Why does Jenkins complain that my reverse proxy setup is broken?

Question

I have no idea why after Jenkins is updated to version 1.591 (Ubuntu Server 12.04), the originally correctly set up reverse proxy now becomes broken. My current setting is e

Answer 1

For me, the fix was to add:

RequestHeader set X-Forwarded-Proto "https"
RequestHeader set X-Forwarded-Port "443"

This made it stop complaining.