I found a bug in DnsDigEndpoint class.
I cannot set the value of "dns.server" to null.
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");
ProducerTemplate p = context.createProducerTemplate();
Exchange respExchange = p.send("dns://dig", exchange);
version: Apache camel 2.12.1
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