后端代码配置了跨域，前端仍然提示跨域失败

我在go项目中配置了cors中间件，但是前端请求人提示跨域问题，描述如下：

1	`The 'Access-Control-Allow-Origin' header contains multiple values 'http://xxxxxx, *', but only one is allowed.`

这是由于我配置了多次跨域配置，除了在代码中，我在nginx项目配置中找到了跨域配置，所以导致Origin出现两个值

代码配置如下：

return func(context *gin.Context) {
        method := context.Request.Method
        origin := context.Request.Header.Get("Origin")
        if len(origin) != 0 {
            context.Header("Access-Control-Allow-Origin", origin)
            context.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE, PATCH")
            context.Header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization")
            context.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Cache-Control, Content-Language, Content-Type")
            context.Header("Access-Control-Allow-Credentials", "true")
        }
 
        if method == "OPTIONS" {
            context.AbortWithStatus(http.StatusNoContent)
        }
        context.Next()
    }