docs: function writeOut(code, res, out, headers, options) {
    // Set length if necessary
    if (!headers['Content-Length']) {
      headers['Content-Length'] = Buffer.byteLength(out);
    }
    if (code === 200) {
      for (var k in headers) {
        if (headers.hasOwnProperty(k)) {
          res.setHeader(k, headers[k]);
        }
      }
      res.end(out, options.encoding);
    } else {
      res.writeHead(code, headers);
      res.end();
    }
  }