Lua is a perfect scripting language for quick and lightweight logic - for proxies, middleware applications, and application level routing.
I wrote this small lua script as a test for redirecting one domain host to another:
json = require("json")
testString = [[ { "example.com": "example.org" } ]]
o = json.decode(testString)
table.foreach(o,print)
myhost = lighty.request["Host"]
if (o[myhost]) then
lighty.header["Location"] = "http://www." .. o[myhost]
return 301
end