COREDNS-HEADER(7)

🎀 NAME 🎀

header — modifies the header for queries and responses. This is the page for COREDNS-HEADER(7), bestie 💖

---

✨ DESCRIPTION ✨

Okay so header makes sure the flags are in the desired state for queries and responses. The modifications are made transparently for the client and subsequent plugins. No cap, it just quietly handles the vibes 😌✨

---

🌸 SYNTAX 🌸

              header {
                  SELECTOR ACTION FLAGS...
                  SELECTOR ACTION FLAGS...
              }

• SELECTOR — defines if the action should be applied on query or response.
• 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 — the DNS header flags that will be modified. Current supported flags include:
  • aa — Authoritative(Answer)
  • ra — RecursionAvailable
  • rd — RecursionDesired

Order matters, periodt 💅 actions are evaluated in the order they're defined, so the last one has the most precedence.

---

🔥 EXAMPLES 🔥

Make sure recursive available ra flag is set in all the responses:

              . {
                  header {
                      response set ra
                  }
              }

Make sure "recursion available" ra and "authoritative answer" aa flags are set and "recursion desired" is cleared in all responses:

              . {
                  header {
                      response set ra aa
                      response clear rd
                  }
              }

Make sure "recursion desired" rd is set for all subsequent plugins::

              . {
                  header {
                      query set rd
                  }
              }

---

Later, bestie 🫶 — this iconic page is from CoreDNS, dated March 2026, and it's COREDNS-HEADER(7). Bye 💅