Power BI Export To File API gives 403 error

Hi All,

       I am using the following code to get the responseof delay time for Export file using the Export To File API, while executing this code with valid token but i am getting 403 as response code.Any one suggest a solution to overcome this issue.

Code

public static void getSiteDetails(String accessToken) throws IOException {

URL url = new URL ("https://api.powerbi.com/v1.0/myorg/reports/57e739a8-7af7-4778-a5a1-a91976e5c7d8/ExportTo");

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

con.setRequestMethod("POST");

con.setRequestProperty("Content-Type", "application/json");

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

con.setRequestProperty("Authorization", "Bearer " + accessToken);

con.setDoOutput(true);

String jsonInputString = "{\"format\":\"PDF\" }";

try(OutputStream os = con.getOutputStream()) {

 byte[] input = jsonInputString.getBytes("utf-8");

 os.write(input, 0, input.length);

}

try(BufferedReader br = new BufferedReader( new InputStreamReader(con.getInputStream(), "utf-8"))) {
 StringBuilder response = new StringBuilder();

 String responseLine = null;

 while ((responseLine = br.readLine()) != null) {

 response.append(responseLine.trim());

 }
 System.out.println(response);
 
 }
}