code: func (c *Controller) HeaderExample(ctx *gin.Context) {
  	ctx.String(http.StatusOK, ctx.GetHeader("Authorization"))
  }
docs: // HeaderExample godoc
  // @Summary custome header example
  // @Description custome header
  // @Tags example
  // @Accept json
  // @Produce json
  // @Param Authorization header string true "Authentication header"
  // @Success 200 {string} string "answer"
  // @Failure 400 {string} string "ok"
  // @Failure 404 {string} string "ok"
  // @Failure 500 {string} string "ok"
  // @Router /examples/header [get]