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