NSURLSession: How to increase time out for URL requests?

Question

I am using iOS 7's new NSURLSessionDataTask to retrieve data as follows:

NSURLSession *session = [NSURLSession sharedSession];

NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:
request completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error) {
//
}];

How can I increase the time out values to avoid the error "The request timed out" (in NSURLErrorDomain Code=-1001)?

I have checked the documentation for NSURLSessionConfiguration but did not find a way to set the time out value.

Thank you for your help!

Answer 1

ObjC

NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
sessionConfig.timeoutIntervalForRequest = 30.0;
sessionConfig.timeoutIntervalForResource = 60.0;

Swift

let sessionConfig = URLSessionConfiguration.default
sessionConfig.timeoutIntervalForRequest = 30.0
sessionConfig.timeoutIntervalForResource = 60.0
let session = URLSession(configuration: sessionConfig)

What docs say

timeoutIntervalForRequest and timeoutIntervalForResource specify the timeout interval for the request as well as the resource.

timeoutIntervalForRequest - The timeout interval to use when waiting for additional data. The timer associated with this value is reset whenever new data arrives. When the request timer reaches the specified interval without receiving any new data, it triggers a timeout.

timeoutIntervalForResource - The maximum amount of time that a resource request should be allowed to take. This value controls how long to wait for an entire resource to transfer before giving up. The resource timer starts when the request is initiated and counts until either the request completes or this timeout interval is reached, whichever comes first.

Based on NSURLSessionConfiguration Class Reference

Answer 2

In case Swift developer coming here

to do this, you need to use

    let urlconfig = NSURLSessionConfiguration.defaultSessionConfiguration()
    urlconfig.timeoutIntervalForRequest = 12
    urlconfig.timeoutIntervalForResource = 12
    self.session = NSURLSession(configuration: urlconfig, delegate: self.delegates, delegateQueue: nil)

Answer 3

In swift 3. timeout 15 seconds.

    let configuration = URLSessionConfiguration.default
    configuration.timeoutIntervalForRequest = TimeInterval(15)
    configuration.timeoutIntervalForResource = TimeInterval(15)
    let session = URLSession(configuration: configuration)

Answer 4

In my case I was increasing the timeout of the wrong class. My timeout error was solved by increasing the timeout of the URLRequest not the URLSession

var request = URLRequest(url: url)
request.timeoutInterval = 30

Answer 5

NSURLSessionConfiguration includes the property timeoutIntervalForRequest:

@property NSTimeInterval timeoutIntervalForRequest

to control the timeout interval. There is also timeoutIntervalForResource for the timeout after the request is initiated.

Answer 6

In SWIFT 3.0, You need to use

 if let cleanURLString = urlString.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed),
    let theURL: Foundation.URL = Foundation.URL(string: cleanURLString) {

    var task:URLSessionDataTask?
    let urlconfig = URLSessionConfiguration.default
    urlconfig.timeoutIntervalForRequest = 20
    urlconfig.timeoutIntervalForResource = 60
    let session = Foundation.URLSession(configuration: urlconfig, delegate: self, delegateQueue: OperationQueue.main)

    let request = URLRequest(url: theURL)
    request.httpMethod = "POST"
    request.cachePolicy = URLRequest.CachePolicy.reloadIgnoringCacheData
    request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
    let paramString = YourParameterString
    request.httpBody = paramString.data(using: String.Encoding.utf8)

    task = session.dataTask(with: request) {
        (data, response, error) in
        // Do here
    })
    dataTask.resume()
}

Answer 7

For Swift 4:

let config = URLSessionConfiguration.default
config.timeoutIntervalForRequest = TimeInterval(15)
config.timeoutIntervalForResource = TimeInterval(15)
let urlSession = URLSession(configuration: config)

The timeoutIntervalForRequest is for all tasks within sessions based on this configuration. The timeoutIntervalForResource is for all tasks within sessions based on this configuration.