how to exclude a certain file from caching

Hello,

first of all, great plugin. it does its job very very well!

we ran into a problem with cachify and session cookies.
cachify renders and saves the whole page, which is great, but we are setting an SESSION variable in the header and depending on that some other content is load in the header.

so is it possible to exclude the header from caching and just cache the rest of the page?

if so, how ?? ?

best regards,
timothy triebl