diff --git a/src/Microsoft.AspNetCore.Sockets.Client.Http/HttpConnection.cs b/src/Microsoft.AspNetCore.Sockets.Client.Http/HttpConnection.cs
index ddb47474d9..ea44802378 100644
--- a/src/Microsoft.AspNetCore.Sockets.Client.Http/HttpConnection.cs
+++ b/src/Microsoft.AspNetCore.Sockets.Client.Http/HttpConnection.cs
@@ -299,6 +299,8 @@ namespace Microsoft.AspNetCore.Sockets.Client
 
                 using (var request = new HttpRequestMessage(HttpMethod.Post, urlBuilder.Uri))
                 {
+                    // Corefx changed the default version and High Sierra curlhandler tries to upgrade request
+                    request.Version = new Version(1, 1);
                     SendUtils.PrepareHttpRequest(request, _httpOptions);
 
                     using (var response = await httpClient.SendAsync(request))
diff --git a/src/Microsoft.AspNetCore.Sockets.Client.Http/SendUtils.cs b/src/Microsoft.AspNetCore.Sockets.Client.Http/SendUtils.cs
index 2a094896c0..ec7487371d 100644
--- a/src/Microsoft.AspNetCore.Sockets.Client.Http/SendUtils.cs
+++ b/src/Microsoft.AspNetCore.Sockets.Client.Http/SendUtils.cs
@@ -39,6 +39,8 @@ namespace Microsoft.AspNetCore.Sockets.Client
 
                             // Send them in a single post
                             var request = new HttpRequestMessage(HttpMethod.Post, sendUrl);
+                            // Corefx changed the default version and High Sierra curlhandler tries to upgrade request
+                            request.Version = new Version(1, 1);
                             PrepareHttpRequest(request, httpOptions);
 
                             request.Content = new ReadOnlySequenceContent(buffer);