to request an image, use the url api.yiff.download followed
by query parameters. the first parameter should be the
category (for example, femboy). by default, images are sfw.
to request nsfw images, add sfw=no.
to request a gif, include the gif parameter. for example:
api.yiff.download/?femboy&sfw=no&gif
to convert an image to a different format, add format and
quality parameters. supported formats are jpeg (or jpg),
png, webp, and gif (gif isn't available for normal images).
for example: