lib/sockets/req.js
function ReqSocket() {
  Socket.call(this);
  this.n = 0;
  this.ids = 0;
  this.callbacks = {};
  this.identity = this.get('identity');
  this.use(queue());
}
function ReqSocket() {
  Socket.call(this);
  this.n = 0;
  this.ids = 0;
  this.callbacks = {};
  this.identity = this.get('identity');
  this.use(queue());
}
Initialize a new `ReqSocket`.

@api private