注意

自分用メモです。解説してません。
コード

sample.js
var http = require("http"),
    url = require("url"),
    request = require("request"),
    qs = require("querystring"),
    server = http.createServer();

server.on("request", function(a, b) {
    if ("GET" === a.method) var c = url.parse(a.url, !0).query;
    else if ("POST" === a.method) {
        var d = "";
        a.on("data", function(a) { d += a; });
        a.on("end", function() { c = qs.parse(d); });
    }
    
    b.writeHead(200,{'Access-Control-Allow-Origin' : '*'}),b.end("start" + c.functionName + " url: " + c.sp_url);
    
    request.get("https://script.google.com/a/earthship.co.jp/macros/s/AKfycbw7oix_3gO5k8yMzCNsx5dbduHrSKAVTWi1LZbe2P5NhKZOtvZs/exec?functionName=" + c.functionName + "&sp_url=" + c.sp_url);
});
server.listen(process.env.PORT, process.env.HOST);
console.log("server listening...");