Blazor - (client side) Route parameter with dot (.) not working

[royzhang666]

Describe the bug

The client side blazor (wasm) component cannot match the route parameter with dot (.) when you open the link the first time, instead it will return 404 error. It worked when you navigate from other blazor components.

To Reproduce

Steps to reproduce the behavior:

1. Using this version of ASP.NET Core 3.0.0-preview8.19405.7
2. Run this blazor component

@page "/hellow/{Name}"

@Name

@code
{
    [Parameter]
    public string Name { get; set; }
}

3. With these arguments '/hellow/hello.world'
4. See error: 404

Expected behavior

the page containing name hello.world

Screenshots

If applicable, add screenshots to help explain your problem.

[rynowak]

The route that's added by default when you use MapFallbackToClientSideBlazor (in Startup) intentionally does not match URLs that look like filenames (contains a . surrounded by other characters in the last segment). This is on purpose so that your app will give a proper 404 for requests that don't match a static file.

If you want to change this, specify your own route pattern - you could use {**path} and then it will happily match files if that's what you want.

[mkArtakMSFT]

We'll try to cover this with docs.

[pranavkm]

Doing this for you.