How to build the body of a request in json format

Here is the request I should call:
listing library contents
>GET https://photoslibrary.googleapis.com/v1/mediaItems
Content-type: application/json
Authorization: Bearer oauth2-token
{
"pageSize": "100",
}

Here's what I tried:

public String getJSON(String url, int timeout) {
		String body1 = "{pageSize: 100,}";
		String body2 = "{\"pageSize\": \"100\",}";
		HttpURLConnection request = null;
		try {
			URL u = new URL(url);
			request = (HttpURLConnection) u.openConnection();

			request.setRequestMethod("GET");
			request.setRequestProperty("Authorization", "Bearer " + token);
			request.setRequestProperty("Content-Type", "application/json; charset=UTF-8");

			request.setUseCaches(false);
			request.setAllowUserInteraction(false);
			request.setConnectTimeout(timeout);
			request.setReadTimeout(timeout);
			request.setRequestProperty("Content-Length", String.format(Locale.ENGLISH, "%d", body2.getBytes().length));
			OutputStream outputStream = request.getOutputStream();
			outputStream.write(body2.getBytes());
			outputStream.close();
			request.connect();
			int status = request.getResponseCode();

			switch (status) {
				case 200:
				case 201:
					BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream()));
					StringBuilder sb = new StringBuilder();
					String line;
					while ((line = br.readLine()) != null) {
						sb.append(line+"\n");
					}
					br.close();
					return sb.toString();
			}

		} catch (MalformedURLException ex) {
			ex.printStackTrace();
		} catch (IOException ex) {
			ex.printStackTrace();
		} finally {
			if (request != null) {
				try {
					request.disconnect();
				} catch (Exception ex) {
					ex.printStackTrace();
				}
			}
		}
		return null;
	}

If I use the GET method I get an error:
>java.net.ProtocolException: method does not support a request body: GET

I tried with POST but without success.

Thanks for your help.

I think you need to send a param along with this request

You can try this request in postman using this query

https://photoslibrary.googleapis.com/v1/mediaItems?pageSize=100

and pass the token in the authentication section.

Here you can do something like -

eg 
URI uri = new URIBuilder("https://photoslibrary.googleapis.com/v1/mediaItems")
.addParameter("pageSize", 100)
.build();

Suggestion - Use retrofit for network requests and jackson-databind project for JSON conversions.

I think the documentation is wrong and you're supposed to use a POST request instead of GET.

Also there is an error in the documented JSON request body: there is a trailing comma that should not be there. Use the following:

String body2 = "{\"pageSize\": \"100\"}";