Varnish and Symfony2

[Miguel González Castaños]

Dear all,

   I'm new to Varnish so bear my naive questions. We have a LAMP server 
running a Symfony2 application. I have just configured a very basic 
configuration just pointing to the Apache backend at 8000 port. I've 
realized that some content of the front page is not displayed (javascript).

   How can I check why is that content not displayed?

   Just to let you know, we have cache enabled on Symfony too.

   Regards,

   Miguel