NSHTTPCookieStorage状态未保存在应用退出。任何确定的知识/文档在那里？ [英] NSHTTPCookieStorage state not saved on app exit. Any definitive knowledge/documentation out there?

问题描述

出现一些隐藏的iOS执行HTTP的问题，无法正确管理无会话的Cookie。任何时候HTTP响应设置或删除cookie，立即检查NSHTTPCookieStorage cookie将产生预期的结果，并指示正确的sessionOnly值。

但如果应用程序很快退出一个响应更新cookie，在重新启动那些sessionOnly = FALSE后，Cookie将恢复到某个先前状态，并且最近的更新丢失。

Cookie是否由响应头或NSHTTPCookieStorage setCookie：没有区别。

一些缓存/同步巫毒必须在幕后进行。

任何人谁有或可以指向这种行为的一些明确的解释，持续时间可以长达5秒。这是一个bug，简单明了吗？

您可以用来重现的一些代码：

   - （void）applicationDidBecomeActive：（UIApplication *）application 
 {
 
 [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookieAcceptPolicy：NSHTTPCookieAcceptPolicyAlways]; 
 
 NSHTTPCookie * cookie; 
（[NSHTTPCookieStorage sharedHTTPCookieStorage] .cookies中的Cookie）{
 NSLog（@％@ =％@，cookie.name，cookie.value）; 
} 
 
 NSMutableDictionary * cookieProperties = [NSMutableDictionary dictionary]; 
 [cookieProperties setObject：@testCookieforKey：NSHTTPCookieName]; 
 [cookieProperties setObject：[NSString stringWithFormat：@％f，[[NSDate date] timeIntervalSince1970]] forKey：NSHTTPCookieValue]; 
 [cookieProperties setObject：@www.example.comforKey：NSHTTPCookieDomain]; 
 [cookieProperties setObject：@www.example.comforKey：NSHTTPCookieOriginURL]; 
 [cookieProperties setObject：@/forKey：NSHTTPCookiePath]; 
 [cookieProperties setObject：@0forKey：NSHTTPCookieVersion]; 
 
 //设置过期到一个月后
 [cookieProperties setObject：[[NSDate date] dateByAddingTimeInterval：2629743] forKey：NSHTTPCookieExpires]; 
 
 cookie = [NSHTTPCookie cookieWithProperties：cookieProperties]; 
 [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie：cookie]; 
 
} 
  

此代码应在每次启动时输出一个新值。

一些可能相关的堆栈溢出问题：

iphone NSHTTPCookieStorage可在应用程式上重新开启吗？

iPhone：NSHTTPCookie不会保存应用程式重新启动

NSHTTPCookie拒绝删除

删除NSHTTPCookie返回如果应用程序被终止

解决方案

我认为答案在您的问题中链接到的一个的SO帖子：

我做了一个示例项目来重现这个问题 - 发现
只会在应用程序收到SIGKILL信号时发生，比如当
调试器在Xcode中停止时。在我的实验中，未处理的
异常，崩溃，exit（）和abort（）不会导致
NSHTPPCookieStorage松散数据。

看起来像一个只调试的问题（它只发生在使用
调试器），我关闭了以前填写的雷达。

您可以通过正常重新启动电话并观察对NSHTTPCookieStorage的所有更改是否正确保留并重新加载来进行测试。

Struggling with this problem and loath to implement a custom cookie management system.

It appears some hidden level of iOS's implementation of HTTP fails to manage sessionless cookies properly. Any time an HTTP response sets or deletes a cookie, immediate inspection of NSHTTPCookieStorage cookies will yield the expected results and indicate the correct sessionOnly value.

But if the app quits soon after a response updates cookies, upon relaunch those sessionOnly=FALSE cookies will be reverted to some previous state and the most recent updates lost.

Whether the cookies are set/deleted by a response header or NSHTTPCookieStorage setCookie: makes no difference.

Some caching/syncing voodoo must be going on behind the scenes. The time it takes for the cookie to become persistent can be up to 5 seconds.

ANYONE out there who has or can point to some definitive explanation of this behavior? Is it a bug, plain and simple? Or some undocumented feature whose purpose I can't comprehend?

Some code you can use to reproduce:

- (void)applicationDidBecomeActive:(UIApplication *)application
{

    [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookieAcceptPolicy:NSHTTPCookieAcceptPolicyAlways];

    NSHTTPCookie *cookie;
    for (cookie in [NSHTTPCookieStorage sharedHTTPCookieStorage].cookies) {
        NSLog(@"%@=%@", cookie.name, cookie.value);
    }

    NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];
    [cookieProperties setObject:@"testCookie" forKey:NSHTTPCookieName];
    [cookieProperties setObject:[NSString stringWithFormat:@"%f", [[NSDate date] timeIntervalSince1970]] forKey:NSHTTPCookieValue];
    [cookieProperties setObject:@"www.example.com" forKey:NSHTTPCookieDomain];
    [cookieProperties setObject:@"www.example.com" forKey:NSHTTPCookieOriginURL];
    [cookieProperties setObject:@"/" forKey:NSHTTPCookiePath];
    [cookieProperties setObject:@"0" forKey:NSHTTPCookieVersion];

    // set expiration to one month from now
    [cookieProperties setObject:[[NSDate date] dateByAddingTimeInterval:2629743] forKey:NSHTTPCookieExpires];

    cookie = [NSHTTPCookie cookieWithProperties:cookieProperties];
    [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];

}

This code should output a new value on every launch. Instead you will see that if you quit the app quickly the value is unchanged.

Some possibly related stack overflow questions:

iphone NSHTTPCookieStorage avaible on app reopen?

iPhone: NSHTTPCookie is not saved across app restarts

NSHTTPCookies refuse to be deleted

deleted NSHTTPCookie returns if app is terminated

解决方案

I think the answer lies in one of the SO posts linked to in your question:

I made a sample project to reproduce this issue — and found that it would only occur when the app receives a SIGKILL signal, like when the debugger is stopped from within Xcode. In my experiments, unhandled exceptions, crashes, exit() and abort() don't cause NSHTPPCookieStorage to loose data.

As this looks like a debugging-only issue (it only occurs when using the debugger), I closed the radar I filled previously.

You can test this by restarting the phone normally and observing that all changes to NSHTTPCookieStorage are correctly persisted and reloaded.

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