写了http服务把参数转换成json并base64,我只打印了一行，但输出的时候输出两行

Question

写了http服务把参数转换成json并base64,但输出的时候输出两行，但我只打印了一行。奇怪。

    package main
    
    import (
        "bytes"
        b64 "encoding/base64"
        "encoding/json"
        "fmt"
        "strings"
        //    "log"
        "net/http"
    )
    
    type data struct {
        TemplateId        int        `json:"templateId"`
        MobileNum         []string   `json:"mobileNum"`
        ClientIp          string     `json:"clientIp"`
        SystemId          int        `json:"systemId"`
        SmsTemplateParams []SmsSlice `json:"smsTemplateParams"`
    }
    
    type SmsSlice struct {
        ParamKey   string `json:"paramKey"`
        ParamValue string `json:"paramValue"`
    }
    
    
    
    func EncodeJson(tel string, text string) string {
        //var params data
        //params :=new(data)
        params := data{}
        smsslice := SmsSlice{}
        smsslice.ParamKey = "content"
        smsslice.ParamValue = text
        params.TemplateId = 122
        params.MobileNum = strings.Split(tel, ",")
        params.ClientIp = "10.10.10.176"
        params.SystemId = 1000
        params.SmsTemplateParams = append(params.SmsTemplateParams, smsslice)
        jsonStr, err := json.Marshal(params)
        if err != nil {
            fmt.Println(err.Error())
        }
    
        b64Str := b64.StdEncoding.EncodeToString([]byte(jsonStr))
    
        fmt.Printf("json:%s\n", b64Str)
        return b64Str
    
    }
    
    func http_transfer(w http.ResponseWriter, req *http.Request) {
        req.ParseForm()
        content := ""
        number := ""
        if req.Method == "GET" || req.Method == "POST" {
            //fmt.Println(req.ContentLength)
            content = req.FormValue("content")
            number = req.FormValue("tos")
            w.Write([]byte(fmt.Sprintf("[%s] 短信内容: %s 手机号码:%s!", req.Method, content, number)))
    
        } else {
            http.Error(w, "The method is not allowed.", http.StatusMethodNotAllowed)
        }
    
        EncodeJson(number, content)
        //    b64Str := EncodeJson(number, content)
        //    fmt.Printf("%s\n", string(b64Str))
        //SmsSend(b64Str)
    
    }
    
    func main() {
        http.HandleFunc("/", http_transfer)
        err := http.ListenAndServe(":9000", nil)
        if err != nil {
            fmt.Println("ListenAndServe failed:", err)
        }
    }

Answer 1

这个问题有点意思，引发的原因原来是浏览器默认会去请求xxx/favicon.ico
已经fixed