Right, so just to be clear, to treat it as optional it should be like this:

Map<String, Object> headers = exchange.getIn().getHeaders();
//headers.put("dns.server", null);
//headers.put("dns.server", ResolverConfig.getCurrentConfig().server());
headers.put("dns.class", "");
headers.put("dns.name", "www.example.com");
headers.put("dns.type", "TXT");

On Sun, Oct 6, 2013 at 6:50 PM, kuro <962...@gmail.com> wrote:
> Yes !
>
>
>
>
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