docs: private static Map<String, String> createParameterMap(String queryString) {
          if ((queryString == null) || queryString.isEmpty()) {
              return null;
          }
  
          final String[] pairs = queryString.split("&");
          final Map<String, String> params = new LinkedHashMap<>(pairs.length);
  
          for (final String pair : pairs) {
              if (pair.isEmpty()) {
                  continue;
              }
  
              String[] tokens = pair.split("=", 2);
              switch (tokens.length) {
                  case 1:
                      if (pair.charAt(0) == '=') {
                          params.put("", tokens[0]);
                      } else {
                          params.put(tokens[0], "");
                      }
                      break;
                  case 2:
                      params.put(tokens[0], tokens[1]);
                      break;
              }
          }
          return new LinkedHashMap<>(params);
      }