GZip Compression for Website with Ajax

Hi everyone,
i would like to enable gzip-compression for my website.
But than i have a problem with my ajax-requests.
E.g i run into js error (because i get a compressed json).
I guess i cant handle this with jQuery, so is it possible to disable the gzip compression for some controller-functions?

Eg. Controller/func1 = compression on
      Controller/func2 = compression off

Thank you ! 

//Im not sure if "Best Practices" or "General Help" is the correct section for this.