How to set HTTPOnly in cookie when HTTP::response & make the session persist on that cookie

I added following irule for enabling secure flag, but it ended up blocking access to website & I get page cannot be displayed !

when HTTP_RESPONSE { Check if the response contains the test cookie

if {[HTTP::cookie test_Cookie]}{

 Set the httponly & secure flag on the persistence cookie if it is in the response
 HTTP::cookie httponly test_Cookie enable
 HTTP::cookie secure test_Cookie enable
}

}

Any Ideas what could've caused this ?