code: function(data) {
        var self = this
        this.data = data
        this.readyState = 4
        if (this.method == 'HEAD') this.responseText = null
        this.responseHeaders['content-length'] = (this.responseText || '').length
        if(this.async) this.onreadystatechange()
        lastRequest = function(){
          return self
        }
      }
docs: Send request _data_.