I have a question about the "XSRF" protection.  I've implemented this
by using a requestFilter which filters for the "nocache.js" file and
sets a "sid" cookie with the session id as the value.  Then for each
RPC call I send the value of the "sid" cookie as a get parameter.
When the session is active this works great.  The issue I have is when
the session expires, or invalid for some reason.  Currently this is
reporting a false "XSRF" attack since the sid no longer matches the
session id on the server.

If the sid is based off the session Id (or anything that changes over
time), how might it get updated when the session id gets invalidated?

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