What is redirect options?
You are offered several redirect options when you are working on your Domain Settings:
Short links contain 6 random characters: https://domai.in/a1b2c3
Short links contain 12 random characters.
Destination URL does not see original referer, it sees only short URL as a referer.
Short URL displays content of the long URL without redirecting. Shortened https://doma.in/a1b2c3 form of the domain remains on the browser.