Trying to access google places using google api client in GAE - google-app-engine

Question

I am trying to access google places api from appengine using code like this:
String PLACES_DETAILS_URL = "https://maps.googleapis.com/maps/api/place/details/json";
// setup up the HTTP transport
HttpTransport transport = new UrlFetchTransport();
// add default headers
GoogleHeaders defaultHeaders = new GoogleHeaders();
transport.defaultHeaders = defaultHeaders;
transport.defaultHeaders.put("Content-Type", "application/json");
JsonHttpParser parser = new JsonHttpParser();
parser.jsonFactory = new JacksonFactory();
transport.addParser(parser);
// build the HTTP GET request and URL
HttpRequest request = transport.buildGetRequest();
request.setUrl(PLACES_DETAILS_URL);
GenericData data = new GenericData();
data.put("reference", restaurantGoogleId);
data.put("sensor", "false");
data.put("key", ApplicationConstants.GoogleApiKey);
JsonHttpContent content = new JsonHttpContent();
content.jsonFactory=new JacksonFactory();
content.data = data;
request.content = content;
try {
HttpResponse response = request.execute();
String r = response.parseAsString();
r=r;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
I don't know even if this is the recommended way. If so, why this doesn't work?If I put a request in the browser directly it works, but with this code it always returns me "Request Denied".
Thanks in advance.

Answer 1

At the end it was easy, I mixed get and post verbs:
HttpTransport transport = new UrlFetchTransport();
// add default headers
GoogleHeaders defaultHeaders = new GoogleHeaders();
transport.defaultHeaders = defaultHeaders;
transport.defaultHeaders.put("Content-Type", "application/json");
JsonCParser parser = new JsonCParser();
parser.jsonFactory = new JacksonFactory();
transport.addParser(parser);
// build the HTTP GET request and URL
HttpRequest request = transport.buildGetRequest();
request.setUrl("https://maps.googleapis.com/maps/api/place/details/json?reference=CmRYAAAAciqGsTRX1mXRvuXSH2ErwW-jCINE1aLiwP64MCWDN5vkXvXoQGPKldMfmdGyqWSpm7BEYCgDm-iv7Kc2PF7QA7brMAwBbAcqMr5i1f4PwTpaovIZjysCEZTry8Ez30wpEhCNCXpynextCld2EBsDkRKsGhSLayuRyFsex6JA6NPh9dyupoTH3g&sensor=true&key=<APIKEY>");
try {
HttpResponse response = request.execute();
String r = response.parseAsString();