public override async Task DuplexStreamingServerHandler <TRequest, TResponse>(IAsyncStreamReader <TRequest> requestStream, IServerStreamWriter <TResponse> responseStream, ServerCallContext context, DuplexStreamingServerMethod <TRequest, TResponse> continuation)
{
try
{
//因此地方不能正確的讀到Request.Body或Response.Body
//且也不能去讀requestStream & responseStream，會造成主邏輯會讀到空，stream類型的log可能要改成IActionFilter
await base.DuplexStreamingServerHandler(requestStream, responseStream, context, continuation);
}
catch (Exception e)
{
LogExceptionAndReturnResponse(context.Method, requestStream.ToString(), responseStream.ToString(), e);
}
}