WebAPI-DealerSelection/Source/DealerSelection.Common/Middleware/SwaggerRootRoutingMiddleware.cs

using Microsoft.AspNetCore.Http;

namespace DealerSelection.Common.Middleware;

public class SwaggerRootRoutingMiddleware
{
    public const string SwaggerUrl = "help/ui";
    private readonly RequestDelegate _requestDelegate;
    private string PathBase { get; }

    public SwaggerRootRoutingMiddleware(RequestDelegate requestDelegate)
    {
        _requestDelegate = requestDelegate;
        PathBase = "/Booking/1.0";
    }

    public async Task Invoke(HttpContext context)
    
    {
        if(context.Request.Method == "GET" && context.Request.Path.Value!.Contains("/index.html", StringComparison.OrdinalIgnoreCase)
            && !context.Request.Path.Value.Contains($"{SwaggerUrl}/index.html", StringComparison.OrdinalIgnoreCase))
        {

#if DEBUG
            context.Response.Redirect($"{SwaggerUrl}/index.html");
#else
            context.Response.Redirect($"{PathBase}/{SwaggerUrl}/index.html");
#endif
            return;
        }

        await _requestDelegate(context);
    }
}