+`seamless` is a TCP proxy that allow you to deploy new code then switch traffic
+to new backend without downtime.
+Switching backends is done with HTTP interface with the following API:
+ switch traffic to new backend
+ return (in plain text) current server
+* Start first backend at port 4444
+ seamless 8080 localhost:4444
+* Direct all traffic to port 8080 on local machine.
+When you need to upgrade the backend, start a new one (with new code on a
+different port, say 4445). Then::
+ curl http://localhost:6777/switch?backend=localhost:4445.
+Miki Tebeka <email@example.com>