Falls back to SPDY for gorilla/websocket https proxy error

Kubernetes-commit: 6450174ac9a07f15aecfa5f05d58755efc2192b7

tools/remotecommand/websocket_test.go

@@ -39,6 +39,7 @@ import (
 	v1 "k8s.io/api/core/v1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/httpstream"
 	"k8s.io/apimachinery/pkg/util/httpstream/wsstream"
 	"k8s.io/apimachinery/pkg/util/remotecommand"
 	"k8s.io/apimachinery/pkg/util/wait"
@@ -814,6 +815,42 @@ func TestWebSocketClient_BadHandshake(t *testing.T) {
 	}
 }
 
+// See (https://github.com/kubernetes/kubernetes/issues/126134).
+func TestWebSocketClient_HTTPSProxyErrorExpected(t *testing.T) {
+	urlStr := "http://127.0.0.1/never-used" + "?" + "stdin=true" + "&" + "stdout=true"
+	websocketLocation, err := url.Parse(urlStr)
+	if err != nil {
+		t.Fatalf("Unable to parse WebSocket server URL: %s", urlStr)
+	}
+	// proxy url with https scheme will trigger websocket dialing error.
+	httpsProxyFunc := func(req *http.Request) (*url.URL, error) { return url.Parse("https://127.0.0.1") }
+	exec, err := NewWebSocketExecutor(&rest.Config{Host: websocketLocation.Host, Proxy: httpsProxyFunc}, "GET", urlStr)
+	if err != nil {
+		t.Errorf("unexpected error creating websocket executor: %v", err)
+	}
+	var stdout bytes.Buffer
+	options := &StreamOptions{
+		Stdout: &stdout,
+	}
+	errorChan := make(chan error)
+	go func() {
+		// Start the streaming on the WebSocket "exec" client.
+		errorChan <- exec.StreamWithContext(context.Background(), *options)
+	}()
+
+	select {
+	case <-time.After(wait.ForeverTestTimeout):
+		t.Fatalf("expect stream to be closed after connection is closed.")
+	case err := <-errorChan:
+		if err == nil {
+			t.Errorf("expected error but received none")
+		}
+		if !httpstream.IsHTTPSProxyError(err) {
+			t.Errorf("expected https proxy error, got (%s)", err)
+		}
+	}
+}
+
 // TestWebSocketClient_HeartbeatTimeout tests the heartbeat by forcing a
 // timeout by setting the ping period greater than the deadline.
 func TestWebSocketClient_HeartbeatTimeout(t *testing.T) {