Add hostname as template param

[Bored0ne]

Steps to reproduce

1. Go to url tab of new external site & add http://{url}

Expected behaviour

Expect to see http://localhost when clicked

Actual behaviour

I'm not allowed to save it with that.

My reasoning is that I'm on a shitty At&t router & the damn thing doesn't resolve my local server at my hostname from my internal network. Which means that when I'm at home the hostname would be 192.168.1.* but when I'm out it's my domain. I'm okay with this behavior, but when I wanna make my own embedded apps for my local server I can't because it won't resolve when I'm outside the network. I would like it so that this would grab the hostname from the request info & embed it that way.

[madumlao]

Probably related to and solves the same problem as #120 which I am running into.

Same as above, my internal router (1) doesnt have DNS entries for local machines and (2) will resolve my FQDN to the external IP. The effect is that if I have another app on the same server (eg /transmission, or /jellyfin) and I access from a local IP (eg 192.168.1.x), the iframe loads from the internet whereas nextcloud loads from the local network. This is not ideal as the local network will likely be considerably faster than my router internet and may have relaxed security controls.

In the above issue the request was to allow relative URLs, which was rejected due to compat issues, but this is really the same kind of issue - compatibility / convenience for other apps sharing the same URL scheme. Just to add then, this proposal will need template variables for both the current hostname and protocol to ensure compatbility, so you can put in:

{proto}://{hostname}/something

Or alternatively, revisit the above issue and have logic that will automatically parse

/foo

as an implicit

{proto}://{hostname}/something

which should resolve to the proto / hostname of the current session, possibly falling back to the canonical if indeterminate

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