ajp connection from mod_jk hangs on EAP 7 if a post HTTP request header contains 'Transfer-Encoding: chunked'

Issue

• We use mod_jk to proxy to EAP 7. If a POST request contains Transfer-Encoding: chunked, the request never completes. The request thread on JBoss persists in a state trying to read the request body:

"default task-2@6414" prio=5 tid=0x3d nid=NA runnable
  java.lang.Thread.State: RUNNABLE
      at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Unknown Source:-1)
      at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source:-1)
      at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source:-1)
      at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source:-1)
      at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source:-1)
      - locked <0x194a> (a sun.nio.ch.WindowsSelectorImpl)
      - locked <0x194b> (a java.util.Collections$UnmodifiableSet)
      - locked <0x194c> (a sun.nio.ch.Util$2)
      at sun.nio.ch.SelectorImpl.select(Unknown Source:-1)
      at sun.nio.ch.SelectorImpl.select(Unknown Source:-1)
      at org.xnio.nio.SelectorUtils.await(SelectorUtils.java:46)
      at org.xnio.nio.NioSocketConduit.awaitReadable(NioSocketConduit.java:345)
      at org.xnio.conduits.AbstractSourceConduit.awaitReadable(AbstractSourceConduit.java:66)
      at io.undertow.conduits.ReadDataStreamSourceConduit.awaitReadable(ReadDataStreamSourceConduit.java:101)
      at io.undertow.server.protocol.ajp.AjpServerRequestConduit.awaitReadable(AjpServerRequestConduit.java:298)
      at org.xnio.conduits.ConduitStreamSourceChannel.awaitReadable(ConduitStreamSourceChannel.java:151)
      at io.undertow.channels.DetachableStreamSourceChannel.awaitReadable(DetachableStreamSourceChannel.java:77)
      at io.undertow.server.HttpServerExchange$ReadDispatchChannel.awaitReadable(HttpServerExchange.java:2092)
      at org.xnio.channels.Channels.readBlocking(Channels.java:295)
      at io.undertow.servlet.spec.ServletInputStreamImpl.readIntoBuffer(ServletInputStreamImpl.java:170)
      at io.undertow.servlet.spec.ServletInputStreamImpl.read(ServletInputStreamImpl.java:146)
      at io.undertow.servlet.spec.ServletInputStreamImpl.read(ServletInputStreamImpl.java:133)

• After a mod_jk connection serves a chunked POST request, the next request or ping attempt times out with no response from JBoss.