Str::isUrl() returns false on single char domain name

[lakuapik]

Laravel Version

12.49.0

PHP Version

8.5.2

Database Driver & Version

mysql on gnu/linux

Description

When using Str::isUrl() to validate url, it doesnt support single char domain name, it returns false.

---

My use case is, i setup an alias l as 127.0.0.1 at /etc/hosts, using livewire v4 it fails to load livewireScripts (depend on this helper at https://github.com/livewire/livewire/blob/95bb36a6fd720d67ccee3adc2ae64864407082e0/src/Mechanisms/FrontendAssets/FrontendAssets.php#L201).

expected: http://l:8000/livewire-1c0eda25/livewire.js?

Steps To Reproduce

Use tinker.

[github-actions]

Thank you for reporting this issue!

As Laravel is an open source project, we rely on the community to help us diagnose and fix issues as it is not possible to research and fix every issue reported to us via GitHub.

If possible, please make a pull request fixing the issue you have described, along with corresponding tests. All pull requests are promptly reviewed by the Laravel team.

Thank you!

[irabbi360]

Str::isUrl() returns false because it validates URL syntax, not DNS resolution. Even though l resolves via /etc/hosts, a single-letter hostname without a TLD is not RFC-valid, so Laravel (via FILTER_VALIDATE_URL) rejects it.