This gets a lot easier if you use the request library.

var request = require('request');

request.post(

'http://www.abcsite.com/formpage',

{ form: { key: 'value' } },

function (error, response, body) {

if (!error && response.statusCode == 200) {

console.log(body)

}

}

);

Aside from providing a nice syntax it makes json requests easy, handles oauth signing (for twitter, etc.), can do multi-part forms (e.g. for uploading files) and streaming.