Deprecation Warning: urldecode()

[bogdancondorachi]

Description

I found this by mistake when I've added two slashes or more after localhost:8000 and followed by a page (ex. localhost:8000//panel)

When two slashes are added I get this deprecated warning:
Deprecated: urldecode(): Passing null to parameter #1 ($string) of type string is deprecated in C:\Users\bogda\OneDrive\Projects\htdocs\double-check\vendor\getkirby\cms\router.php on line 3

When more than two slashes are added I get this deprecated notice:
Deprecated: Automatic conversion of false to array is deprecated in C:\Users\bogda\OneDrive\Projects\htdocs\double-check\vendor\getkirby\cms\src\Http\Uri.php on line 114

Expected behavior
I gues it should not show any errors or correct the url maybe??

To reproduce

1. Go to localhost:port and place two or more slashes after it followed by panel or anything else
2. You should see a deprecated warning with two slashes and a deprecated notice when more than two slashes placed

Your setup

Kirby Version
3.9.7

Console output
nothing relevant

Your system (please complete the following information)

• OS: Windows 11
• Browser: Edge
• Version: 118

Additional context
I've tested on other projects and the errors are to be reproduced only on local dev and not on production.

Edit: I've tested this on a starterkit with v4 and it still happens

[distantnative]

I've tried to replicate it but I cannot reproduce the deprecation notice.
What I do see is that adding additional slashes in between results in the home page being shown. This could be expected.

[bogdancondorachi]

For me, it happens on any project I'm trying localhost:8000//panel for example. I expect to get the home page but IDK what's up with this deprecation notice.

If you have any ideas on how to test this further, I'm eager to try out

[lukasbestle]

I can reproduce this with the built-in PHP server.

parse_url('//panel', PHP_URL_PATH) returns null because the double-slash is treated as the beginning of a protocol-relative URL. So urlencode(null) triggers the deprecation notice and the homepage is rendered.