request_headers_to_add

config.route.v3.VirtualHostの下に書く

複数書きたいときは以下のように書く

response_headers_to_add:
  - header:
      key: "x-frame-options"
      value: "sameorigin"
  - header:
      key: "x-xss-protection"
      value: "1; mode=block"

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