Add default http request version and policy (#6641)

src/HotChocolate/AspNetCore/src/Transport.Http/DefaultGraphQLHttpClient.cs

@@ -103,6 +103,10 @@ private async Task<GraphQLHttpResponse> ExecuteInternalAsync(
         // DO NOT move the writer out of this method.
         using var arrayWriter = new ArrayWriter();
         using var requestMessage = CreateRequestMessage(arrayWriter, request, requestUri);
+#if NET5_0_OR_GREATER
+        requestMessage.Version = _http.DefaultRequestVersion;
+        requestMessage.VersionPolicy = _http.DefaultVersionPolicy;
+#endif
         var responseMessage = await _http.SendAsync(requestMessage, ResponseHeadersRead, ct).ConfigureAwait(false);
         return new GraphQLHttpResponse(responseMessage);
     }

src/HotChocolate/AspNetCore/test/Transport.Http.Tests/GraphQLHttpClientConfigurationTests.cs

@@ -0,0 +1,35 @@
+using System.Net;
+using static HotChocolate.AspNetCore.Tests.Utilities.TestServerExtensions;
+
+namespace HotChocolate.Transport.Http.Tests;
+
+public class GraphQLHttpClientConfigurationTests
+{
+    [Fact]
+    public async Task DefaultRequestVersion()
+    {
+        var httpClient = new HttpClient(new TestHttpMessageHandler(
+            request =>
+            {
+                Assert.Equal(HttpVersion.Version20, request.Version);
+                Assert.Equal(HttpVersionPolicy.RequestVersionOrHigher, request.VersionPolicy);
+                return new();
+            }
+        ))
+        {
+            DefaultRequestVersion = HttpVersion.Version20,
+            DefaultVersionPolicy = HttpVersionPolicy.RequestVersionOrHigher,
+        };
+
+        var client = GraphQLHttpClient.Create(httpClient, true);
+        await client.SendAsync(new("{ __typename }", new(CreateUrl(default))), default);
+    }
+
+    class TestHttpMessageHandler(Func<HttpRequestMessage, HttpResponseMessage> sender) : HttpMessageHandler
+    {
+        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+        {
+            return Task.FromResult(sender.Invoke(request));
+        }
+    }
+}