Unable to create a new dashboard using grafana http api

I use the example given in the http api reference.

http://localhost:3000/api/dashboards/db HTTP/1.1
Accept: application/json
Content-Type: application/json
Authorization: eyJrIjoiY2JKaXJsRzhNWklDQ0t2QmxlMDJTczJ2Mlp5WUxXSHYiLCJuIjoiU2FyYXRoIiwiaWQiOjF9

{
“dashboard”: {
“id”: null
},
“folderId”: 0,
“overwrite”: false,
“message”:“rti sample”
}
This is the final URL

http://localhost:3000/api/dashboards/db HTTP/1.1 Accept: application/json Content-Type: application/json Authorization: eyJrIjoiY2JKaXJsRzhNWklDQ0t2QmxlMDJTczJ2Mlp5WUxXSHYiLCJuIjoiU2FyYXRoIiwiaWQiOjF9 { “dashboard”: { “id”: null }, “folderId”: 0, “overwrite”: false, “message”:“rti sample” }

I always end up getting:

{“message”:“Not found”}

I am putting this POST request via a Java code

private static void sendPOST() throws IOException {

	POST_URL = "http://localhost:3000/api/dashboards/db";
	POST_PARAMS = "{ \"dashboard\": { \"id\": null }, \"folderId\": 0, \"overwrite\": false, \"message\": \"rti sample\" }";
	
	URL obj = new URL(POST_URL);
	HttpURLConnection con = (HttpURLConnection) obj.openConnection();
	con.setRequestMethod("POST");
			
	con.setRequestProperty("Accept", "application/json");
	con.setRequestProperty("Content-Type", "application/json");
	con.setRequestProperty("Authorization", "Bearer eyJrIjoiY2JKaXJsRzhNWklDQ0t2QmxlMDJTczJ2Mlp5WUxXSHYiLCJuIjoiU2FyYXRoIiwiaWQiOjF9");
	//con.setRequestProperty("User-Agent", USER_AGENT);

	// For POST only - START
	con.setDoOutput(true);
	OutputStream os = con.getOutputStream();
	os.write(POST_PARAMS.getBytes());
	os.flush();
	os.close();
	// For POST only - END

	int responseCode = con.getResponseCode();
	System.out.println("POST Response Code :: " + responseCode);

	if (responseCode == HttpURLConnection.HTTP_OK) { //success
		BufferedReader in = new BufferedReader(new InputStreamReader(
				con.getInputStream()));
		String inputLine;
		StringBuffer response = new StringBuffer();

		while ((inputLine = in.readLine()) != null) {
			response.append(inputLine);
		}
		in.close();

		// print result
		System.out.println(response.toString());
	} else {
		System.out.println("POST request not worked");
	}
}

I get the following error:

POST Response Code :: 40

I tried reading up a lot, but i didnt get it to work.
Please help.

Actually Ignore this, I got it working.