config {
  grpc_service {
    envoy_grpc {
      cluster_name: "ext_proc_server"
    }
  }
  processing_mode {
    request_header_mode: SEND
  }
}
request_data {
  headers {
    headers {
      key: ":host"
      value: "example.com"
    }
    headers {
      key: ":method"
      value: "GET"
    }
    headers {
      key: ":path"
      value: "/users"
    }
    headers {
      key: ":scheme"
      value: "https"
    }
  }
  http_body {
    data: "foobarbaz"
  }
}