base {
  config {
  }
  request_data {
    headers {
      headers {
        key: "overwrite-if-exists"
        value: "original-value"
      }
    }
  }
  response_data {
  }
}
response {
  status {
    code: 0
    message: "LGTM!"
  }
  ok_response {
    response_headers_to_add {
      header {
        key: "append-if-exists-or-add"
        value: "foo"
      }
      append_action: APPEND_IF_EXISTS_OR_ADD
    }
    response_headers_to_add {
      header {
        key: "add-if-absent"
        value: "foo"
      }
      append_action: ADD_IF_ABSENT
    }
    response_headers_to_add {
      header {
        key: "overwrite-if-exists-or-add"
        value: "foo"
      }
      append_action: OVERWRITE_IF_EXISTS_OR_ADD
    }
    response_headers_to_add {
      header {
        key: "overwrite-if-exists"
        value: "foo"
      }
      append_action: OVERWRITE_IF_EXISTS
    }
  }
}
