code: public static void contextPath(String context) {
          if (S.blank(context)) ctx = "";
          else {
              E.illegalArgumentIf(!context.startsWith("/"), "context path should start with \"/\"");
              if (context.endsWith("/")) {
                  ctx = S.str(context).beforeLast("/").toString();
              }
          }
      }
docs: Set url context path. It's either an empty string, or a path
  starts with "/" but not end with ""
  
  @param context the context path to be configured