Oracle MCS Custom API call from MAF Application

I have created a custom API in Oracle MCS to get the user information and trying to call it from MAF application... As a response i am getting 200 as success code... but when i try to parse the response it shows a HTML page instead of actual responce....

Custom API

https://mobileportalsetrial1304dev-mcsdem0001.mobileenv.us2.oraclecloud.com:443/mobile/custom/rvs_ekkfetchuserinfo/fetchcontent and userid=101 as parameter

Calling Method to get User information

    @Override
public Response getUserInformation(int userId) {
    System.out.println("In loginService");
    String restURI = "https://mobileportalsetrial1304dev-mcsdem0001.mobileenv.us2.oraclecloud.com:443/mobile/custom/rvs_ekkfetchuserinfo/fetchcontent?userid=" + userId;
    String jsonRequest = "";

    Response response = new Response();

    response = RestUtil.callGet(restURI, jsonRequest);

    return response;
}

callGet Method

public static Response callGet(String restURI, String jsonRequest) {
    String responseJson = "";
    Response response = new Response();
    System.out.println("restURI:" + restURI);

    RestServiceAdapter restServiceAdapter = Model.createRestServiceAdapter();
    restServiceAdapter.clearRequestProperties();
    restServiceAdapter.setConnectionName("MiddlewareAPI");
    restServiceAdapter.setRequestType(RestServiceAdapter.REQUEST_TYPE_GET);

    restServiceAdapter.addRequestProperty("Content-Type", "application/json");
    restServiceAdapter.addRequestProperty("Accept", "application/json; charset=UTF-8");
    restServiceAdapter.addRequestProperty("Oracle-Mobile-Backend-Id", "da5c7d86-29c0-43e8-b613-53de55a7ae6c");
    restServiceAdapter.addRequestProperty("Authorization", "Basic TUNTREVNMDAwMV9NT0JJTEVQT1JUQUxTRVRSSUFMMTMwNERFVl9NT0JJTEVfQU5PTllNT1VTX0FQUElEOmR5Nm91NW5wX3RnbE5r");//+new String(encodedBytes));

    restServiceAdapter.setRequestURI(restURI);
    restServiceAdapter.setRetryLimit(0);

    try {
        responseJson = restServiceAdapter.send(jsonRequest);
        System.out.println("response" + responseJson);
        int responseCode = restServiceAdapter.getResponseStatus();
        System.out.println("responseCode" + responseCode);
        response.setResponseCode(responseCode);
        response.setResponseMessage(responseJson);
        response.setHeader(restServiceAdapter.getResponseHeaders());
    } catch (Exception e) {
        System.out.println("Error in calling API" + e.getStackTrace());

        int responseCode = restServiceAdapter.getResponseStatus();
        response.setResponseCode(responseCode);
        response.setResponseMessage(responseJson);

    }


    return response;
}

Json Parsing

JSONObject obj = new JSONObject(response);
JSONArray arr = obj.getJSONArray("posts");
for (int i = 0; i < arr.length(); i++)
{
    String user_id = arr.getJSONObject(i).getString("UserId");
}

Here what i am getting is JSONObject["items"] is not found... when i print the responce message it gives a HTML Script file

Expected Output

{
    "items": [
        {
            "UserId": "101",
            "AgentId": null,
            "Category": "Rental",
            "Division": "KDR",
            "Status": null,
            "LocationId": null,
            "Operation": "CheckOut",
            "Admin": "N",
            "createdBy": "mcs-demo_user09@oracleads.com",
            "createdOn": "2015-09-25T11:29:10.215564+00:00",
            "modifiedBy": "mcs-demo_user09@oracleads.com",
            "modifiedOn": "2015-09-25T11:29:10.215564+00:00"
        }
    ]
}

Hi I got the solution... I was trying to call customAPI through Oracle-MCS. I replaced RestServiceAdapter with HttpsURLConnection. Then it Works perfectly fine.