NSOperationQueue * queue = [[NSOperationQueue alloc] init];
queue.maxConcurrentOperationCount = 1;
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
_session = [NSURLSession sessionWithConfiguration:config delegate:[XXWebImageWeakProxy proxyWithTarget:self] delegateQueue:queue];
……
_sessionTask = [_session dataTaskWithRequest:_request];
[_sessionTask resume];
--
(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge
completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * _Nullable credential))completionHandler {
@autoreleasepool {
NSURLSessionAuthChallengeDisposition disposition = NSURLSessionAuthChallengePerformDefaultHandling;
NSURLCredential *creadential = nil;
if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
creadential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
if (creadential) {
disposition = NSURLSessionAuthChallengeUseCredential;
} else {
disposition = NSURLSessionAuthChallengePerformDefaultHandling;
}
} else {
if ([challenge previousFailureCount] == 0) {
creadential = _credential;
if (creadential) {
disposition = NSURLSessionAuthChallengeUseCredential;
} else {
disposition = NSURLSessionAuthChallengePerformDefaultHandling;
}
} else {
disposition = NSURLSessionAuthChallengePerformDefaultHandling;
}
}
if (completionHandler) {
completionHandler(disposition, creadential);
}
}
}
