[Bug]: Port no longer showing in podcasts generated in 2.17.5 and newer

[andrewinmoco]

What happened?

After upgrading to the current audiobookshelf I'm unable play RSS feeds generated ion my podcast player. When investigating this I found that the port for the web server is no longer included in the generated RSS feed which means that the MP3 files can't be downloaded.

Working item from RSS feed generated in 2.17.4

Non working item from RSS feed generated in 2.17.5

What did you expect to happen?

I expect the port to be included in the URL to download the JPG and the MP3.

Steps to reproduce the issue

1. Generate a RSS feed for a book while not on port 443
2. Attempt to load the RSS feed in a podcast reader

Audiobookshelf version

v2.17.7

How are you running audiobookshelf?

Docker

What OS is your Audiobookshelf server hosted from?

Linux

If the issue is being seen in the UI, what browsers are you seeing the problem on?

None

Logs

No response

Additional Notes

No response

[advplyr]

I see that this is a bug with express stripping the port. It doesn't strip the port number in all cases though so I haven't reproduced the issue.

https://expressjs.com/en/guide/migrating-5.html#req.host

In Express 4, the req.host function incorrectly stripped off the port number if it was present. In Express 5, the port number is maintained.

We can see about migrating to express 5 to resolve this.

Relevant PR #3692 @mikiher