Safe use of HttpURLConnection

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According to http://docs.oracle.com/javase/6/docs/technotes/guides/net/http-keepalive.html
and OpenJDK source code.

(When keepAlive == true)

If client called HttpURLConnection.getInputSteam().close(), the later call to HttpURLConnection.disconnect() will NOT close the Socket. i.e. The Socket is reused (cached)

If client does not call close(), call disconnect() will close the InputStream and close the Socket.

So in order to reuse the Socket, just call InputStream.close(). Do not call HttpURLConnection.disconnect().

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