code: public static String decryptToBase64Url(String encodeUrl) {
          encodeUrl = encryptToBase64Url(encodeUrl);
          if (encodeUrl.indexOf("*") != -1) {
              encodeUrl = encodeUrl.replaceAll("\\*", "\\+");
          }
          if (encodeUrl.indexOf("_") != -1) {
              encodeUrl = encodeUrl.replaceAll("_", "/");
          }
          return encodeUrl;
      }
docs: Base64解密 url变种