Add slash for certain routes

[reinux]

ASP.NET routing has RouteOptions.AppendTrailingSlash, which I tried setting but it doesn't seem to do anything:

    builder.Services.Configure<RouteOptions>(fun (o: RouteOptions) ->
        o.AppendTrailingSlash <- true
    ) |> ignore

Ideally, I'd like to set it just for certain endpoints. I'm also not able to just route foo to foo/, because they are considered the same by the router. This seems like somewhat of an oversight by ASP.NET, especially as browser consider <a href="bar.html"> to mean something totally different depending on whether the page is /foo or /foo/.

In other words, unless I'm missing something, it's always necessary to provide the full path in html. That's less than ideal for composability/maintainability.

What's the correct solution here?

[64J0]

Hello @reinux, thanks for opening this discussion. Is this behavior happening when using the Endpoint Routing?

[reinux]

Say I have two routes:

GET [ route "/foo" (htmlString "<a href='bar'>To bar</a>") ]
GET [ route "/foo/bar" (htmlString "bar") ]

The link will work if I browse to the URL /foo/, but not if it's /foo.

I've tried prepending a redirect:

GET [ route "/foo" (redirectTo false "/foo/") ]

But because ASP.NET treats /foo and /foo/ as equivalent, I just get an error:

AmbiguousMatchException: The request matched multiple endpoints. Matches: HTTP: GET /foo HTTP: GET /foo/
Microsoft.AspNetCore.Routing.Matching.DefaultEndpointSelector.ReportAmbiguity(Span<CandidateState> candidateState)
Microsoft.AspNetCore.Routing.Matching.DefaultEndpointSelector.ProcessFinalCandidates(HttpContext httpContext, Span<CandidateState> candidateState)
Microsoft.AspNetCore.Routing.Matching.DefaultEndpointSelector.Select(HttpContext httpContext, Span<CandidateState> candidateState)
Microsoft.AspNetCore.Routing.Matching.DfaMatcher.MatchAsync(HttpContext httpContext)
Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.ResponseCaching.ResponseCachingMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)```

[64J0]

There seems to be something at ASP.NET itself and the AppendTrailingSlash configuration.

I filled a new issue there -> dotnet/aspnetcore#64104

[reinux]

Thanks! Appreciate the effort.

[64J0]

Hello again @reinux.

There's no easy way to configure this behavior using the Endpoint Routing module.

However, you can try the @MackinnonBuck's suggestions at the official issue, just translating the C# code into F#.

[reinux]

Looks like it. Thanks for investigating!