}
            }
            return null;
        }
    }

    /**
     * Ensures that expressions referring to URLs evaluate to normalized URLs.
     *
     */
    static class UrlNormalizingPostProcessor implements InterpolationPostProcessor {

        private static final Set<String> URL_EXPRESSIONS;

   * <p>Instances of {@code exceptionClass} are created by choosing an arbitrary public constructor
   * that accepts zero or more arguments, all of type {@code String} or {@code Throwable}
   * (preferring constructors with at least one {@code String}, then preferring constructors with at
   * least one {@code Throwable}) and calling the constructor via reflection. If the exception did