Comment by bythreads

Fun fact: Turning off permessage deflate is nearly impossible when browsers are in the mix, best Option is to strip the header in a reverse proxy, since many browsers ignore the setting and emits the header despite your configs - add to that that most SERVERs assume the client knows what it is doing and adhere to the header request while not allowing a global override to turn it off.

gives you a fun ball of yarn to untangle