Symfony version(s) affected: 2.8.44

Description
After updating an application to 2.8.44 and initially setting x-forwarded-port header and then making request which will be making sub request \Symfony\Component\HttpFoundation\Exception\ConflictingHeadersException is being triggered which causes application to crash. This didn't happen prior to 2.8.44 release.

How to reproduce
Add x-forwarded-port header and make request which will be making sub requests.