Invalid server URL at login

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I saw other "invalid URL" issues that seemed related but most of them are either quite old or hitting at a different moment (people seem to be able to log in), so I open a new one.

Steps to reproduce

1. Log out or install the app to get to self-hosted server URL page
2. Enter server URL
3. Fail

Expected behaviour

The app should redirect to the user login screen.

Actual behaviour

Right when typing enter after the server URL, get pop-up message "Invalid URL".

Logs

Unfortunately, I don't have any logs.

Reasoning or why should it be changed/implemented?

The server is fully functional, accessible from the URL https://nessie.kimou.fr from a web browser, from the Android client, from the Linux and Windows desktop apps. I don't have access to a different iOS device to test if the problem is this specific device or the iOS app in general.

Environment data

iOS version: e.g. iOS 18.6.2

Nextcloud iOS app version: 7.1.2

Server operating system: docker

Web server: nginx (swag)

Database: mysql 11.4.8

PHP version: 8.3.25

Nextcloud version: 31.0.8

Start at the iOS app's self-hosted server URL page and reproduce the failure with https://nessie.kimou.fr, comparing the behavior with the web, Android, Linux, and Windows clients. Trace the URL validation and login redirect flow; done means a valid server URL proceeds to the user login screen without the "Invalid URL" popup.