This is not something you can just “turn off”, and unless you’re using an ancient browser version on an ancient device/operating system, there’s probably a problem with your server configuration, most likely the web server or reverse proxy configuration. So you need to find the root cause of the issue and fix it.
I suggest you either fill out the support template and additionally tell us in which browsers and on which devices the error occurs, or paste the error message into the search engine of your choice and into the search box of this forum.