结合使用NSURLProtocol和NSURLSession

我的应用程序用于NSURLConnection与服务器通信。我们使用https进行通信。为了在一个地方处理所有请求的身份验证，我NSURLProtocol在该类的委托中使用并处理了身份验证。现在，我决定使用NSURLSession而不是NSURLConnection。我想做得到NSURLProtocol的工作与NSURLSession我创建了一个任务，并使用NSURLProtocol通过

NSMutableURLRequest *sampleRequest = [[NSMutableURLRequest alloc]initWithURL:someURL];
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
configuration.protocolClasses = @[[CustomHTTPSProtocol class]];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];
NSURLSessionDataTask *task = [session dataTaskWithRequest:checkInInfoRequest];
[task resume];

CustomHTTPSProtocol这是我NSURLProtocol班的样子

static NSString * const CustomHTTPSProtocolHandledKey = @"CustomHTTPSProtocolHandledKey";

@interface CustomHTTPSProtocol () <NSURLSessionDataDelegate,NSURLSessionTaskDelegate,NSURLSessionDelegate>

@property (nonatomic, strong) NSURLSessionDataTask *connection;
@property (nonatomic, strong) NSMutableData *mutableData;

@end

@implementation CustomHTTPSProtocol

+ (BOOL)canInitWithRequest:(NSURLRequest *)request {
    if ([NSURLProtocol propertyForKey:CustomHTTPSProtocolHandledKey inRequest:request]) {
        return NO;
    }
    return [[[[request URL]scheme]lowercaseString]isEqualToString:@"https"];
}

+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request {
    return request;
}

- (void) startLoading {
    NSMutableURLRequest *newRequest = [self.request mutableCopy];
    [NSURLProtocol setProperty:@YES forKey:CustomHTTPSProtocolHandledKey inRequest:newRequest];

    NSURLSession*session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:nil];
    self.connection = [session dataTaskWithRequest:newRequest];
    [self.connection resume];
    self.mutableData = [[NSMutableData alloc] init];
}

- (void) stopLoading {
    [self.connection cancel];
    self.mutableData = nil;
}

-(void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler {
    NSLog(@"challenge..%@",challenge.protectionSpace.authenticationMethod);
    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
        [challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];
    }
    else {
        [challenge.sender continueWithoutCredentialForAuthenticationChallenge:challenge];
    }
}

- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
    [self.client URLProtocol:self didLoadData:data];
    NSLog(@"data ...%@  ",data); //handle data here
    [self.mutableData appendData:data];
}

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
    if (!error) {
        [self.client URLProtocolDidFinishLoading:self];
    }
    else {
        NSLog(@"error ...%@  ",error);
        [self.client URLProtocol:self didFailWithError:error];
    }
}

@end

调用开始加载，完成身份验证质询，但此后立即调用停止加载。

一段时间后，返回错误代码-999“已取消”。didReceiveData不被调用。

Note:NSURLProtocol and the Authentication Process worked fine with NSURLConnection.

我想念什么?? 我的问题是

1. 正在注册[NSURLProtocol registerClass：[CustomHTTPSProtocol类]]; 在NSURLConnection上工作正常，但是如何通过NSURLSession在全球范围内恢复NSURLProtocol？

2. 为什么在使用URLSession的NSURLProtocol（相同的URL和逻辑与URLConnection一起使用）中，请求失败，以及如何使NSURLProtocol与URLSession一起使用？

请帮助我，让我知道是否需要更多详细信息。