디버깅 및 문제 해결을 위해 Gin에서 HTTP 응답 본문을 어떻게 기록할 수 있나요?

type bodyLogWriter struct {
    gin.ResponseWriter
    body *bytes.Buffer
}

func (w bodyLogWriter) Write(b []byte) (int, error) {
    w.body.Write(b)
    return w.ResponseWriter.Write(b)
}

func ginBodyLogMiddleware(c *gin.Context) {
    blw := &bodyLogWriter{body: bytes.NewBufferString(""), ResponseWriter: c.Writer}
    c.Writer = blw
    c.Next()
    statusCode := c.Writer.Status()
    if statusCode >= 400 {
        fmt.Println("Response body: " + blw.body.String())
    }
}

router := gin.New()
router.Use(ginBodyLogMiddleware)

type bodyLogHandler struct {
    wrappedHandler http.Handler
}

func (h *bodyLogHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    blw := &bodyLogWriter{body: bytes.NewBufferString(""), ResponseWriter: w}
    h.wrappedHandler.ServeHTTP(blw, r)
    statusCode := blw.Status()
    if statusCode >= 400 {
        fmt.Println("Response body: " + blw.body.String())
    }
}

http.ListenAndServe(bindAddress, &bodyLogHandler{wrappedHandler: ginRouter})