// signature requests (see RFC 2986):

type tbsCertificateRequest struct {
	Raw           asn1.RawContent
	Version       int
	Subject       asn1.RawValue
	PublicKey     publicKeyInfo
	RawAttributes []asn1.RawValue `asn1:"tag:0"`
}

type certificateRequest struct {
	Raw                asn1.RawContent
	TBSCSR             tbsCertificateRequest
	SignatureAlgorithm pkix.AlgorithmIdentifier

				Message:              "This is a test TCP message",
				ProxyProtocolVersion: 1,
				Check: check.Each(
					func(r echoClient.Response) error {
						body := r.RawContent
						ok := strings.Contains(body, "PROXY TCP4")
						if ok {
							return fmt.Errorf("sent proxy protocol header, and it was echoed back")
						}
						return nil
					}),
			},
		})
	}