doujiao7325 2019-06-14 06:53
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如何为一个请求发送两个响应？

I have a HTTP server in Go in which when client is asking for any file I am serving it using http.ServeFile. I need to send username and password with this file also. For that I am doing it by first sending a response with fmt.Fprintf and later I am doing http.ServeFile. So it is solving the purpose but it is throwing a warning "http: superfluous response.WriteHeader call". How to resolve this.

Please Note: I need to send username and password with the served file.

if r.URL.Path == "/html/home.html" {
   fmt.Fprintf(w, `<!DOCTYPE HTML>
        <html><div><input id="username" type="hidden" readonly value="%s" /> 
        <br><input id="password" type="hidden" readonly value="%s" /><div>`, 
        name, password)
   http.ServeFile(w, r, r.URL.Path[1:])
}
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  • douwen1549 2019-08-16 06:28
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    ERROR:= "http: superfluous response.WriteHeader call". This error is coming as you cannot send two response for one request.

    The best way to achieve what you are trying to do is by using cookies. Send the data in the form of cookies and Bingo. Your work will be done without errors/warnings.

    expiration := time.Now().Add(time.Second * time.Duration(1000))
cookie := http.Cookie{Name: "Token", Value: "username", Expires: expiration}
http.SetCookie(w, &cookie)
usercookie := http.Cookie{Name: "usercookie", Value: "username", Expires: expiration}
http.SetCookie(w, &usercookie)
http.ServeFile(w, r, r.URL.Path[1:])

    This Code will create a cookie and later you can access it. This is the right way of achieving what you want.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
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