code: function parseRes (res, cb) {
      var body = '';
      if ('setEncoding' in res) res.setEncoding('utf-8');
  
      res.on('data', function (data) {
          body += data;
          if (body.length > 1e10) {
              // FLOOD ATTACK OR FAULTY CLIENT, NUKE REQ
              res.connection.destroy();
              res.writeHead(413, {'Content-Type': 'text/plain'});
              res.end('req body too large');
              return cb(new Error('body overflow'));
          }
      });
  
      res.on('end', function () {
          cb(null, body);
      });
  
  }
docs: response parse helper fn