def verify_page(context)
      return if context.url_match_attribute.nil?
      return if context.has_correct_url?
      raise Tapestry::Errors::PageURLFromFactoryNotVerified
    end
def verify_page(context)
      return if context.url_match_attribute.nil?
      return if context.has_correct_url?
      raise Tapestry::Errors::PageURLFromFactoryNotVerified
    end
This method is used to provide a means for checking if a page has been
 navigated to correctly as part of a context. This is useful because
 the context signature should remain highly readable, and checks for
 whether a given page has been reached would make the context definition
 look sloppy.