Some forum admins might be using a server that has the brotli module installed.

If so, gz compression option in Admin settings can be set to off.
Should there be a short note be added near the compression option advising to set it to off if using brotli - or maybe in the install doco?

This is a good question. According to the Google AI, we should be able to detect the Apache mod_brotli using function get_headers and a few lines of code. This can be a good feature for v1.12

Quote: Originally posted by miqrogroove

This is a good question. According to the Google AI, we should be able to detect the Apache mod_brotli using function get_headers and a few lines of code. This can be a good feature for v1.12

Better implementation. ☝️

Should I put it into the bug tracker as a feature request?

You may, yes. Based on what I've read about brotli, it might only be useful in case of compressed cache storage. For dynamic content like XMB, it takes longer to run brotli than it does to transmit the original data.