//使用默认文件
app.UseDefaultFiles();
//开启静态文件
app.UseStaticFiles();
app.UseStaticFiles(new StaticFileOptions
{ContentTypeProvider = new FileExtensionContentTypeProvider(new Dictionary{{ ".apk", "application/vnd.android.package-archive" },{ ".wgt", "application/octet-stream" },{ ".nupkg", "application/zip" }})
});