go初学者聊天机器人报错不知道怎么解决

package main

import (

	"bytes"

	"encoding/json"

	"fmt"

	"io/ioutil"

	"math/rand"

	"net/http"

)

type requestBody struct {

	Key    string `json:"key"`

	Info   string `json:"info"`

	UserId string `json:"userid"`

}

type responseBody struct {

	Code int      `json:"code"`

	Text string   `json:"text"`

	List []string `json:"list"`

	Url  string   `json:"url"`

}

func process(inputChan <-chan string, userid string) {

	for {

		input := <-inputChan

		if input == "EOF" {

			break

		}

		reqData := &requestBody{

			Key:    "792bcf45156d488c92e9d11da494b085",

			Info:   input,

			UserId: userid,

		}

		byteData := json.Marshal(&reqData)

		req, err := http.NewRequest("POST",

			"http://www.tuling123.com/openapi/api",

			bytes.NewReader(byteData))

		req.Header.Set("Content-Type", "application/json;charset=UTF-8")

		client := http.Client{}

		resp, err := client.Do(req)

		if err != nil {

			fmt.Println("Network Error!", err)

		} else {

			body, _ := ioutil.ReadAll(resp.Body)

			var respData responseBody

			json.Unmarshal(body, &respData)

			fmt.Println("AI: " + respData.Text)

		}

		if resp != nil {

			resp.Body.Close()

		}

	}

func main(){

	var input string

	fmt.Println("Enter 'EOF' to shut down: ")

	channel := make(chan string)

	defer close(channel)

	go process(channel, string(rand.Int63()))

	for {

		fmt.Scanf("%s", &input1)

		channel <- input

		if input == "EOF" {

			fmt.Println("Bye!")

			break

		}

	}

}