Camel undertow does not give an option to change the "Host" header when calling another HTTP endpoint.

Issue

• If two HTTP services are proxied using camel undertow, it always keeps the Host header received from the first service and does not allow to change it. This can be problematic in situations where the target service validates the Host header.
• Camel undertow always propagates the same host header from source to target. There is no option to disable this.

<route>
            <from uri="undertow:http://localhost:8189"/>
            <log message="Source ${in.headers.Host}" />
            <to uri="undertow:http://localhost:8289"/>
        </route>
        <route>
            <from uri="undertow:http://localhost:8289"/>
            <log message="Target ${in.headers.Host}" />
        </route>

Result:

2019-11-05 12:43:54.738  INFO 30967 --- [  XNIO-2 task-1] route1 :  Source localhost:8189
2019-11-05 12:43:54.789  INFO 30967 --- [  XNIO-3 task-1] route2 :  Target localhost:8189

Expected:

2019-11-05 12:43:54.738  INFO 30967 --- [  XNIO-2 task-1] route1 :  Source localhost:8189
2019-11-05 12:43:54.789  INFO 30967 --- [  XNIO-3 task-1] route2 :  Target localhost:8289