Simple gRPC requests take much longer time for backend

Hello. I’ve tried YetAnotherHttpHandler 0.1.0 with an example gRPC Greeter service.

When published to a remote server, it takes up to 200ms longer for backend to process each request sent with YetAnotherHttpHandler than with default .NET HttpHandler. Can’t find out, why a simple echo response takes so much time.

This does not reproduce when both client and server run on a local PC.

An example Greeter service docker container I’ve used for test: https://hub.docker.com/r/tobegit3hub/grpc-helloworld

Can be started with docker run -d -p 50051:50051 tobegit3hub/grpc-helloworld

helloworld.proto for Client gRPC implementation: https://github.com/grpc/grpc/blob/master/examples/protos/helloworld.proto

Client code (remove GrpcChannelOptions to try it with default HttpHandler) :

`

using var channel = GrpcChannel.ForAddress("http://server-ip:50051", new GrpcChannelOptions()
{
    HttpHandler = new YetAnotherHttpHandler()
    {
        Http2Only = true,
        SkipCertificateVerification = true,
    }
});
    
var client = new Helloworld.Greeter.GreeterClient(channel);

Stopwatch sw = new Stopwatch();
for (int j = 0; j < 100; j++)
{
    sw.Start();
    var reply = await client.SayHelloAsync(
        new HelloRequest { Name = "GreeterClient" });
    sw.Stop();
    
    Console.WriteLine("Greeting: " + reply.Message + " " + sw.ElapsedMilliseconds);
    sw.Reset();

    await Task.Delay(500);
}  

`

The same reproduces with ASP .NET Core gRPC services and/or MagicOnion.

[pspgit]

I’m running console repro project on Windows 10:

Microsoft Windows 10 Home Version 10.0.19045 Build 19045 System Type x64-based PC Processor Intel® Core™ i7-10710U CPU @ 1.10GHz, 1608 Mhz, 6 Core(s), 12 Logical Processor(s) Total Physical Memory 31.8 GB Internet Connection: Ethernet

The above graph is from Android app.

[pspgit]

I’ve tried to run repro project in a local docker container based on Ubuntu and the issue does not reproduce. So it looks platform-dependent.

YetAnotherHttpHandler
Yet Greeting: Hello, GreeterClient! 437
Yet Greeting: Hello, GreeterClient! 136
Yet Greeting: Hello, GreeterClient! 136
Yet Greeting: Hello, GreeterClient! 136
Yet Greeting: Hello, GreeterClient! 135
Yet Greeting: Hello, GreeterClient! 135
Yet Greeting: Hello, GreeterClient! 136
Yet Greeting: Hello, GreeterClient! 135
Yet Greeting: Hello, GreeterClient! 135
Yet Greeting: Hello, GreeterClient! 135

.NET HttpHandler
.NET Greeting: Hello, GreeterClient! 346
.NET Greeting: Hello, GreeterClient! 137
.NET Greeting: Hello, GreeterClient! 134
.NET Greeting: Hello, GreeterClient! 133
.NET Greeting: Hello, GreeterClient! 134
.NET Greeting: Hello, GreeterClient! 134
.NET Greeting: Hello, GreeterClient! 134
.NET Greeting: Hello, GreeterClient! 134
.NET Greeting: Hello, GreeterClient! 134
.NET Greeting: Hello, GreeterClient! 138