37

我正在使用 Go gin 框架gin

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()
        }
    }
}

我有状态代码：200 OK，但是在 OPTIONS 请求之后什么也没有发生。看起来我错过了什么，但我不明白我错在哪里。

有谁能够帮助我？

4

7 回答 7

68

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()
    }
}
于 2015-04-03T21:01:36.793 回答
19

还有官方 gin 的中间件用于处理 CORS 请求github.com/gin-contrib/cors。

您可以使用安装它$ go get github.com/gin-contrib/cors，然后在您的应用程序中添加这个中间件，如下所示：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()
}
于 2018-02-13T09:31:50.037 回答
6 
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())
于 2020-09-09T11:58:38.270 回答
3

我们创建了一个最小的中间件。

import (
    "github.com/gin-gonic/gin"
    "net/http"
)

type optionsMiddleware struct {

}

func CreateOptionsMiddleware() *optionsMiddleware{
    return &optionsMiddleware{}
}

func (middleware *optionsMiddleware)Response(context *gin.Context){
    if context.Request.Method == "OPTIONS" {
        context.AbortWithStatus(http.StatusNoContent)
    }
}

并将其注册到 gin 中间件：

app  := gin.New()
app.Use(middleware.CreateOptionsMiddleware().Response).
    Use(next-middleware)......
于 2017-11-13T17:51:36.497 回答
2

有包https://github.com/rs/cors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")
}

通常情况下，您只需将默认处理添加router.Use(cors.Default())到您的中间件中gin。就够了。

于 2019-02-21T08:09:47.600 回答
2

我花了大约一个小时来了解为什么互联网上的某些示例有效，而有些则无效。所以我得到了区别 - 行顺序很重要，首先你应该使用 config 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")
于 2021-10-24T14:08:22.300 回答
1

这对我有用 - 注意：直接设置标题。

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

        c.Header("Access-Control-Allow-Origin", "*")
        c.Header("Access-Control-Allow-Headers", "*")
        /*
            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", "access-control-allow-origin, access-control-allow-headers")
            c.Writer.Header().Set("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT, DELETE, OPTIONS, PATCH")
        */

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

        c.Next()
    }
}
于 2020-11-27T06:09:20.673 回答