The "normal" CXF/JAX-WS method of setting user credentials via the BindingProvider.USERNAME_PROPERTY/PASSWORD_PROPERTY will work with the Async transport as well. However, the HttpAsyncClient library does have some additional capabilities around NTLM that can be leveraged. In order to use that, you need to:
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Turn on the AutoRedirect and turn off the Chunking for the Conduit. This will allow CXF to cache the response in a manner that will allow the transport to keep resending the request during the authentication negotiation.
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Force the use of the Async transport even for synchronous calls
bp.getRequestContext().put("use.async.http.conduit", Boolean.TRUE); -
Set the property "org.apache.http.auth.Credentials" to an instance of the Credentials. For example:
Credentials creds = new NTCredentials("username", "pswd", null, "domain"); bp.getRequestContext().put(Credentials.class.getName(), creds);