docs: function parseBase64Stream(req) {
    var passthrough = false;
    var accumulation = '';
    var stream = req.pipe(through(function(chunk, enc, callback) {
      if (!passthrough) {
        accumulation += chunk;
        var test = ';base64,';
        var index = accumulation.indexOf(test);
        if (index > -1) {
          passthrough = true;
          chunk = accumulation.substr(index + test.length);
        }
      }
      if (passthrough) {
        this.push(chunk);
      }
      callback();
    }))
      .pipe(base64.decode());
    return stream;
  }