def uri_with_signature
      separator = if request_parser.query_params? then '&' else '?' end
      encoded_signature = signature.extend(UriSigner::Helpers::String).escaped
      "%s%s_signature=%s" % [self.uri, separator, encoded_signature]
    end
def uri_with_signature
      separator = if request_parser.query_params? then '&' else '?' end
      encoded_signature = signature.extend(UriSigner::Helpers::String).escaped
      "%s%s_signature=%s" % [self.uri, separator, encoded_signature]
    end
Returns the URI with the signature appended to the query string

 return [String]