dongqiangou5724
2014-12-27 20:13
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如何删除cookie

I wrote a web application that set a cookie and delete it. To clarify to scenario what I mean look at the following code snippet.

package main

import (
    "fmt"
    "github.com/gorilla/mux"
    "net/http"
    "time"
)

func rootHandler(rw http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(rw, "Hello Foo")

}

func setCookieHandler(rw http.ResponseWriter, r *http.Request) {
    c := &http.Cookie{
        Name:     "storage",
        Value:    "value",
        Path:     "/",
        MaxAge:   0,
        HttpOnly: true,
    }

    http.SetCookie(rw, c)
}

func deleteCookieHandler(rw http.ResponseWriter, r *http.Request) {

    c, err := r.Cookie("storage")
    if err != nil {
        panic(err.Error())
    }
    c.Name = "Deleted"
    c.Value = "Unuse"
    c.Expires = time.Unix(1414414788, 1414414788000)
}

func readCookieHandler(rw http.ResponseWriter, r *http.Request) {

    c, err := r.Cookie("storage")
    if err != nil {
        panic(err.Error())
    }
    fmt.Println(c.Expires)
}

func evaluateCookieHandler(rw http.ResponseWriter, r *http.Request) {

    c, err := r.Cookie("storage")
    if err != nil {
        panic(err.Error())
    }

    if time.Now().After(c.Expires) {
        fmt.Println("Cookie is expired.")
    }
}

func main() {
    mux := mux.NewRouter()
    mux.HandleFunc("/", rootHandler)
    mux.HandleFunc("/cookie", setCookieHandler)
    mux.HandleFunc("/delete", deleteCookieHandler)
    mux.HandleFunc("/read", readCookieHandler)
    mux.HandleFunc("/eval", evaluateCookieHandler)

    http.ListenAndServe(":3000", mux)
}

As you can see, when I visit /cookie location, it will be set a cookie as expected. Then when I call /delete, it should change the name, value and expired time from cookie. The expired time is changed, but name and value not.

enter image description here

What do I want is, to delete the cookie from browser for sign out in a authentication system, when user click sign out button to delete cookie.
I also discover this link and follow the advice, but does not work as expected.

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2条回答 默认 最新

  • drbl91357 2014-12-27 20:33
    最佳回答

    Cookies are keyed by name, so when you "change" the name, you actually "create" a different cookie, already expired.

    Keep the name the same and it should work, but don't forget to take some time one day to read about cookies and how they work.

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