Endpoints:

• /jxl/URL - force jxl
  • ?only=SIZE - limit download to SIZE
• /png/URL - force png
• /gif/URL - force gif
• /image.gif - force gif
• /auto.gif - auto (jxl/png/gif) with gif extension in url
• /URL - auto (jxl/png/gif)
• /auto?
  • jxl=optional jxl
  • jxlr=optional jxl redirect
  • avif=optional avif
  • avifr=optional avif redirect
  • fallback=optional manual fallback