Cancel NSURLSession dataTask when request is taking too long - ios

Question

On certain websites the below method hangs indefinitely, I'd like to cancel the request when its taking too long, I thought that timeoutIntervalForRequest and timeoutIntervalForResource would control this but setting either of them doesn't seem to have any effect.
This is an example website that the request hangs indefinitely on: http://www.samtoft.co.uk/showpic.php?id=542&order=&search=#header
// fetch data from URL with NSURLSession
class func getDataFromServerWithSuccess(myURL: String, noRedirect: Bool, callback: Result<String> -> Void) {
var loadDataTask: NSURLSessionDataTask? = nil
let sessionConfig: NSURLSessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()
sessionConfig.timeoutIntervalForRequest = 10.0
sessionConfig.timeoutIntervalForResource = 10.0
var myDelegate: MySession? = nil
if noRedirect {
myDelegate = MySession()
}
let session = NSURLSession(configuration: sessionConfig, delegate: myDelegate, delegateQueue: nil)
loadDataTask = session.dataTaskWithURL(NSURL(string: myURL)!) { (data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in
if let checkedData = data {
let success = Result.Success(NSString(data: checkedData, encoding: NSASCIIStringEncoding) as! String)
callback(success)
} else {
let redirectError = NetworkError.FailedUrl("\(myURL) + \(error)")
if let request = loadDataTask?.currentRequest {
guard let urlExtension = request.URL?.pathExtension else {return}
guard let domain = request.URL?.host else {return}
guard let finalURLAsString = request.URL?.description else {return}
let failure = Result.Failure("\(finalURLAsString) + \(redirectError)")
callback(failure)
}
}
}
loadDataTask!.resume()
}
EDIT: for anyone who is having the same issue I was, the problem was that I was accounting for the success case and the error case, but not for when the request returned no response, so I added the below:
if response == nil {
print("NO RESPONSE \(myURL)")
let noResponse = Result.NoResponse("NO RESPONSE")
callback(noResponse)
}

Answer 1

I have extracted your code as
func getDataFromServerWithSuccess(myURL: String) {
var loadDataTask: NSURLSessionDataTask? = nil
let sessionConfig: NSURLSessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()
//sessionConfig.timeoutIntervalForRequest = 11.0
sessionConfig.timeoutIntervalForResource = 11.0
let session = NSURLSession(configuration: sessionConfig)
loadDataTask = session.dataTaskWithURL(NSURL(string: myURL)!) { (data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in
print("end")
}
loadDataTask!.resume()
}
It does work sensitively for the timeout. I suppose there may be something wrong with the delegator which cannot receive the response properly. Hope this helps.