Using JSON-P to parse heterogeneous JSON in HTTP responses

Suppose you need to query Facebook Graph API. The responses to your HTTP requests have JSON format. A very convinient Java API for JSON Processing helps to parse and query the heterogeneous JSON responses.

For example, I try to get an email of the user whose access token was obtained after the user's login into my application. For this, I access url like:

https://graph.facebook.com/v2.11/me?access_token=EAAFzBKZBWT9QBAHzWcGGSy5GepjlS9S1YEPvN1p2jwaGxc0QZCaVoAZCmsZB8YaE1AkegbmObdBDY64DDD1t1kxezOgpEFKbbLKlyQyPcEiyUZCwSI3iJOhe9ioahZA9Ye6hvOybhzGeOODFdihEnPbuw5sso5CzPEZAQL1RkdM3cfKajOdKsPmMWOvNhrDtE0ZD&debug=all&fields=email&format=json&method=get&pretty=0

The reponse is a JSON with some hexadecimal digits encoding @ character:

{"email":"marian.caikovski\u0040mail.ru","id":"10215579219697013","__debug__":{}}

To easily execute an HTTP request, parse the response and get the decoded email property I use:

String readUserEmailFromGraphAPI(String token) throws IOException {
    try (JsonReader jsonReader = Json.createReader(
            new InputStreamReader(
                    new URL("https://graph.facebook.com/v2.11/me?access_token=" + token + "&debug=all&fields=email&format=json&method=get&pretty=0")
                            .openStream()))) {
        JsonObject obj = jsonReader.readObject();
        return obj.getString("email");
    }
}