.net core , how to handle route with extra leading slash

I need to handle an incoming request which is of the form:
//ohif/study/1.1/series
Note the exta slash at the front

My controller signature is:

[Route("ohif/study/{studyUid}/series")]
[HttpGet]
public IActionResult GetStudy(string studyUid)

If I modify the incoming request to /ohif/study/1.1/series it works fine

however when I use //ohif/study/1.1/series, the route is not hit

Additionally I also tried: [Route(“/ohif/study/{studyUid}/series”)]
and [Route(“//ohif/study/{studyUid}/series”)]

Both fail. I unfortunately cannot change the incoming request as it is from an external application. Is there some trick to handle this route? I am working in .NET Core 3.0.

Update NOTE:
I have logging activated and I see that asp.net core is analyzing the route, I have the message:
No candidates found for the request path ‘//ohif/study/1.1/series’
for the logger Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware

Answers:

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Method 1

What about the middleware to handle double slash?

app.Use((context, next) =>
            {
                if (context.Request.Path.Value.StartsWith("//"))
                {
                    context.Request.Path = new PathString(context.Request.Path.Value.Replace("//", "/"));
                }
                return next();
            });

Method 2

Rewrite the URL at the web server-level, e.g. for IIS, you can use the URL Rewrite Module to automatically redirect //ohif/study/1.1/series to /ohif/study/1.1/series. This isn’t a job for your application.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0