imgproxy supports GIF output only when using libvips 8.7.0+ compiled with ImageMagick support. Official imgproxy Docker image supports GIF out of the box.
imgproxy supports ICO output only when using libvips 8.7.0+ compiled with ImageMagick support. Official imgproxy Docker image supports ICO out of the box.
Since processing of animated images is pretty heavy, only one frame is processed by default. You can increase the maximum of animation frames to process with the following variable: