How to use a Proxy Server with Alamofire 4 and Swift 3

Based off Manishg's answer I use the following to avoid warnings

let configuration = URLSessionConfiguration.default
configuration.httpAdditionalHeaders = SessionManager.defaultHTTPHeaders

var proxyConfiguration = [String: AnyObject]()
proxyConfiguration.updateValue(1 as AnyObject, forKey: "HTTPEnable")
proxyConfiguration.updateValue("eu-west-static-01.quotaguard.com" as AnyObject, forKey: "HTTPProxy")
proxyConfiguration.updateValue(9293 as AnyObject, forKey: "HTTPPort")
proxyConfiguration.updateValue(1 as AnyObject, forKey: "HTTPSEnable")
proxyConfiguration.updateValue("eu-west-static-01.quotaguard.com" as AnyObject, forKey: "HTTPSProxy")
proxyConfiguration.updateValue(9293 as AnyObject, forKey: "HTTPSPort")
configuration.connectionProxyDictionary = proxyConfiguration

sharedManager = Alamofire.SessionManager(configuration: configuration)

The https constants have been deprecated and could be removed at anytime. By using the string values, the code might break but it won't crash

I think the working (supposed to be deprecated) keys are:

kCFStreamPropertyHTTPSProxyHost
kCFStreamPropertyHTTPSProxyPort

Could you try this code?

import UIKit
import Alamofire

class ViewController: UIViewController {

    var requestManager = Alamofire.SessionManager.default

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(true)

         var proxyConfiguration = [NSObject: AnyObject]()
         proxyConfiguration[kCFNetworkProxiesHTTPProxy] = "eu-west-static-01.quotaguard.com" as AnyObject?
         proxyConfiguration[kCFNetworkProxiesHTTPPort] = "9293" as AnyObject?
         proxyConfiguration[kCFNetworkProxiesHTTPEnable] = 1 as AnyObject?
         proxyConfiguration[kCFStreamPropertyHTTPSProxyHost as String] = "eu-west-static-01.quotaguard.com"
         proxyConfiguration[kCFStreamPropertyHTTPSProxyPort as String] = 9293
         proxyConfiguration[kCFProxyUsernameKey as String] = xxx
         //proxyConfiguration[kCFProxyPasswordKey as String] = "pwd if any"
        let cfg = Alamofire.SessionManager.default.session.configuration
        cfg.connectionProxyDictionary = proxyConfiguration

        let ip = URL(string: "https://api.ipify.org?format=json")

        requestManager = Alamofire.SessionManager(configuration: cfg)
        requestManager.request(ip!).response { response in
            print("Request: \(response.request)")
            print("Response: \(response.response)")
            print("Error: \(response.error)")

            if let data = response.data, let utf8Text = String(data: data, encoding: .utf8) {
                print("Data: \(utf8Text)")
            }
        }
    }
}

Also please make sure your proxy server is configured to handle https requests.

Note: It might give deprecated warning for those keys but keys are still working (see https://forums.developer.apple.com/thread/19356#131446)

Note: I posted the same answer here. Posting the same here as it was applicable here as well. Alamofire is using same URLSessionConfiguration.