Description:

The images in the link previews are broken due to the src attribute of those img tags missing the original origin. To give an example like jitsi, posting a jitsi channel url like https://meet.jit.si/foobar should result in src url within the preview of https://meet.jit.si/images/jitsilogo.png?v=1 however it only has /images/jitsilogo.png?v=1 set. Which leads to broken preview links. The android app works fine, the web version has the issue.

Server Setup Information:

• Version of Rocket.Chat Server: 2.2.1
• Operating System: Linux
• Deployment Method: Cloudron
• Number of Running Instances: 1
• Oplog: Enabled
• NodeJS Version: v8.12.0
• MongoDB Version: 3.6.3

Client Setup Information

• Desktop App or Browser Version: Firefox 70/71
• Operating System: Linux