JVM-based longpoll/comet client: routers killing idle connections?

Java.net. HttpURLConnection handles Keep-Alive header transparently it can be controlled and it is on by default. But your problem is not in Keep-Alive which is a higher level flag indicating that the server should close the connection after handling the first request but rather waiting for the next one.

There does not appear to be a way to turn on TCP keep-alive for HttpURLConnection.

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