goo.gle/debugproto
config {
  virtual_hosts {
    name: "regex"
    domains: "idle.lyft.com"
    routes {
      match {
        safe_regex {
          regex: "/regex"
        }
      }
      route {
        cluster: "some-cluster"
        internal_redirect_policy {
          redirect_response_codes: 301
          redirect_response_codes: 302
          redirect_response_codes: 303
          redirect_response_codes: 304
        }
      }
    }
  }
}
headers {
  headers {
    key: ":authority"
    value: "idle.lyft.com"
  }
  headers {
    key: ":path"
    value: "/regex"
  }
  headers {
    key: ":scheme"
    value: "https"
  }
  headers {
    key: "x-forwarded-proto"
    value: "https"
  }
  headers {
    key: "x-envoy-internal"
    value: "false"
  }
}
