错误写法
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func main() { openHttpListen()}func openHttpListen() { http.HandleFunc("/", receiveClientRequest) fmt.Println("go server start running...") err := http.ListenAndServe(":9090", nil) if err != nil { log.Fatal("ListenAndServe: ", err) }}func receiveClientRequest(w http.ResponseWriter, r *http.Request) { w.Header().Set("Access-Control-Allow-Origin", "*") //允许访问所有域 w.Header().Add("Access-Control-Allow-Headers", "Content-Type") //header的类型 w.Header().Set("content-type", "application/json") //返回数据格式是json r.ParseForm() fmt.Println("收到客户端请求: ", r.Form) |
这样还是会报错：
说没有得到响应跨域的头，chrome的network中确实没有响应Access-Control-Allow-Origin
正确写法：
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func LDNS(w http.ResponseWriter, req *http.Request) { if origin := req.Header.Get("Origin"); origin != "" { w.Header().Set("Access-Control-Allow-Origin", origin) w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE") w.Header().Set("Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization") } if req.Method == "OPTIONS" { return } // 响应http code w.WriteHeader(200) query := strings.Split(req.Host, ".") value, err := ldns.RAMDBMgr.Get(query[0]) fmt.Println("Access-Control-Allow-Origin", "*") if err != nil { io.WriteString(w, `{"message": ""}`) return } io.WriteString(w, value)} |
补充：go http允许跨域
1.创建中间件
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import ( "github.com/gin-gonic/gin" "net/http")// 跨域中间件func Cors() gin.HandlerFunc { return func(c *gin.Context) { method := c.Request.Method origin := c.Request.Header.Get("Origin") if origin != "" { c.Header("Access-Control-Allow-Origin", origin) c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE") c.Header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization") c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Cache-Control, Content-Language, Content-Type") c.Header("Access-Control-Allow-Credentials", "false") c.Set("content-type", "application/json") } if method == "OPTIONS" { c.AbortWithStatus(http.StatusNoContent) } c.Next() }} |
2.在route中引用中间件
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router := gin.Default()// 要在路由组之前全局使用「跨域中间件」, 否则OPTIONS会返回404router.Use(Cors()) |
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/guoer9973/article/details/54341637
