// TODO: response headers?
		_, f := r.RequestHeaders[http.CanonicalHeaderKey("X-Request-Id")]
		if !f {
			return fmt.Errorf("X-Request-Id not set, is L7 processing enabled?")
		}
		return nil
	})
}

func IsL4() echo.Checker {
	return check.Each(func(r echot.Response) error {
		// TODO: response headers?
		_, f := r.RequestHeaders[http.CanonicalHeaderKey("X-Request-Id")]
		if f {

								Value: "literal-value",
							},
						},
					},
					{
						Tag: "custom_tag_request_header",
						Type: &tracing.CustomTag_RequestHeader{
							RequestHeader: &tracing.CustomTag_Header{
								Name:         "custom_tag_request_header_name",
								DefaultValue: "custom-defaulted-value-request-header",
							},
						},
					},
				}, customTracingTags()...),