Host Blazor WebAssembly App using Kestrel

[littletoxic]

I published my Blazor WebAssembly App and now I want to host Blazor WebAssembly App using Kestrel
I wrote code like

app.MapStaticAssets("Client.staticwebassets.endpoints.json");
app.MapFallbackToFile("index.html");

when I access localhost:port/not-exist it returned me the index page, but when I access localhost:port/not-exist.html it returned me 404
How do I fix this