ios - 从 http header 中删除 cookie？

Question

我正在使用带有简单 header 身份验证的 Web 服务

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
    NSString *userName = [_usernameTextField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];;
    NSString *passWord  = [_passwordTextfield.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
    if ([challenge previousFailureCount] == 0) {
        //Creating new credintial
        NSURLCredential *newCredential = [NSURLCredential credentialWithUser:userName
                                                                    password:passWord
                                                                 persistence:NSURLCredentialPersistenceForSession];
        [[challenge sender] useCredential:newCredential forAuthenticationChallenge:challenge];
    }
    else {
        CommonCode*objCommon=[[CommonCode alloc]init];
        [_activityIndicator stopAnimating];
        [objCommon showAlert:@"Invalid Password, or no user found with this Email Address"];
    }
}

在注销时我用

清除cokies

- (void)resetCredintialCache {
    NSDictionary *credentialsDict = [[NSURLCredentialStorage sharedCredentialStorage] allCredentials];
    if ([credentialsDict count] > 0) {
        // the credentialsDict has NSURLProtectionSpace objs as keys and dicts of userName => NSURLCredential
        NSEnumerator *protectionSpaceEnumerator = [credentialsDict keyEnumerator];
        id urlProtectionSpace;
        // iterate over all NSURLProtectionSpaces
        while (urlProtectionSpace = [protectionSpaceEnumerator nextObject]) {
            NSEnumerator *userNameEnumerator = [credentialsDict[urlProtectionSpace] keyEnumerator];
            id userName;
            // iterate over all usernames for this protectionspace, which are the keys for the actual NSURLCredentials
            while (userName = [userNameEnumerator nextObject]) {
                NSURLCredential *cred = credentialsDict[urlProtectionSpace][userName];
                [[NSURLCredentialStorage sharedCredentialStorage] removeCredential:cred forProtectionSpace:urlProtectionSpace];
            }
        }
        NSURLCache *sharedCache = [NSURLCache sharedURLCache];
        [sharedCache removeAllCachedResponses];
        NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];

        NSArray *cookies = [cookieStorage cookies];
        for (NSHTTPCookie *cookie in cookies) {

            [cookieStorage deleteCookie:cookie];
        }
    }
}

但是在注销后，如果我输入错误的密码，我将以以前的用户身份登录。如何从 HTTP 请求的 header 中删除 cookie？

Answer 1

NSURLRequest有一个cachePolicy属性，指定了请求的缓存行为。

设置以下缓存策略NSURLRequestReloadIgnoringLocalCacheData 发出请求时，如下例将从 url 而不是缓存加载数据。

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10];

NSURLRequestReloadIgnoringLocalCacheData

Specifies that the data for the URL load should be loaded from the originating source. No existing cache data should be used to satisfy a URL load request.

https://developer.apple.com/library/prerelease/mac/documentation/Cocoa/Reference/Foundation/Classes/NSURLRequest_Class/index.html#//apple_ref/c/tdef/NSURLRequestCachePolicy