Need to match a malformed URL generated by a client app

[bmatatuk]

Hi
I have a Reverse Proxy configured and is working fine. But, I found there is a bunch of client application that is generating a malformed URL. I found the URL has a double forward slash.

The correct URL is https://customer1.domain.com/api/v1/connection/status. But one of the client applications is generating https://customer1.domain.com//api/v1/connection/status. If you notice, there are 2 forward slashes before api!

Is there any way I can match both of these variants (single or double slashes) in the path using regular expression? I do not want to duplicate the route.

My current code in the configuration is :
... "Match": { "Path": "/api/{**catch-all}", "Hosts": [ "customer1.domain.com" ] }, ...
I tried a few things with Regular Expression but didn't work. Any help is appreciated

Thanks

[MihaZupan]

Is there any way I can match both of these variants (single or double slashes) in the path

The configuration you are using ("/api/{**catch-all}") will already match both /api/foo and /api//bar.

YARP will forward these requests as-is. That is, the backend destination will also see /api/foo and /api//bar.
Are you looking to configure YARP such that it accepts both, but forwards them on in a normalized format (/api/foo and /api/bar)?

[bmatatuk]

Thanks for the response.

If you see my post, the double slash is soon after the host and NOT further down the path.

It match https://customer1.domain.com/api/v1/connection/status. But, it DOES NOT https://customer1.domain.com//api/v1/connection/status

NOTE: I have configured InterceptorFactory on the proxy app to test different scenarios.

Hope that make sense.

Thanks

[MihaZupan]

I don't know if there's a convenient way to achieve this in routing, but you can insert a small middleware before routing happens that corrects such requests.

For example, this will also handle domain.com////api/foo

app.Use((context, next) =>
{
    var path = context.Request.Path.Value.AsSpan();
    if (path.StartsWith("//", StringComparison.Ordinal))
    {
        context.Request.Path = new PathString(string.Concat("/", path.TrimStart('/')));
    }

    return next();
});

app.UseRouting();

[bmatatuk]

Fantastic solution... That worked like a charm!!!! Saved my day

Thank you so much for your help.