headers_to_add {
  header {
    key: " "
    value: "%UPSTREAM_METADATA([\"\313\253\313\256\313\256*\313\210])%"
  }
  append {
    value: true
  }
  keep_empty_value: true
}
headers_to_add {
  header {
    key: " "
    value: "%UPSTREAM_METADATA([\"\313\253\313\256\313\256*\313\210])%"
  }
  append {
    value: true
  }
  append_action: OVERWRITE_IF_EXISTS_OR_ADD
}
