Calling a Web Service (containg multiple pages) does not load all the pages (without an added sleep delay) - web-services

Question

My question is about a strange behavious I notice both on my iPhone device and the codenameone simulator (NetBeans).
I invoke the following code below which calls a google web service to provide a list of food places around a GPS coordinate:
The web service that is called is as follows (KEY OBSCURED):
https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=40.714353,-74.00597299999998&radius=200&types=food&key=XXXXXXXXXXXXXXXXXXXXXXX
Each result contains the next page token and thus, the second call (for the subsequent page) is as follows:
https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=40.714353,-74.00597299999998&radius=200&types=food&key=XXXXXXXXXXXXXXXXXXXXXXX&pagetoken=YYYYYYYYYYYYYYYYYY
public static byte[] getWSResponseData(String urlString, boolean usePost)
{
ConnectionRequest r = new ConnectionRequest();
r.setUrl(urlString);
r.setPost(usePost);
InfiniteProgress prog = new InfiniteProgress();
Dialog dlg = prog.showInifiniteBlocking();
r.setDisposeOnCompletion(dlg);
NetworkManager.getInstance().addToQueueAndWait(r);
try
{
Thread.sleep(2000);
}
catch (InterruptedException ex)
{
}
byte[] responseData = r.getResponseData();
return responseData;
}
public static void getLocationsList(double lat, double lng)
{
boolean done = false;
while (!done)
{
byte[] responseData = getWSResponseData(finalURL,false);
result = Result.fromContent(parser.parseJSON(new InputStreamReader(new ByteArrayInputStream(responseData))));
String venueNames[] = result.getAsStringArray("/results/name");
nextToken = result.getAsString("/next_page_token");
if ( nextToken == null || nextToken.equals(""))
done = true;
else
finalURL = completeURL + "&pagetoken=" + nextToken;
}
.....
}
This code works fine with the sleep timer, but when I remove the Thread.sleep, only the first page gets called.
Any help would be appreciated.
Using the debugger does not help as this is a timing issue and the issue does not occur when using the debugger.
Also when I put some print statements into the code
while (!done)
{
String nextToken = null;
**System.out.println(finalURL);**
...
}
System.out.println("Total Number of entries returned: " + itemCount);
I get the following output:
First Run (WITHOUT SLEEP):
https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=40.714353,-74.00597299999998&radius=200&types=food&key=XXXXXXXX
https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=40.714353,-74.00597299999998&radius=200&types=food&key=XXXXXXXX&pagetoken=CqQCF...
Total Number of entries returned: 20
Using the network monitor I see that the response to the second WS call returns:
{
"html_attributions" : [],
"results" : [],
"status" : "INVALID_REQUEST"
}
Which is strange as when I cut and paste the WS URL into my browser, it works fine...
Second Run (WITH SLEEP):
https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=40.714353,-74.00597299999998&radius=200&types=food&key=XXXXXXXXX
https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=40.714353,-74.00597299999998&radius=200&types=food&key=XXXXXXXXX&pagetoken=CqQCFQEAA...
https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=40.714353,-74.00597299999998&radius=200&types=food&key=XXXXXXXXX&pagetoken=CsQDtQEAA...
Total Number of entries returned: 60

Answer 1

Well it seems to be a google API issue as indicated here:
Paging on Google Places API returns status INVALID_REQUEST
I still could not get it to work by changing the WS URL with a random parameter as they suggested, but I will keep trying and post something here if I get it to work. For now I will just keep a 2 second delay between the calls which seems to work.

Answer 2

Well gave up on using the google WS for this and switched to Yelp, works very well:
https://api.yelp.com/v3/businesses/search?.....