User (with space character) can not login, not authorized

Expected behaviour

In iOS app, logging in to a server with the username/password and should be able to see content.

Actual behaviour

Logging in when a username contains a space, able to grant access and then get a 401 when I get to the files page

When I viewed the NGINX logs, there is a plus added where the space is, causing the user name to be invalid.

Example:
Username of Test User turns into Test+User when logging in, which I assume causes the failure

This appeared to have been fixed with #493

Steps to reproduce

Create a username with a space and try to login via the iOS app

Reasoning or why should it be changed/implemented?

Unable to login via the login flow.

However, I was able to bypass this issue by logging in with a QR code

iOS version

13.5.1

App version

3.0.0.76

Server configuration

Operating system:

Debian 10

Web server:

Apache/2.4.38

Database:

Postgres 12.2

PHP version:

PHP 7.3.17

Nextcloud version: (see Nextcloud admin page)

18.0.4

No source file or test is named. Reproduce the login flow with a username containing a space, then inspect the iOS login path and compare it with the QR-code path and the behavior described in #493. Done means the username remains valid and the files page does not return a 401.