package main

                                        import (
                                            "encoding/json"
                                            "encoding/xml"
                                            "fmt"
                                            "io/ioutil"
                                            "net/http"
                                        )

                                        const (
                                            URL   = "https://api.ip138.com/express/info"
                                            TOKEN = "bd4c2bf9a38ab06f7cae88c9759ee172"
                                        )

                                        //----------------------------------
                                        // 调用示例代码
                                        //----------------------------------
                                        //json struct
                                        type jsoninfo struct {
                                            Status  string    `json:"status"`
                                            code    string    `json:"code"`
                                            Data    string    `json:"data"`
                                        }

                                        func main() {
                                            getExpress("100613574827")
                                        }

                                        func getExpress(no string) {
                                            queryUrl := fmt.Sprintf("%s?no=%s",URL,no)
                                            client := &http.Client{}
                                            reqest, err := http.NewRequest("GET",queryUrl,nil)

                                            if err != nil {
                                                fmt.Println("Fatal error ",err.Error())
                                            }

                                            reqest.Header.Add("token",TOKEN)
                                            response, err := client.Do(reqest)
                                            defer response.Body.Close()

                                            if err != nil {
                                                fmt.Println("Fatal error ",err.Error())
                                            }
                                            if response.StatusCode == 200 {
                                                bodyByte, _ := ioutil.ReadAll(response.Body)
                                                var info jsoninfo
                                                json.Unmarshal(bodyByte,&info)
                                            }

                                            return
                                        }