public async Task InitialHttp2StreamWindowSize_SentInSettingsFrame()
{
const int WindowSize = 123456;
using Http2LoopbackServer server = Http2LoopbackServer.CreateServer();
using var handler = CreateHttpClientHandler();
GetUnderlyingSocketsHttpHandler(handler).InitialHttp2StreamWindowSize = WindowSize;
using HttpClient client = CreateHttpClient(handler);
Task <HttpResponseMessage> clientTask = client.GetAsync(server.Address);
Http2LoopbackConnection connection = await server.AcceptConnectionAsync().ConfigureAwait(false);
SettingsFrame clientSettingsFrame = await connection.ReadSettingsAsync().ConfigureAwait(false);
SettingsEntry entry = clientSettingsFrame.Entries.First(e => e.SettingId == SettingId.InitialWindowSize);
Assert.Equal(WindowSize, (int)entry.Value);
}