function send$1 (req, path, options) {
  return new SendStream(req, path, options)
}
Set the location header to `url`.

The given `url` can also be "back", which redirects
to the _Referrer_ or _Referer_ headers or "/".

Examples:

   res.location('/foo/bar').;
   res.location('http://example.com');
   res.location('../login');

@param {String} url
@return {ServerResponse} for chaining
@public