YQLをjavaから呼ぶ

やっとjavaからYQLを呼ぶ。
Gsonには活躍してもらう。

URL中の空白（半角スペース）をURLエンコードせずに、実行すると

java.net.SocketException: Unexpected end of file from server
	at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
	at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
	at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
	at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
	at QuerySender.sendQuery(QuerySender.java:47)
	at QuerySender.main(QuerySender.java:19)

という例外が発生した。3時間悩んだよ。

NG…(%22AAPL%22, %20%22VTI%22)
OK…(%22AAPL%22,%20%22VTI%22)

public void sendQuery() {
	HttpURLConnection con = null;
	
	try {
		URL url = new URL("http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quotes%20where%20symbol%20in%20(%22AAPL%22,%20%22VTI%22)&format=json&env=store%3a%2f%2fdatatables.org%2falltableswithkeys");
		
		con = (HttpURLConnection) url.openConnection();
		
		con.setRequestMethod("GET");
		con.setInstanceFollowRedirects(false);
		con.setRequestProperty("Accept-Language", "ja,en-US;q=0.8,en;q=0.6");
		con.connect();
		
		try (BufferedReader reader = new BufferedReader(new InputStreamReader(con.getInputStream()));) {
			Gson gson = new Gson();
			Root root = gson.fromJson(reader, Root.class);
			
			for (Quote quote : root.getQuery().getResults().getQuote()) {
				System.out.println("symbol => " + quote.getSymbol() + ", Ask => " + quote.getAsk() + ", Bid => " + quote.getBid());
			}

		}
		
	} catch (MalformedURLException e) {
		e.printStackTrace();
	} catch (IOException e) {
		e.printStackTrace();
	} finally {
		con.disconnect();
	}
}