NSURLSessionTask never calls back after timeout when using background configuration

Question

I am using NSURLSessionDownloadTask with background sessions to achieve all my REST requests. This way I can use the same code without have to think about my applic

Answer 1

Timeout for DownloadTask is thrown by NSURLSessionTaskDelegate not NSURLSessionDownloadDelegate

To trigger a timeout(-1001) during a downloadTask:

Wait till download starts. percentage chunks of data downloading will trigger:

URLSession:downloadTask:didWriteData:totalBytesWritten:totalBytesExpectedToWrite:

Then PAUSE the whole app in XCode debugger.

Wait 30secs.

Unpause the app using XCode debugger buttons

The http connection from server should time out and trigger:

-1001 "The request timed out."

#pragma mark -
#pragma mark NSURLSessionTaskDelegate - timeouts caught here not in DownloadTask delegates
#pragma mark -
- (void)URLSession:(NSURLSession *)session
              task:(NSURLSessionTask *)task
didCompleteWithError:(NSError *)error
{

    if(error){

        ErrorLog(@"ERROR: [%s] error:%@", __PRETTY_FUNCTION__,error);

        //-----------------------------------------------------------------------------------
        //-1001 "The request timed out." 
//        ERROR: [-[SNWebServicesManager URLSession:task:didCompleteWithError:]] error:Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo={NSUnderlyingError=0x1247c42e0 {Error Domain=kCFErrorDomainCFNetwork Code=-1001 "(null)" UserInfo={_kCFStreamErrorCodeKey=-2102, _kCFStreamErrorDomainKey=4}}, NSErrorFailingURLStringKey=https://directory.clarksons.com/api/1/dataexport/ios/?lastUpdatedDate=01012014000000, NSErrorFailingURLKey=https://directory.clarksons.com/api/1/dataexport/ios/?lastUpdatedDate=01012014000000, _kCFStreamErrorDomainKey=4, _kCFStreamErrorCodeKey=-2102, NSLocalizedDescription=The request timed out.}
        //-----------------------------------------------------------------------------------


    }else{
        NSLog(@"%s SESSION ENDED NO ERROR - other delegate methods should also be called so they will reset flags etc", __PRETTY_FUNCTION__);
    }
}