Web application was created as http 80, after few week they decided to switch it to https 443.
So they created AAM in CA, default zone for that WA is still http, internet zone is https.
In IIS for this WA someone already inserted https type in bindings.
At the moment, both paths are working, but users work on https. If anyone would insert httpin browser link would lead him/her to WA but as http.
I want to redirect if anyone would do try doing this in future, so if he enters http in browser, it would redirect him to https.
I tried deleting http binding of that WA from IIS. Didn't work well.
Next thing I tried is to put in Error pages additional item, here. Basically, here was added new error page of status code 403.4 with response action Respond with 302 redirect.
After this https worked but http reported 403 error.
This error (HTTP 403 Forbidden) means that Internet Explorer was able to connect to the website, but it does not have permission to view the webpage.