headers {
  headers {
    key: ":method"
    value: "GET"
  }
  headers {
    key: ":path"
    value: "/"
  }
  headers {
    key: ":scheme"
    value: "http"
  }
  headers {
    key: ":host"
    value: "foo"
  }
  headers {
    key: "x-envoy"
    value: "one_value"
  }
  headers {
    key: "x-envoy"
    value: "another"
  }
  headers {
    key: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
    value: "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
  }
}