NSURLConnectionDelegate willSendRequestForAuthenticationChallenge将不会在iOS 8上调用

Question

我的服务器提供了几种身份验证方法:NTLM和摘要.
我的iOS客户端不会处理NTLM身份验证,因此我实现connection:willSendRequestForAuthenticationChallenge:委托拒绝NTLM,然后仅使用正确的凭据进行摘要身份验证质询.
到目前为止,iOS 7上的一切正常.

但在iOS 8,我发现了一个奇怪的现象:
在connection:willSendRequestForAuthenticationChallenge:代表不会在大部分时间(95%)被调用!

我得到了这个错误:

Error: Error Domain=NSPOSIXErrorDomain Code=54 "The operation couldn’t be completed. Connection reset by peer" 
UserInfo=0x16520fb0 {_kCFStreamErrorCodeKey=54, 
NSErrorPeerAddressKey=<CFData 0x16682e40 [0x2f752440]>{length = 16, capacity = 16, bytes = 0x10020d7eac12780b0000000000000000}, 
NSErrorFailingURLKey=http://SERVER_IP:SERVER_PORT/Tunnel/Message.aspx, 
NSErrorFailingURLStringKey=http://SERVER_IP:SERVER_PORT/Tunnel/Message.aspx, 
_kCFStreamErrorDomainKey=1}

只有5%的时间正确调用代理并照常工作.

下面显示了如何将我的请求发送到服务器并处理身份验证质询:

- (void)postRequest
{
    NSString *IP = SERVER_IP;
    int port = SERVER_PORT;

    NSString *url = [NSString stringWithFormat:@"http://%@:%d/Tunnel/Message.aspx", IP, port];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"application/xml" forHTTPHeaderField:@"Content-Type"];

    NSString *xml = [NSString stringWithFormat:@"<?xml version=\"1.0\" encoding=\"UTF-8\"?><GetServerInfo></GetServerInfo>"];
    [request setHTTPBody: [xml dataUsingEncoding:NSUTF8StringEncoding]];

    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
    NSLog(@"%@", challenge.protectionSpace);

    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodHTTPDigest])
    {
        if ([challenge previousFailureCount] == 0)
        {
            [[challenge sender] useCredential:[NSURLCredential credentialWithUser:USERNAME
                                                                         password:PASSWORD
                                                                      persistence:NSURLCredentialPersistenceNone]
                   forAuthenticationChallenge:challenge];
        }
        else
        {
            [[challenge sender] continueWithoutCredentialForAuthenticationChallenge:challenge];
        }
    }
    else
    {
        [[challenge sender] rejectProtectionSpaceAndContinueWithChallenge:challenge];
    }
}

这些代码在iOS 7上运行,willSendRequestForAuthenticationChallenge在身份验证挑战期间多次调用,但在iOS 8上甚至没有调用过一次!

这可能是iOS 8的错误或iOS 8以来的变化吗？

Answer 1

当我将 iOS 7 应用程序更新到 iOS 8 时，就发生了这种情况。我们使用 Oracle SOA 作为中间件，突然它停止调用委托方法。下面的代码在 iOS8 和 iOS7 上都对我有用。（使用 Xcode 6.1）

  - (void) addBasicHTTPAuthenticationHeaders
    {
        NSString * wsUserName = @"userNameForWebService";
        NSString * wsPassword = @"passwordForWebService";

        NSString *authStr = [NSString stringWithFormat:@"%@:%@", wsUserName, wsPassword];
        NSData *authData = [authStr dataUsingEncoding:NSASCIIStringEncoding];
        NSString *authValue = [NSString stringWithFormat:@"Basic %@", [authData base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithCarriageReturn]];
        [urlRequest setValue:authValue forHTTPHeaderField:@"Authorization"];
    }