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POHttpsUrlConnection and keep-alive
 

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    <p>I am using <code>com.sun.net.httpserver.HttpsServer</code> in my current project which deals with client-authentification etc.. Currently it only prints out the clients address/port, so that I can check if one TCP-connection is used for multiple requests (<code>keep-alive</code>) or if a new connection is established for every request (and thus a new SSL-handshake is made every time). When I use FireFox to make multiple request against the server I can see that keep-alive is working. So the server part works fine with GET and POST-requests.</p> <p>If I use <code>HttpURLConnection</code> to make a request against the Server (in this case using <strong>no</strong> SSL) <code>keep-alive</code> works, too: Only one connection is established for multiple sequentially started requests.</p> <p>But if I use <code>HttpsURLConnection</code> (using exactly the same code, but <strong>using</strong> SSL) then <code>keep-alive</code> is not working anymore. So for each request a new connection is established, although I am using the same <code>SSLContext</code> (and <code>SSLSocketFactory</code>):</p> <pre><code>// URL myUrl = ... // SSLContext mySsl = ... HttpsURLConnection conn = (HttpsURLConnection) myUrl.openConnection(); conn.setUseCaches(false); conn.setSSLSocketFactory(mySsl.getSocketFactory()); conn.setRequestMethod("POST"); // send Data // receive Data </code></pre> <p>How do I force <code>HttpsURLConnection</code> to use <code>keep-alive</code> because many requests will lead to many SSL-handshakes which is a real performance issue?</p> <p>Update (2012-04-02): Instead of calling <code>mySsl.getSocketFactory()</code> each time, I tried to cache the <code>SSLSocketFactory</code>. But nothing changed. The problem still exists.</p>
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    1. COHttpsURLConnection uses a service provider of sorts to determine the actual implementation of SSLSocketFactory to use. When running in some contexts (like an app server), different impls will be used. What jdk are you using in testing this? What sort of env?
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    2. COAlso, try setting `-Djava.net.debug=ssl` when running your code. Might provide additional information.
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    3. COThe code is running as a normal Java 7 application using Sun's JRE/JDK. I already have `-Djava.net.debug=ssl` set but couldn't see anything wrong. However I will check that again next time at work.
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