Cookie getMaxAge

问题描述

我无法检索cookie maxage它总是返回-1

I can't retrieve cookie maxage it always returns -1

创建cookie：

Cookie securityCookie = new Cookie("sec", "somevalue");
securityCookie.setMaxAge(EXPIRATION_TIME);

检索cookie：

Cookie[] cookies = request.getCookies();
if (cookies != null) {
    for(int i=0; i<cookies.length; i++) {
        Cookie cookie = cookies[i];
        if ("sec".equals(cookie.getName())){
            int age = cookie.getMaxAge();
        }
    }
}

我总是年龄= -1

当我检查firefox cookie到期时，我看到奇怪的日期。

also when i check in firefox cookie expiration i see strange date.

Thx

推荐答案

当浏览器将cookie发送回原始服务器时，它不包含任何年龄。因此，上面的检索代码没有收到最大年龄是合乎逻辑的：它不包含在请求中。

When a browser sends a cookie back to the origin server, it doesn't include any age. So it is logical that your "retrieve" code above does not receive a max age: it is not included in the request.

当从服务器收到cookie时，浏览器使用max age参数来确定cookie应保留多长时间;年龄永远不会传回服务器，过期的cookie就会被丢弃。处理请求时，如果要续订cookie的年龄，请在响应中重新包含cookie。

When the cookie is received from the server, the browser uses the max age parameter to determine how long the cookie should be kept; the age is never communicated back to the server, an expired cookie is simply discarded. When processing a request, if you want to renew the age of the cookie, reinclude the cookie in the response.

另请参阅向原始服务器发送Cookie部分在中。

Also see the section "Sending Cookies to the Origin Server" in the RFC.

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