Uri.TryCreate returns different results on Windows and Linux

[WernerMairl]

Description

It seems that the following call returns different results on Windows (current .Net 6 SDK on Windows 11 Desktop, latest Visual Studio) and Linux (Github Action with current .Net 6 SDK, ubuntu-latest, dotnet-version 6.0.x)!
Not testet with .Net 7 RCx!

Uri.TryCreate("/vendor.test.js",Urikind.Absolute, out var result)

On Windows the TryCreate function returns bool.false
On my CI Server (Github current Ubuntu) it returns true, and the outcoming Uri from type "file://"

No time for deeper investigations at this moment, but I hope that helps....

BR
Werner

Reproduction Steps

Uri.TryCreate("/vendor.test.js",Urikind.Absolute, out var result)

Expected behavior

whatever it comes out: ist should be the same on Windows and Linux

Actual behavior

Different results between Windows and Linux

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

No response

[ghost]

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Issue Details

---

Description

It seems that the following call returns different results on Windows (current .Net 6 SDK on Windows 11 Desktop, latest Visual Studio) and Linux (Github Action with current .Net 6 SDK, ubuntu-latest, dotnet-version 6.0.x)!
Not testet with .Net 7 RCx!

Uri.TryCreate("/vendor.test.js",Urikind.Absolute, out var result)
On Windows the TryCreate function returns bool.false
On my CI Server (Github current Ubuntu) it returns true, and the outcoming Uri from type "file://"

No time for deeper investigations at this moment, but I hope that helps....

BR
Werner

Reproduction Steps

Uri.TryCreate("/vendor.test.js",Urikind.Absolute, out var result)

Expected behavior

whatever it comes out: ist should be the same on Windows and Linux

Actual behavior

Different results between Windows and Linux

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

No response

Author:	WernerMairl
Assignees:	-
Labels:	area-System.Net
Milestone:	-

[stephentoub]

This is by design. For better or worse, Uri supports parsing file paths, and on Linux "/vendor.test.js" is a valid absolute file path.

[WernerMairl]

Unexpected but acceptable

Feel free to close the issue

[MihaZupan]

For reference, once #59099 (comment) is implemented, you should be able to avoid this by doing

var options = new UriCreationOptions
{
    UriKind = Urikind.Absolute,
    AllowImplicitFilePaths = false
};

Uri.TryCreate("/vendor.test.js", options, out Uri uri)