解决golang gin框架跨域及注解的问题

时间:2022-11-01 14:26:40

golang的路上缓慢前进 Gin框架 跨域问题的解说与方法

代码如下:

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package main
import (
    "github.com/gin-gonic/gin"
    "awesomeProject/app/app_routers"
    "strings"
    "fmt"
    "net/http"
)
 
/* 路由初始化*/
var (
    engine = gin.Default()
)
func main() {
 
    // 允许使用跨域请求  全局中间件
    engine.Use(Cors())
    //router.Use(cors.Default())
    // 传参 设定路由组 允许路由组使用路由
    app_routers.Router(engine)
    // 启动路由 设定端口
    Cors()
    engine.Run(":11000")    //运行启动端口
}
//
// 跨域
func Cors() gin.HandlerFunc {
    return func(c *gin.Context) {
        method := c.Request.Method      //请求方法
        origin := c.Request.Header.Get("Origin")        //请求头部
        var headerKeys []string                             // 声明请求头keys
        for k, _ := range c.Request.Header {
            headerKeys = append(headerKeys, k)
        }
        headerStr := strings.Join(headerKeys, ", ")
        if headerStr != "" {
            headerStr = fmt.Sprintf("access-control-allow-origin, access-control-allow-headers, %s", headerStr)
        } else {
            headerStr = "access-control-allow-origin, access-control-allow-headers"
        }
        if origin != "" {
            c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
            c.Header("Access-Control-Allow-Origin", "*")        // 这是允许访问所有域
            c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE,UPDATE")      //服务器支持的所有跨域请求的方法,为了避免浏览次请求的多次'预检'请求
            // header的类型
            c.Header("Access-Control-Allow-Headers", "Authorization, Content-Length, X-CSRF-Token, Token,session,X_Requested_With,Accept, Origin, Host, Connection, Accept-Encoding, Accept-Language,DNT, X-CustomHeader, Keep-Alive, User-Agent, X-Requested-With, If-Modified-Since, Cache-Control, Content-Type, Pragma")
            //              允许跨域设置                                                                                                      可以返回其他子段
            c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers,Cache-Control,Content-Language,Content-Type,Expires,Last-Modified,Pragma,FooBar")      // 跨域关键设置 让浏览器可以解析
            c.Header("Access-Control-Max-Age", "172800")        // 缓存请求信息 单位为秒
            c.Header("Access-Control-Allow-Credentials", "false")       //  跨域请求是否需要带cookie信息 默认设置为true
            c.Set("content-type", "application/json")       // 设置返回格式是json
        }
 
        //放行所有OPTIONS方法
        if method == "OPTIONS" {
            c.JSON(http.StatusOK, "Options Request!")
        }
        // 处理请求
        c.Next()        //  处理请求
    }
}

补充:gin框架中间件解决跨域问题

代码如下:

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func Cors(c *gin.Context) {
 c.Header("Access-Control-Allow-Origin", "*")
 c.Header("Access-Control-Allow-Headers", "Content-Type,AccessToken,X-CSRF-Token, Authorization, Token")
 c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, PATCH, DELETE")
 c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Content-Type")
 c.Header("Access-Control-Allow-Credentials", "true")
 //这里是解决vue那个坑
 method := c.Request.Method
 // 放行所有OPTIONS方法,因为有的模板是要请求两次的
 if method == "OPTIONS" {
  c.AbortWithStatus(http.StatusNoContent)
 }
 // 处理请求
 c.Next()
}

以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。如有错误或未考虑完全的地方,望不吝赐教。

原文链接:https://blog.csdn.net/Chelydra/article/details/79884861