When you post a link from Stack Exchange into the chatbox using HTTPS, the link does not onebox. However, if you change the link to HTTP, it works. See the screenshot below:
HTTPS URLs should onebox, too.
Meta Stack Exchange is a question and answer site for meta-discussion of the Stack Exchange family of Q&A websites. It only takes a minute to sign up.
Sign up to join this communityWhen you post a link from Stack Exchange into the chatbox using HTTPS, the link does not onebox. However, if you change the link to HTTP, it works. See the screenshot below:
HTTPS URLs should onebox, too.