go web 预防跨站脚本的实现方式

package main
 
import (
   "fmt"
   "html/template"
   "log"
   "net/http"
)
 
// 登录逻辑
func login(w http.ResponseWriter, r *http.Request) {
   fmt.Println("method:", r.Method) // 获取请求的方法
   if r.Method == "GET" {
      t, _ := template.ParseFiles("src\\goweb\\demo3\\login.html") // 解析模板
      t.Execute(w, nil)                                            // 渲染模板，并发送给前端
   } else {
      // 请求的是登陆数据，那么执行登陆的逻辑判断
      // 解析表单
      r.ParseForm()
      fmt.Println("username:", r.Form["username"])
      fmt.Println("password:", r.Form["password"])
      template.HTMLEscape(w, []byte(r.Form.Get("username"))) //输出到客户端
   }
}
 
func main() {
   http.HandleFunc("/login", login)         // 设置访问的路由
   err := http.ListenAndServe(":9090", nil) // 设置监听的端口
   if err != nil {
      log.Fatal("ListenAndServe: ", err)
   }
}

package main
 
import (
   "log"
   "net/http"
   "text/template"
)
 
// 转义测试
func escape(w http.ResponseWriter, r *http.Request) {
   // 正常显示
   t, _ := template.New("foo").Parse(`{{define "T"}}Hello1, {{.}}!{{end}}`)
   t.ExecuteTemplate(w, "T", "<script>alert('you have been pwned')</script>")
}
 
func main() {
   http.HandleFunc("/escape", escape)       // 设置转义
   err := http.ListenAndServe(":9090", nil) // 设置监听的端口
   if err != nil {
      log.Fatal("ListenAndServe: ", err)
   }
}

package main
 
import (
   "html/template"
   "log"
   "net/http"
)
 
// 转义测试
func escape(w http.ResponseWriter, r *http.Request) {
   // 转义显示
   t, _ := template.New("foo").Parse(`{{define "T"}}Hello1, {{.}}!{{end}}`)
   t.ExecuteTemplate(w, "T", "<script>alert('you have been pwned')</script>")
    // 正常显示
   t, _ = template.New("foo").Parse(`{{define "T"}}Hello2, {{.}}!{{end}}`)
   t.ExecuteTemplate(w, "T", template.HTML("<script>alert('you have been pwned')</script>"))
}
 
func main() {
   http.HandleFunc("/escape", escape)       // 设置转义
   err := http.ListenAndServe(":9090", nil) // 设置监听的端口
   if err != nil {
      log.Fatal("ListenAndServe: ", err)
   }
}