pokashumbraco/POKASH/CustomAPI/UrlEncodingMiddleware.cs

using Microsoft.AspNetCore.Http;
using System.Threading.Tasks;

public class UrlEncodingMiddleware
{
    private readonly RequestDelegate _next;

    public UrlEncodingMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task InvokeAsync(HttpContext context)
    {
        if (context.Request.Path.Value != null && context.Request.Path.Value.StartsWith("/api", StringComparison.OrdinalIgnoreCase))
        {
            if (context.Request.Path.Value.Contains("."))
            {
                var newPath = context.Request.Path.Value.Replace(".", "%2E");
                context.Request.Path = new PathString(newPath);
            }
        }
        await _next(context);
    }
}