upload.js

function upload_file(file) {
    var fd = new FormData
      , self = this

    fd.append('file', file)

    var xhr = request.post(url, {}, fd, function(err, response, headers) {
      if(err) {
        // non 200 resonse will be an error
        // handle error
      }

      //response should be an object constructed from a json response
      //headers will be response headers
    })
    //remove timeout
    xhr.timeout = 0
  }