation which should demonstrate.
It supports only Cache-Control header and keeps all the data in memory. It means that after restart of the application all data will disappear.
The project was described in more details in the article.
run tests using command-line (you need first cd to the garnish_SCION/garnish/): go test -v garnish_test.go
In the server side, run go run main.go -listen 127.0.0.1:1234
In the client side, run go run main.go -remote 18-ffaa:1:fc1,[127.0.0.1]:1234
18-ffaa:1:fc1 is the server's AS number.
If you want to select path, add -i to the client's command line;
If you have path selection preference, add -p latency|bandwidth|hops|mtu