> There are at least three places where you can get injected, one is from the ISP
I'm not sure if they still do it, but Vodafone in my country (and many others) used to cache and compress photos on all websites, which often led to visible degradation in image quality. Luckily I discovered that their software respected the `Cache-Control: no-transform` header so include that header on all my websites now.
I'm not sure if they still do it, but Vodafone in my country (and many others) used to cache and compress photos on all websites, which often led to visible degradation in image quality. Luckily I discovered that their software respected the `Cache-Control: no-transform` header so include that header on all my websites now.