According to this bug https://issues.apache.org/bugzilla/show_bug.cgi?id=39658 an the mod_jk documentation, ssl_key_size attribute is passed as an integer.
Winstone parses it as a string and generates a stack trace.

Steps to reproduce:
1. Start jenkins in standalone mode with AJP activated on some port
2. Setup a reverse proxy on apache on a virtualhost which has ssl configured
3. navigate to https://rproxy.address/jenkins

Results

• Apache returns an "Internal error"
• /var/log/jenkins/jenkins.log is filled with EOFException stack such as this one
  java.io.EOFException
  at java.io.DataInputStream.readFully(DataInputStream.java:197)
  at java.io.DataInputStream.readFully(DataInputStream.java:169)
  at winstone.ajp13.Ajp13IncomingPacket.readString(Ajp13IncomingPacket.java:244)
  at winstone.ajp13.Ajp13IncomingPacket.readString(Ajp13IncomingPacket.java:231)
  at winstone.ajp13.Ajp13IncomingPacket.parsePacket(Ajp13IncomingPacket.java:168)
  at winstone.ajp13.Ajp13Listener.allocateRequestResponse(Ajp13Listener.java:184)
  at winstone.RequestHandlerThread.run(RequestHandlerThread.java:67)
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
  at java.util.concurrent.FutureTask.run(FutureTask.java:166)
  at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
  at java.lang.Thread.run(Thread.java:636)

Expected behaviour:
A jenkins page, like when using http