Just on one client device iPhone4s with iOS7.1 we have crash with stack:
Thread : Crashed: com.apple.NSURLSession-work
0 CoreFoundation 0x2d6419be CFURLCopyScheme + 49
1 CFNetwork 0x2d30b67d _urlIsHTTPish + 8
2 CFNetwork 0x2d30b67d _urlIsHTTPish + 8
3 CFNetwork 0x2d31f725 URLRequest::addOverridingSessionAttributes(_CFURLSessionConfiguration*) + 216
4 CFNetwork 0x2d374eb9 ClassicConnectionSession::createConnectionWithProperties(_CFURLRequest const*, __CFDictionary const*) const + 552
5 CFNetwork 0x2d35697d __73-[__NSCFLocalSessionBridge downloadTaskForRequest:resumeData:completion:]_block_invoke + 196
6 libdispatch.dylib 0x3844081f _dispatch_client_callout + 22
7 libdispatch.dylib 0x384467cb _dispatch_barrier_sync_f_invoke + 26
8 CFNetwork 0x2d2fbd89 -[__NSCFLocalSessionTask resume] + 100
Does anybody else had this?
EDIT: Duplication of question: Asynchronous downloading in UICollectionView error with AFNetworking
CFURLCopyScheme crashed as CFURL passed to this method is nil, iOS7 does not check if url passed to NSURLSessionDownloadTask is valid.
Check that:
1) NSURL passed to request downloadTaskWithRequest was not nil
2) NSURL does not contain invalid characters e.g:
% |{}><"\`