Preventing URLSession redirect in Swift

Question

I need to fetch a redirecting URL but prevent redirection in Swift. From other posts and Apple docs I understand I must implement the delegate method URLS

Answer 1

Minor adjustments to the solutions proposed above. This works with Swift 2 in XCode 7.

import UIKit
import Foundation
import XCPlayground

XCPSetExecutionShouldContinueIndefinitely(true)

class MySession: NSObject, NSURLSessionDelegate {

    // to prevent redirection
    func URLSession(session: NSURLSession, task: NSURLSessionTask, willPerformHTTPRedirection response: NSHTTPURLResponse, newRequest request: NSURLRequest, completionHandler: (NSURLRequest!) -> Void) {
    completionHandler(nil)
    }

    // fetch data from URL with NSURLSession
    class func getDataFromServerWithSuccess(myURL: String, noRedirect: Bool, success: (response: String!) -> Void) {
    var myDelegate: MySession? = nil
    if noRedirect {
        myDelegate = MySession()
    }
    let session = NSURLSession(configuration: NSURLSessionConfiguration.defaultSessionConfiguration(), delegate: myDelegate, delegateQueue: nil)
    let loadDataTask = session.dataTaskWithURL(NSURL(string: myURL)!) { (data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in
        // OMITTING ERROR CHECKING FOR BREVITY
        success(response: NSString(data: data!, encoding: NSASCIIStringEncoding) as! String)
    }
    loadDataTask.resume()
    }

    // extract data from redirect
    class func getRedirectionInfo(url: String) {
    getDataFromServerWithSuccess(url, noRedirect: true) {(data) -> Void in
        if let html = data {
            if html.rangeOfString("\n", options: .RegularExpressionSearch) != nil {
                print("success: redirection was prevented")
            } else {
                print("failure: redirection went through")
            }
        }
    }
    }
}

MySession.getRedirectionInfo("http://bit.ly/filmenczer")