golang 获取get参数

package main

import (
	"log"
	"net/http"
)

func main() {
	http.HandleFunc("/", handler)
	http.ListenAndServe(":8081", nil)
}

func handler(w http.ResponseWriter, r *http.Request) {

	keys, ok := r.URL.Query()["key"]

	if !ok || len(keys) < 1 {
		log.Println("Url Param 'key' is missing")
		return
	}

	// Query()["key"] will return an array of items,
	// we only want the single item.
	key := keys[0]

	log.Println("Url Param 'key' is: " + string(key))
}