403 error - JAVA 1.8

Our system does not support java.net.http.HttpClient, so I have to use java.net.URLConnection

I got 403 error

Here is my Java code,

URL url = new URL("https://authz.constantcontact.com/oauth2/default/v1/token?code="+authCode+"&redirect_uri="+redirectUri+"&grant_type=authorization_code");

HttpURLConnection http = (HttpURLConnection)url.openConnection();

http.setRequestMethod("POST");

http.setDoOutput(true);

http.setRequestProperty("Accept", "application/json");

http.setRequestProperty("Authorization", authHeader);

http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

http.setRequestProperty("Content-Length", "0");

System.out.println(http.getResponseCode() + " " + http.getResponseMessage());

StringBuffer temp = new StringBuffer();

Scanner scan = new Scanner(http.getInputStream(), "UTF-8");

// Scanner scan = new Scanner(http.getInputStream());

while (scan.hasNext()) {

temp.append(scan.nextLine());

}

scan.close();

http.disconnect();

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