code: public Map<String, String> getQueryStringParams() {
  		try {
  			Map<String, String> params = new HashMap<String, String>();
  			String queryString = new URL(url).getQuery();
  
  			params.putAll(URLUtils.queryStringToMap(queryString));
  			params.putAll(this.querystringParams);
  
  			return params;
  		} catch (MalformedURLException mue) {
  			throw new OAuthException("Malformed URL", mue);
  		}
  	}
docs: Get a {@link Map} of the query string parameters.
  
  @return a map containing the query string parameters
  @throws OAuthException if the URL is not valid