Check out the complete language docs. Here are some examples to get you started:

get:/	Get path /
get:/:b@100	100 random bytes as the body
get:/:h"User-Agent"="';drop table browsers;"	Add a User-Agent header
get:/:b@100:dr	Drop the connection randomly
get:/:b@100,ascii:ir,@1	100 ASCII bytes as the body, and randomly inject a random byte