NSHTTPCookieStorage 的共享实例不保留 cookie

问题描述

我正在开发一个应用程序，在该应用程序中服务器将 cookie 交给我来识别用户.

I'm developing an application where the server hands me a cookie to identify the user.

我的连续请求需要该 cookie 才能获得用户期望的响应.我无法理解的是 NSHTTPCookieStorage 的共享实例如何以及何时丢失其 cookie.

My successive requests need to have that cookie to have the response that the user expects. What I can't understand is how and when the shared instance of NSHTTPCookieStorage loses its cookies.

我使用的第一个解决方案是在应用程序终止时将 cookie 从我的服务器存档并保存到用户默认值，然后在应用程序启动时从我的服务器中清除现有的 cookie，并重置我存储的那些.在开发过程中，我没有遇到任何问题，因为调试会话非常短，通常不需要将应用程序置于后台.

The first solution I used is to archive and save the cookies from my server to user defaults on application terminations then clear existing ones from my server on application launch and reset the ones I stored. Through the developing process I didn't encounter problems as the sessions for debugging are very short and didn't usually need to put the app in background.

在 Beta 测试期间，问题开始了.我带来的技巧是不仅在应用程序终止时保存 cookie，而且在将这些 cookie 交还给我的 API 调用之后保存.并且不仅在应用启动时加载保存的 cookie，而且在应用返回前台时加载.

During beta testing, troubles started. The hack I came with is to save the cookies not only on application termination but also after the API calls that hand me back these cookies. And to load the saved cookies not only on app launch but also when the app returns to foreground.

NSHTTPCookieStorage 共享实例如何摆脱这些 cookie 以及处理它的最佳实践是什么，因为它是我的应用程序的重要组成部分，如果没有更有经验的开发人员支持，我无法相信这种被黑的解决方案.

How come the NSHTTPCookieStorage share instance gets rid of these cookies and what's the best practice to deal with it as it's a vital part of my app and I can't trust such a hacked solution if not backed up by more experienced developers.

提前感谢您的回答

以下是保存/读取/清除cookies的方法

Here are the methods to save/read/clear the cookies

-(void)saveStoredCookies
{
    NSURL *httpUrl = @"http://myServer.com";
    NSURL *httpsUrl = @"https://myServer.com";

    NSArray *httpCookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:httpUrl];
    NSData *httpCookiesData = [NSKeyedArchiver archivedDataWithRootObject:httpCookies];
    [[NSUserDefaults standardUserDefaults] setObject:httpCookiesData forKey:@"savedHttpCookies"];

    NSArray *httpsCookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:httpsUrl];
    NSData *httpsCookiesData = [NSKeyedArchiver archivedDataWithRootObject:httpsCookies];
    [[NSUserDefaults standardUserDefaults] setObject:httpsCookiesData forKey:@"savedHttpsCookies"];

    [[NSUserDefaults standardUserDefaults] synchronize];
}

-(void)readStoredCookies
{
    //clear, read and install stored cookies
    NSURL *httpUrl = @"http://myServer.com";
    NSURL *httpsUrl = @"https://myServer.com";

    NSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:httpUrl];
    for (NSHTTPCookie *cookie in cookies) {
        [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];
    }
    cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:httpsUrl];
    for (NSHTTPCookie *cookie in cookies) {
        [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];
    }

    NSData *httpCookiesData = [[NSUserDefaults standardUserDefaults] objectForKey:@"savedHttpCookies"];
    if([httpCookiesData length]) {
        NSArray *savedCookies = [NSKeyedUnarchiver unarchiveObjectWithData:httpCookiesData];
        for (NSHTTPCookie *cookie in savedCookies) {
            [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
        }       
    }
    NSData *httpsCookiesData = [[NSUserDefaults standardUserDefaults] objectForKey:@"savedHttpsCookies"];
    if([httpsCookiesData length]) {
        NSArray *savedCookies = [NSKeyedUnarchiver unarchiveObjectWithData:httpsCookiesData];
        for (NSHTTPCookie *cookie in savedCookies) {
            [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
        }       
    }
}

-(void)clearStoredCookies
{
    NSURL *httpUrl = @"http://myServer.com";
    NSURL *httpsUrl = @"https://myServer.com";
    NSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:httpUrl];
    for (NSHTTPCookie *cookie in cookies) {
        [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];
    }
    cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:httpsUrl];
    for (NSHTTPCookie *cookie in cookies) {
        [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];
    }
}

推荐答案

解决了！

经过一些简单的调试后，我发现问题出在我在 cookiesForURL: 中使用的 url.我只是开始使用 cookies 属性，现在它工作正常.

After some simple debugging I found out that the problem was with the url I was using in cookiesForURL:. I simply started using cookies property and now it works fine.

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