CLM 5.0.2 , trying to connect to RQM using the HTTP query and it is not returning the XML rather a html file

The code we are using to connect RQM are -
1. Login - We get no error
    public int login(String userid, String password) {
        this.userid = userid;
        this.password = password;

        int code = 0;
        try {
            httpclient.registerTrustingSSL();
            int ret = httpclient.login(userid, password);
            if (ret == HttpURLConnection.HTTP_UNAUTHORIZED) {
                System.out.println("RQMUrlUtility: Cannot authenticate to server for user "
                        + userid);
                code = -1;
            } else if (ret == HttpURLConnection.HTTP_CLIENT_TIMEOUT) {
                System.out.println("RQMUrlUtility: Timeout authenticating to server for user "
                        + userid);
                code = -1;
            }
        } catch (Exception e) {
            System.out.println("RQMUrlUtility: Cannot authenticate to server " + e);
            code = -1;
        }
        return code;
    }
}

then http query to get a test plan

Request Parameters -

USername, password, query URL

This is the query we are using to get a Test Plan-
https://<host>:<port>/qm/service/com.ibm.rqm.integration.service.IIntegrationService/resources/<Project Area>/testplan

The code snippet to do the GET is:

    RQMUrlUtlyLogin.getHttpClient().fixMethodHeader(method);

                    /*
                     * Check for the Server Response for the GET Operation
                     */
                   
                    int responseCode = RQMUrlUtlyLogin.getHttpClient().executeMethod(
                            method);
                    if (responseCode != HttpStatus.SC_OK) {
                        System.err.println("RQMUrlUtility: Method failed: "
                                + method.getStatusLine());
                        return;
                    }
                    System.out.println("RQMUrlUtility: Server Response code: " + responseCode);

                    if (responseCode<400)
                    {
                        // Read the responseCode body.
                        byte[] responseBody = method.getResponseBody();
                        BufferedWriter out = new BufferedWriter(new FileWriter(
                                sPath));
                        out.write(new String(responseBody));
                        out.close();
                        System.out
                                .println("RQMUrlUtility: [ SUCESS ] XML string retrieved from URL : \""
                                        + sAttachURL
                                        + " \" is written to file located at -: \" "
                                        + sPath + " \"");
                    }
                   
                }

This worked fine until version 5.0.1.
Is there any suggestion as to how to make it work for 5.0.2?