Varnish + Rails causes invalid authenticity tokens in development

Question

Here is my situation. I am testing out Varnish on my local box (I'm doing some stuff related to page caching that would be a big pain to push to staging every time). Everything works fine, except whenever I submit a form, I get an ActionController::InvalidAuthenticityToken exception.

Varnish is running on localhost at port 6081, and Thin is running on localhost at port 80. I get the exception when I try to use the site using port 6081.

Is there any way I can get around this?

Answer 1

Okay, so the reason this was failing was my VCL file was clearing out all cookies on every request. Obviously, this would cause some issues with the authenticity token.

Silly fix for a silly problem :/