我有一个运行在localhost：8090上的服务器，我从运行在localhost：3000上的React应用程序向其发出请求。此请求的目的是执行一些操作，完成后，它将从后端重定向到https://www.google.com/。
前端：

function processReq() {
  fetch(`http://localhost:8090/some-process`,
    {
      method: "GET",
      headers: {
        Accept: "application/json",
      }
    }
  )
  .then(response => {
      console.log(response);
    }).catch(err => console.log(err))
}

后端

r.GET("/some-process", handlers.DoProcess)

func DoProcess(c *gin.Context) {

    // processes request
    var w http.ResponseWriter = c.Writer

    http.Redirect(w, c.Request, "https://www.google.com", http.StatusSeeOther)
}

所有这些都运行良好，但是我得到了一个如下所示的Cors错误

Access to fetch at 'https://www.google.com/' (redirected from 'http://localhost:8090/some-process') from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

请注意，我在后端安装了cors，它看起来像这样

func CORS() gin.HandlerFunc {
    return func(c *gin.Context) {
        c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
        c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
        c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, Accept, Origin, Cache-Control, X-Requested-With")
        c.Writer.Header().Set("Access-Control-Allow-Methods", "*")

        if c.Request.Method == "OPTIONS" {
            c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
            c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
            c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, Accept, Origin, Cache-Control, X-Requested-With")
            c.Writer.Header().Set("Access-Control-Allow-Methods", "*")
            c.AbortWithStatus(204)
            return
        }

        c.Next()
    }
}```