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How to handle this error: java.io.IOException: Server returned HTTP response code: 503 for [closed]

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Closed 5 years ago .

How to handle this error: java.io.IOException: Server returned HTTP response code: 503 for

I wish that when gave this error, my code would repeat the request of url.

No is none this errors:

1) The server may be busy

2) The server may be down for maintenance

Code:

public Element trataDados(String address1) throws MalformedURLException, IOException, JDOMException {
    URL url;
    url = new URL(address1);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setRequestMethod("GET");
    InputStreamReader reader = new InputStreamReader(conn.getInputStream(), "UTF-8");
    BufferedReader bfreader = new BufferedReader(reader);
    StringBuilder stringBuilder = new StringBuilder();
    String line;
    while ((line = bfreader.readLine()) != null) {
        stringBuilder.append(line);
    bfreader.close();
    conn.disconnect();
Get the response code before you start reading the input. If it's 503, don't read the input, do read the error stream, and close it, and then retry, but not too soon. If the server is down for maintenance it could be for five seconds or five days. You should probably use an exponentially-increasing retry interval like TCP does, say doubling it every time, or multiplying by 1.5, up to some limit where you just give up.
NB GET is already the default.
    public Element trataDados(String address1) throws MalformedURLException, IOException, JDOMException {
        URL url;
        HttpURLConnection conn;
        url = new URL(address1);
        conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
//test out
        System.out.println("REQUEST: "+conn.getResponseCode());
        System.out.println("REQUEST: "+conn.getResponseMessage());
    }while(conn.getResponseCode()!= HttpURLConnection.HTTP_OK);
        InputStreamReader reader = new InputStreamReader(conn.getInputStream(), "UTF-8"); 
        BufferedReader bfreader = new BufferedReader(reader);
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        while ((line = bfreader.readLine()) != null) {
            stringBuilder.append(line);
        bfreader.close();
        conn.disconnect();
                That's a terrible solution. You are treating every response code other than 200 as though it can be retried; you aren't increasing the request interval (n fact you don't even have one); and you aren't limiting the number of retries. I wouldn't say this was 'based on [my] answer' at all..
– user207421
                Apr 18, 2018 at 23:26
                Hi @EJP, Actually I'm increasing the range of requests, but in another method that calls this, I'm using a sleep thread for that range; Already on the limit of the number of retries is not my intention, I want to force always have a valid request.
– kairos
                Apr 19, 2018 at 20:09