Example of using NTLM authentication in Swift 5.5 (iOS 15)

ExampleNTLM.swift

import Foundation


class GakkoTimetableFetcher: NSObject, URLSessionTaskDelegate {
    let login: String
    let password: String
    var session: URLSession?
    
    init(login: String, password: String) {
        self.login = login
        self.password = password
    }
    
    /// Performs auth for NTLM
    func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
        let creds = URLCredential(user: self.login, password: self.password, persistence: .permanent)
        challenge.sender?.use(creds, for: challenge)
        completionHandler(.useCredential, creds)
    }
    
    func schedule(begins: Date, ends: Date) async throws -> (Data, URLResponse) {
        if session == nil {
            session = URLSession(configuration: .default, delegate: self, delegateQueue: nil)
        }
        
        let targetUrl = URL(string: "https://ws.pjwstk.edu.pl/test/Service.svc/XMLService/GetStudentScheduleJson")!
        let req = URLRequest(url: targetUrl)
        
        return try await session!.data(for: req, delegate: self)
    }
}

Based on this gist
https://gist.github.com/stevenschobert/f374c999e5cba6ccf09653b846967c83