How to allow request robots.txt in GlassFish 3 for my app

Hello,please help me to find solution .
I have app that has controller on */robots.txt requests
but my app cannot get this request through GlassFish and server return 404.
I don't want return on request stable file, I want generate it in my app, what changes I need to do with GlassFish setting, domain.xml configuring ?
Also I have app request controller */sitemap.xml and without any changes in settings I got generated file from my app, so this situation only for robots.txt file !