CORS問題が解決しない


フロントはTypescriptとVue3、サーバーサイドはgo言語を使って実装しています。  
フロントからサーバー側のAPIを叩いた際に以下のエラーが発生しており、サーバー側でCORSの設定を行ったんですが、こちらのエラーが解決しません。  
分かる方いますでしょうか？  
よろしくお願いいたします。

[code]

    Access to XMLHttpRequest at 'http://localhost:8080/api/price/?money_received=350000&bouns=1000000&fixed_cost=120000&loan=43000&private=55000' from origin 'http://localhost:4173' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
    
[/code]

go側のソースを張っておきます。

  * server/controllers/price_management_controllers.go

[code]

    // controllers/price_management_controllers.go
    package controllers
    
    import (
        "net/http"
        "server/common"
    
        "github.com/gin-gonic/gin"
    )
    
    type PriceInfo struct {
        LeftAmount  int `json:"left_amount"`
        TotalAmount int `json:"total_amount"`
    }
    
    type Response struct {
        PriceInfo PriceInfo `json:"result"`
    }
    
    func priceCalc(moneyReceived, bouns, fixedCost, loan, private int) PriceInfo {
    
        var priceinfo PriceInfo
        priceinfo.LeftAmount = moneyReceived - fixedCost - loan - private
        priceinfo.TotalAmount = (priceinfo.LeftAmount * 12) + bouns
    
        return priceinfo
    }
    
    func GetPriceInfo(c *gin.Context) {
        data, err := common.IntgetPrameter(c, "money_received", "bouns", "fixed_cost", "loan", "private")
    
        if err == nil {
            res := priceCalc(data["money_received"], data["bouns"], data["fixed_cost"], data["loan"], data["private"])
    
            response := Response{PriceInfo: res}
    
            c.JSON(http.StatusOK, gin.H{"message": response})
        } else {
            c.JSON(http.StatusOK, gin.H{"message": err})
        }
    
    }
    
    func CreateUser(c *gin.Context) {
        // ユーザーの作成ロジック
        c.JSON(http.StatusCreated, gin.H{"message": "User created"})
    }
    
    
[/code]

  * server/routes/routes.go

[code]

    // routes/routes.go
    package routes
    
    import (
        "server/controllers"
    
        "github.com/gin-gonic/gin"
    )
    
    func SetupRoutes(r *gin.Engine) {
        Routes := r.Group("/api")
        {
            Routes.GET("/price", controllers.GetPriceInfo)
            // Routes.POST("/", controllers.CreateUser)
        }
    }
    
    
[/code]

  * server/main.go

[code]

    // main.go
    package main
    
    import (
        "server/routes"
    
        "github.com/gin-contrib/cors" // corsミドルウェアのインポート
        "github.com/gin-gonic/gin"
    )
    
    func main() {
        r := gin.Default()
        // CORSミドルウェアを追加
        config := cors.DefaultConfig()
        config.AllowOrigins = []string{"*"}
        config.AllowMethods = []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"}
        r.Use(cors.New(config))
        routes.SetupRoutes(r)
        r.Run(":8080")
    }
    
    
[/code]

