t.Errorf("expected %d, got %d", e, a)
	}
}

func TestPingTimeoutSeconds(t *testing.T) {
	t.Setenv("HTTP2_PING_TIMEOUT_SECONDS", "60")
	if e, a := 60, pingTimeoutSeconds(); e != a {
		t.Errorf("expected %d, got %d", e, a)
	}

	t.Setenv("HTTP2_PING_TIMEOUT_SECONDS", "illegal value")
	if e, a := 15, pingTimeoutSeconds(); e != a {
		t.Errorf("expected %d, got %d", e, a)
	}
}

			return ret
		}
		ret = i
	}
	return ret
}

func pingTimeoutSeconds() int {
	ret := 15
	if s := os.Getenv("HTTP2_PING_TIMEOUT_SECONDS"); len(s) > 0 {
		i, err := strconv.Atoi(s)
		if err != nil {
			klog.Warningf("Illegal HTTP2_PING_TIMEOUT_SECONDS(%q): %v."+
				" Default value %d is used", s, err, ret)
			return ret
		}
		ret = i
	}
	return ret
}

- HTTP/2 connection health check is enabled by default in all Kubernetes clients. The feature should work out-of-the-box. If needed, users can tune the feature via the HTTP2_READ_IDLE_TIMEOUT_SECONDS and HTTP2_PING_TIMEOUT_SECONDS environment variables. The feature is disabled if HTTP2_READ_IDLE_TIMEOUT_SECONDS is set to 0. ([#95981](https://github.com/kubernetes/kubernetes/pull/95981), [@caesarxuchao](https://github.com/caesarxuchao)) [SIG API Machinery, CLI, Cloud...

connection health check is enabled by default in all Kubernetes clients to fix persistently broken connections (https://github.com/kubernetes/client-go/issues/374). If needed, users can tune the feature via the HTTP2_READ_IDLE_TIMEOUT_SECONDS and HTTP2_PING_TIMEOUT_SECONDS environment variables. The feature is disabled if HTTP2_READ_IDLE_TIMEOUT_SECONDS is set to 0. ([#100376](https://github.com/kubernetes/kubernetes/pull/100376), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, CLI, Cloud Provider,...

- HTTP/2 connection health check is enabled by default in all Kubernetes clients. The feature should work out-of-the-box. If needed, users can tune the feature via the HTTP2_READ_IDLE_TIMEOUT_SECONDS and HTTP2_PING_TIMEOUT_SECONDS environment variables. The feature is disabled if HTTP2_READ_IDLE_TIMEOUT_SECONDS is set to 0. ([#96778](https://github.com/kubernetes/kubernetes/pull/96778), [@caesarxuchao](https://github.com/caesarxuchao)) [SIG API Machinery, CLI, Cloud...