gistfile1.js

var http = require('http'),
    qs = require('querystring');

var body = qs.stringify({ method: 'system.connect' });
var options = {
 host: 'www.goworkit.com',
 port: 80,
 path: '/services/json/',
 method: 'POST',
 headers: {
  'Content-Type': 'application/x-www-form-urlencoded',
  'Content-Length': body.length,
  'Accept': '*/*'
 }
};

var req = http.request(options, function(res) {
 console.log('STATUS: ' + res.statusCode);
 console.log('HEADERS: ' + JSON.stringify(res.headers));
 res.setEncoding('utf8');
 res.on('data', function(chunk) {
   console.log('BODY: ' + chunk);
 });
});

req.on('error', function(e) {
 console.log('problem with request: ' + e.message);
});

// write data to request body
req.end(body);

// write data to request body
req.end(body);

I think you mean write data to response body.

end takes an optional argument which is something to write before ending.
http://nodejs.org/docs/v0.4.9/api/http.html#request.end

Also, I'm writing to the request body, not the response body, because this is an HTTP client not an HTTP server.

Also, thanks for proofreading all of my gists. :)