当请求由浏览器直接发起请求到服务器中间没有经过代理转发的话,则可以采用如下代码获取协议,域名等参数。如果经过了转发则只能由代理服务如HA或者nginx把域名和协议写在请求头里转发到后端服务,然后通过读取请求头参数r.Header.Get()来获取。
package main
import (
"fmt"
"net/http"
)
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Printf("%s\n", r.URL.RequestURI())
fmt.Printf("%v\n", r.Proto)
fmt.Printf("%v\n", r.Host)
fmt.Printf("%v\n", r.UserAgent())
fmt.Printf("%v\n", r.URL.Query().Get("mz_id"))
w.Write([]byte("hello"))
}
func main() {
http.HandleFunc("/", handler)
http.ListenAndServe(":8080", nil)
}
/mz?mz_id=ABCDEEFDAAS
HTTP/1.1
pub.example.com:8080
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:62.0) Gecko/20100101 Firefox/62.0
ABCDEEFDAAS