How to redirect from http to https in iptables?

Question

iptables

Good afternoon!

I can't set up iptables correctly.
I have a certain resource that is running on port 8443, I need incoming connections to http and https (i.e. 80 and 443) to be redirected to 8443.
Or rather, it’s even easier to redirect to https when trying to access http, but now from https to 8443, while ports 80 and 8443 were closed to outside access.

Answer 1

As it is difficult, in my opinion, the task is described. I don't want to read. :)
There is a redirect key in iptables, it works in a NAT table.
For example:
It will redirect traffic coming to interface eth0 with destination port 80 to port 3128.
In other words, a typical traffic redirect to squid.

Answer 2

It seems to me that it is better to solve this problem at the level of the web server.

Answer 3

In general, I combined a couple of methods: firstly, nat iptables, and secondly, in the application itself, I added a function to process requests from another port. I broke the documentation several times and did not find a documented solution in my own way. So far so good in tests.