httptracex

type Handler interface {
	// DNSStart is called when we start name resolution.
	DNSStart(host string)

	// DNSDone is called after name resolution.
	DNSDone(addrs []net.IPAddr, err error)

	// ConnectStart is called when we start connecting.
	ConnectStart(network, addr string)

	// ConnectDone is called after connect.
	ConnectDone(network, addr string, err error)

	// TLSHandshakeStart is called when we start the TLS handshake.
	TLSHandshakeStart()

	// TLSHandshakeDone is called after the TLS handshake.
	TLSHandshakeDone(state tls.ConnectionState, err error)

	// ConnectionReady is called when a connection is ready to be used.
	ConnectionReady(conn net.Conn)

	// WroteHeaderField is called when a header field is written.
	WroteHeaderField(key string, values []string)

	// WroteHeaders is called when all headers are written.
	WroteHeaders(request *http.Request)

	// WroteRequest is called after the request has been written.
	WroteRequest(err error)

	// GotFirstResponseByte is called when we start reading the response.
	GotFirstResponseByte()

	// GotHeaders is called when we've got the response headers.
	GotHeaders(response *http.Response)
}

type Measurer struct {
	// RoundTripper is the child http.RoundTripper.
	http.RoundTripper

	// Handler is the event handler
	Handler Handler
}