Error Code 411 even after Content-Length: 0

[TSERATO]

Hello,
so I have been experiencing an issue with the /pause request. I can do GET /currently-playing. But when I do /pause I first get 411. Trying to solve this issue with pauseConnection.setRequestProperty("Content-Length": "0");. Doesnt work. Then looked at this issue: Cant post the link to the issue lol. It was a issue on gh where someone had the same issue. Then I added setDoOutput(true) and getOutputStream.close(). I got the error 401 back. Thanks!. My final request (it still doesnt work -.-):

public static void togglePlayPause() {
    try {
        // Send request to pause playback
        URL pauseUrl = new URL("https://api.spotify.com/v1/me/player/pause");
        HttpURLConnection pauseConnection = (HttpURLConnection) pauseUrl.openConnection();

        // Set the request method to PUT
        pauseConnection.setRequestMethod("PUT");

        // Set the required headers
        pauseConnection.setRequestProperty("Authorization", "Bearer " + accessToken);
        pauseConnection.setRequestProperty("Content-Length", "0");

        // Enable the output stream, so we can have a request body, but don't write anything to it
        pauseConnection.setDoOutput(true); // This indicates that the connection has a body, even if it's empty

        // Since we're not sending any data, we don't need to write to the output stream
        pauseConnection.getOutputStream().close();  // Close the stream immediately without writing anything

        // Get the response code
        int responseCode = pauseConnection.getResponseCode();
        System.out.println("Response Code: " + responseCode);
    } catch (IOException e) {
        e.printStackTrace();
    }
}