Reverse dns resolution in CXF AsyncHTTPConduit for the proxy host address

Solution Verified - Updated -


  • When using the CXF Soap client (org.apache.cxf.jaxws.JaxWsProxyFactoryBean) provided with jboss Fuse and configured to use:
    • asynchronous http (AsyncHTTPConduit.USE_ASYNC set to TRUE),
    • an http proxy (IP and port is given)

from time to time we observe that the client thread is blocked during 5 seconds when initiating a SOAP call.

After some investigation, we have found out that this 5 seconds are lost in a DNS reverse-resolution of the given IP address of the http proxy. (The DNS resolution times out after 5 seconds)

This name reverse-resolution is made in org.apache.cxf.transport.http.asyncclient.AsyncHTTPConduit#setupConnection:

    Proxy p = this.proxyFactory.createProxy(csPolicy, uri);
    if(p != null && p.type() != Type.DIRECT) {
      InetSocketAddress isa = (InetSocketAddress)p.address();
      HttpHost proxy = new HttpHost(isa.getHostName(), isa.getPort());

The InetSocketAddress#getHostName call is where the reverse-resolution occurs as described in its javadoc.

  • What we expect:
    AsyncHTTPConduit should not do any DNS resolution on the http proxy IP.


  • Red Hat JBoss Fuse
    • 6.3.x
  • Apache CXF

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