Question

I use the following lines to get a web page from GAE, but it takes a long time, how to raise the timeout limit ?

try
{
  URL url=new URL(Url + "?r=" + System.currentTimeMillis());
  BufferedReader reader = new BufferedReader(
                          new InputStreamReader(url.openStream()));

  while ((line=reader.readLine())!=null) { Result += line + "\n"; }
  reader.close();
}
catch (MalformedURLException e) { ... }
catch (IOException e) { ... }

Answer 1

GAE/J offers two APIs:

Option 1. The java.net API, where you can use the URLConnection (or HttpURLConnection) class:

URLConnection conn = url.openConnection();
conn.setConnectTimeout(timeoutMs);
conn.setReadTimeout(timeoutMs);

Option 2. The GAE Low Level API offers a FetchOptions#setDeadline method to set the deadline for the fetch request.

As a third alternative, you could also use a specific library such as HttpClient, but you would have to check if that library works with the inherent limitations of GAE/J.

HttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams, connectionTimeoutMillis);
HttpConnectionParams.setSoTimeout(httpParams, socketTimeoutMillis);
HttpClient httpClient = new DefaultHttpClient(httpParams);