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coredns/plugin/header/README.md
Qasim Sarfraz 00128bda4e plugin/header: Introduce header plugin (#4752)
* Add header plugin

Signed-off-by: MQasimSarfraz <syed.qasim.sarfraz@gmail.com>

* fix import format

* improve README.md

* Add codeowners for header plugin
2021-07-15 09:32:39 +02:00

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# header
## Name
*header* - modifies the header for all the responses.
## Description
It ensures that the flags are in the desired state for all the responses. The modifications are made transparently for
the client.
## Syntax
~~~
header {
ACTION FLAGS...
ACTION FLAGS...
}
~~~
* **ACTION** defines the state for dns 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 flags that will be modified. Current supported flags include:
* `aa` - Authoritative
* `ra` - RecursionAvailable
* `rd` - RecursionDesired
## Examples
Make sure recursive available `ra` flag is set in all the responses:
~~~ corefile
. {
header {
set ra
}
}
~~~
Make sure recursive available `ra` and authoritative `aa` flags are set and recursive desired is cleared in all the
responses:
~~~ corefile
. {
header {
set ra aa
clear rd
}
}
~~~