Heyho, is there any firewall out there (preferable for arch linux) that also alerts when an app makes a request so that I can allow/deny/remember as rule? Thanks !
Probably not on Arch, at least not in their repos. Remember that Arch is for advanced users, so most of them won't even think about compiling such program, specially since this kind of Firewall would only be a necessity on a very specific kind of WebServer. If the user knows what he/she is doing then such Firewall isn't necessary.
Which doesn't make much of a sense Unless it's REALLY easy to create such Firewall. If it is, than I'm willing to help you. I'm not a programmer, but I know a thing or two about Linux firewalls.