I'm in financial services...as part of our checkout process, the customer downloads a 1 MB pdf with sensitive and unique data to them. In testing ( a test site with cloudflare set up), everything was fine. In production, apparently cloudflare cached these pdfs after some sort of traffic threshold was reached (I guess they are all very similar in size...though they are probably not exactly the same size.) Now customers are calling that they are getting other people's data! Apparently cloudflare caches files without even comparing hashes of the download first. Needless to say, we entirely shut off any and all caching after that.