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# header
## Name
*header* - modifies the header for queries and responses.
## Description
*header* ensures that the flags are in the desired state for queries and responses.
The modifications are made transparently for the client and subsequent plugins.
## Syntax
~~~
header {
[SELECTOR] ACTION FLAGS...
[SELECTOR] ACTION FLAGS...
}
~~~
* **SELECTOR** defines if the action should be applied on `query` or `response`. In future CoreDNS version the selector will be mandatory. For backwards compatibility the action will be applied on `response` if the selector is undefined.
* **ACTION** defines the state for DNS message header flags. Actions are evaluated in the order they are defined so last one has the
most precedence. Allowed values are:
* `set`
* `clear`
* **FLAGS** are the DNS header flags that will be modified. Current supported flags include:
* `aa` - Authoritative(Answer)
* `ra` - RecursionAvailable
* `rd` - RecursionDesired
## Examples
Make sure recursive available `ra` flag is set in all the responses:
~~~ corefile
. {
header {
response set ra
}
}
~~~
Make sure "recursion available" `ra` and "authoritative answer" `aa` flags are set and "recursion desired" is cleared in all responses:
~~~ corefile
. {
header {
response set ra aa
response clear rd
}
}
~~~
Make sure "recursion desired" `rd` is set for all subsequent plugins::
~~~ corefile
. {
header {
query set rd
}
}
~~~
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