I re-wrote and re-enabled the custom warmup servlet recently, and found it really works like charming

[Tapir]

Sorry, maybe I didn't get it before. But I really think the docs for
custom warmup servlet is not perfect.

The new code:

public void service(ServletRequest req, ServletResponse resp)
throws ServletException, IOException {
try {
URL url = new URL("/about?from=warmup");
HttpURLConnection connection = (HttpURLConnection)
url.openConnection();
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/
octet-stream");

DataOutputStream outSteam = new DataOutputStream (new
BufferedOutputStream (connection.getOutputStream()));

byte[] keyBytes = "warmup".getBytes ("UTF-8");
outSteam.write (keyBytes, 0, keyBytes.length);
outSteam.flush ();
outSteam.close ();

connection.getResponseCode();
} catch (Exception e) {
}
}

And the old code:

public void service(ServletRequest req, ServletResponse resp)
throws ServletException, IOException {
try {
Queue queue = QueueFactory.getDefaultQueue();
queue.add(TaskOptions.Builder.withUrl("/
about").param("from", "warmup").method(Method.GET));
} catch (Exception e) {
}
}

[Jeff Schnitzer]

This seems a very roundabout approach. Why not just use
/about?from=warmup as the warmup url?

FWIW, I don't think there is any ambiguity in the docs. When the
warmup request returns, GAE thinks your app is initialized. If you
spawn a task to make the actual work asynchronous, of course that
isn't going to work!

Jeff

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