在Java中，你可以使用SSL连接的参数来查看服务器发送给你的信息。以下是一个示例：

```java URL url = new URL("http://example.com"); try { HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setRequestProperty("Upgrade-Insecure-Requests", "1"); connection.setRequestProperty("Connection", "Upgrade"); connection.setRequestProperty("Content-Type", "application/json"); connection.setRequestProperty("Sec-WebSocket-Extensions", "bar");

// Get the WebSocket Upgrade request header
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();

while ((inputLine = in.readLine()) != null) {
    response.append(inputLine);
}

in.close();

// Get the WebSocket Upgrade response header
int statusLine = connection.getResponseCode();
if (statusLine == HttpURLConnection.HTTP_OK) {
    String UpgradeResponse = connection.getResponseMessage();
    System.out.println("Upgrade Response: " + UpgradeResponse);
}

} catch (Exception e) { e.printStackTrace(); } ```

在这个示例中，我们首先创建了一个URL对象，然后使用这个URL创建了一个HttpURLConnection对象。然后，我们设置了一些HTTP头，包括"Upgrade-Insecure-Requests"，"Connection"和"Content-Type"。最后，我们发送了一个Upgrade请求到服务器，并获取了服务器的响应。

然后，我们读取服务器的响应，并从中获取了"Upgrade Response"头。如果这个头是一个有效的响应，我们就打印出来。