hello! the problem is that about 2 months ago, the iphone browser sent such formats as webp/avif in http accept headers. a normal header should look like "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,/;q=0.8". on iphone now it looks like "text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8"