code: function parseUrl(url) {
  	  if (typeof url !== 'string') return {};
  	  var match = url.match(/^(([^:\/?#]+):)?(\/\/([^\/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?$/); // coerce to undefined values to empty string so we don't get 'undefined'
  
  	  var query = match[6] || '';
  	  var fragment = match[8] || '';
  	  return {
  	    protocol: match[2],
  	    host: match[4],
  	    path: match[5],
  	    relative: match[5] + query + fragment // everything minus origin
  
  	  };
  	}
docs: borrowed from https://tools.ietf.org/html/rfc3986#appendix-B intentionally using regex and not <a/> href parsing trick because React Native and other environments where DOM might not be available