How to pass the CSRF token between rails applications

Our rails3 application talks to another rails application exposed as REST functions. We get the following warning post migration to rails3 on all POST calls made to the REST services.

WARNING: Can't verify CSRF token authenticity

How should we pass the csrf token on the wire when we make a POST call to the REST services, the ApplicationController has protect_from_forgery method and the call also lands on the handle_unverified_request call. We use HTTP basic auth to authenticate and it seems to work fine. What should we do to resolve this issue.