去杜松子酒框架CORS

Question

我正在使用Go gin框架杜松子酒

func CORSMiddleware() gin.HandlerFunc {
    return func(c *gin.Context) {
        c.Writer.Header().Set("Content-Type", "application/json")
        c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
        c.Writer.Header().Set("Access-Control-Max-Age", "86400")
        c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE")
        c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, X-Max")
        c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")

        if c.Request.Method == "OPTIONS" {
            c.AbortWithStatus(200)
        } else {
            c.Next()
        }
    }
}

我有状态码:200 OK,但OPTIONS请求后没有任何反应.看起来我想念一些东西,但我无法理解我错在哪里.

有谁能够帮我？

Answer 1

FWIW,这是我的CORS中间件,可以满足我的需求.

func CORSMiddleware() 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", "POST, OPTIONS, GET, PUT")

        if c.Request.Method == "OPTIONS" {
            c.AbortWithStatus(204)
            return
        }

        c.Next()
    }
}

Answer 2

我花了大约一个小时来了解为什么互联网上的一些示例有效，而有些则无效。所以我明白了区别 - 行顺序很重要，首先你应该使用配置，然后声明你的端点，但不是相反的方式。

作品：

router := gin.Default()
router.Use(cors.Default())
router.GET("/ping", pong)
router.Run(":8082")

不起作用：

router := gin.Default()
router.GET("/ping", pong)
router.Use(cors.Default())
router.Run(":8082")

Answer 3

有一个包https://github.com/rs/cors，可以以正确的方式处理 CORS 请求。它具有流行路由器的示例，包括gin. 那它：

package main

import (
    "net/http"

    "github.com/gin-gonic/gin"
    cors "github.com/rs/cors/wrapper/gin"
)

func main() {
    router := gin.Default()

    router.Use(cors.Default())
    router.GET("/", func(context *gin.Context) {
        context.JSON(http.StatusOK, gin.H{"hello": "world"})
    })

    router.Run(":8080")
}

在常见情况下，您只需将默认处理添加router.Use(cors.Default())到gin. 这就足够了。

Answer 4

还有官方的杜松子酒的中间件来处理CORS请求github.com/gin-contrib/cors。

您可以使用安装它$ go get github.com/gin-contrib/cors，然后像下面这样在您的应用程序中添加此中间件：package main

import (
    "time"

    "github.com/gin-contrib/cors"
    "github.com/gin-gonic/gin"
)

func main() {
    router := gin.Default()
    // CORS for https://foo.com and https://github.com origins, allowing:
    // - PUT and PATCH methods
    // - Origin header
    // - Credentials share
    // - Preflight requests cached for 12 hours
    router.Use(cors.New(cors.Config{
        AllowOrigins:     []string{"https://foo.com"},
        AllowMethods:     []string{"PUT", "PATCH"},
        AllowHeaders:     []string{"Origin"},
        ExposeHeaders:    []string{"Content-Length"},
        AllowCredentials: true,
        AllowOriginFunc: func(origin string) bool {
            return origin == "https://github.com"
        },
        MaxAge: 12 * time.Hour,
    }))
    router.Run()
}

Answer 5

func CORSMiddleware() gin.HandlerFunc {
    return func(c *gin.Context) {

        c.Header("Access-Control-Allow-Origin", "*")
        c.Header("Access-Control-Allow-Credentials", "true")
        c.Header("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With")
        c.Header("Access-Control-Allow-Methods", "POST,HEAD,PATCH, OPTIONS, GET, PUT")

        if c.Request.Method == "OPTIONS" {
            c.AbortWithStatus(204)
            return
        }

        c.Next()
    }
}

然后使用它

router = gin.New()  
router.Use(CORSMiddleware())