Can you achieve Http / 2 multiplexing with .Net Core HttpClient?

Question

Summary

The Http / 2 protocol provides the ability to multiplex multiple requests over a single connection. This allows you to use connections more efficiently - see https://http2.imtqy.com/faq/#why-is-http2-multiplexed

I expect that I can use .Net Core HttpClient for this. My test (based on below) however indicates that there is a ratio of requests to TCP connections: 1: 1.

Is multiplexing supported in .Net Core HttpClient? And if so, how is this achieved?

While we work

I have an example application (here you can find repo here with the following code;

using (var httpClient = new HttpClient())
{
   var request1 = new HttpRequestMessage(HttpMethod.Get, "https://www.google.com");
   request1.Version = new Version(2, 0);

   var request2 = new HttpRequestMessage(HttpMethod.Get, "https://www.google.com");
   request2.Version = new Version(2, 0);

   var task1 = httpClient.SendAsync(request1);
   var task2 = httpClient.SendAsync(request2);

   Task.WaitAll(task1, task2);

   var response1 = task1.Result;
   var response2 = task2.Result;

   Console.WriteLine($"Response 1 - Http Version: {response1.Version}, Http Status Code: {response1.StatusCode}");
   Console.WriteLine($"Response 2 - Http Version: {response2.Version}, Http Status Code: {response2.StatusCode}");
}

This code gives the following results (so I know that Http / 2 is used);

Response 1 - Http Version: 2.0, Http Status Code: OK
Response 2 - Http Version: 2.0, Http Status Code: OK

Wireshark , 2 - TLS;

HttpClient , (1 , 1 ..).

Answer 1

, ( );

, request2 HttpClient, TCP- request1. , HttpClient, .

, , (request0 ) HttpClient , (1 2) .

:

using (var httpClient = new HttpClient())
{
   // Setup first connection
   var request0 = new HttpRequestMessage(HttpMethod.Get, "https://www.google.com");
   request0.Version = new Version(2, 0);

   var task0 = httpClient.SendAsync(request0);
   var response0 = task0.Result;

   Console.WriteLine($"Response 0 - Http Version: {response0.Version}, Http Status Code: {response0.StatusCode}");

   // Now send the multiplexed requests
   var request1 = new HttpRequestMessage(HttpMethod.Get, "https://www.google.com");
   request1.Version = new Version(2, 0);

   var request2 = new HttpRequestMessage(HttpMethod.Get, "https://www.google.com");
   request2.Version = new Version(2, 0);

   var task1 = httpClient.SendAsync(request1);
   var task2 = httpClient.SendAsync(request2);

   Task.WaitAll(task1, task2);

   var response1 = task1.Result;
   var response2 = task2.Result;

   Console.WriteLine($"Response 1 - Http Version: {response1.Version}, Http Status Code: {response1.StatusCode}");
   Console.WriteLine($"Response 2 - Http Version: {response2.Version}, Http Status Code: {response2.StatusCode}");
}

Wireshark ( 1 , 1 ):

, , , . , .