Connecting to Google App Engine

For headers I was thinking outgoing requests

Looks like you can do that too, just like node.js - not that I remember implementing it :)

Untested, but:

var options = {
      host: 'hybrisiot.appspot.com', 
      port: '80',
      path:'/shelves/default/status/' + getButtonStatus(), 
      method:'post',
      headers: { "A":"B", "C":"D"} // <----------------- Here
    };
    var req = require("http").request(options, function(res) { ... });