How to Programmatically Add a Proxy to an Nsurlsession

How to programmatically add a proxy to an NSURLSession

It turns out, the dictionary keys you want are the Stream variants, they are the ones that resolve down to "HTTPProxy" and such:

NSString* proxyHost = @"myProxyHost.com";
NSNumber* proxyPort = [NSNumber numberWithInt: 12345];

// Create an NSURLSessionConfiguration that uses the proxy
NSDictionary *proxyDict = @{
    @"HTTPEnable"  : [NSNumber numberWithInt:1],
    (NSString *)kCFStreamPropertyHTTPProxyHost  : proxyHost,
    (NSString *)kCFStreamPropertyHTTPProxyPort  : proxyPort,

    @"HTTPSEnable" : [NSNumber numberWithInt:1],
    (NSString *)kCFStreamPropertyHTTPSProxyHost : proxyHost,
    (NSString *)kCFStreamPropertyHTTPSProxyPort : proxyPort,
};

NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration ephemeralSessionConfiguration];
configuration.connectionProxyDictionary = proxyDict;

// Create a NSURLSession with our proxy aware configuration
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:[NSOperationQueue mainQueue]];

// Form the request
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.google.com?2"]];

// Dispatch the request on our custom configured session
NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:
                              ^(NSData *data, NSURLResponse *response, NSError *error) {
                                  NSLog(@"NSURLSession got the response [%@]", response);
                                  NSLog(@"NSURLSession got the data [%@]", data);
                              }];

NSLog(@"Lets fire up the task!");
[task resume];

How to use URLSession with Proxy in Swift 3

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

kCFStreamPropertyHTTPSProxyHost
kCFStreamPropertyHTTPSProxyPort

Could you try this code?

func makeRequestViaUrlSessionProxy(_ url: String, completion: @escaping (_ result: String?) -> ()) {

    let request = URLRequest(url: URL(string: url)!)

    let config = URLSessionConfiguration.default
    config.requestCachePolicy = URLRequest.CachePolicy.reloadIgnoringLocalCacheData
    config.connectionProxyDictionary = [AnyHashable: Any]()
    config.connectionProxyDictionary?[kCFNetworkProxiesHTTPEnable as String] = 1
    config.connectionProxyDictionary?[kCFNetworkProxiesHTTPProxy as String] = "142.54.173.19"
    config.connectionProxyDictionary?[kCFNetworkProxiesHTTPPort as String] = 8888
    config.connectionProxyDictionary?[kCFStreamPropertyHTTPSProxyHost as String] = "142.54.173.19"
    config.connectionProxyDictionary?[kCFStreamPropertyHTTPSProxyPort as String] = 8888

    let session = URLSession.init(configuration: config, delegate: nil, delegateQueue: OperationQueue.current)

    let task = session.dataTask(with: request) {
        (data: Data?, response: URLResponse?, error: Error?) in
        if error != nil {
            NSLog("Client-side error in request to \(url): \(error)")
            completion(nil)
            return
        }

        if data == nil {
            NSLog("Data from request to \(url) is nil")
            completion(nil)
            return
        }

        let httpResponse = response as? HTTPURLResponse
        if httpResponse?.statusCode != 200 {
            NSLog("Server-side error in request to \(url): \(httpResponse)")
            completion(nil)
            return
        }

        let encodingName = response?.textEncodingName != nil ? response?.textEncodingName : "utf-8"
        let encoding = CFStringConvertEncodingToNSStringEncoding(CFStringConvertIANACharSetNameToEncoding(encodingName as CFString!))
        let stringData = String(data: data!, encoding: String.Encoding(rawValue: UInt(encoding)))
        session.invalidateAndCancel()
        completion(stringData)
    }
    task.resume()
}

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)

how to authenticate the proxy in urlsession?

URLSessionConfiguration

need additional headers.

let configuration.httpAdditionalHeaders = ["Proxy-Authorization":  Request.authorizationHeader(user: "user", password: "password") ]

Handling redirects with custom NSURLProtocol and HTTP proxy

It turned out the problem was with the redirection for an HTTPS server, while there is no HTTPS proxy defined. To use HTTPS proxy, the code should looks like:

config.connectionProxyDictionary = @
{
    @"HTTPEnable":@YES,
    (id)kCFStreamPropertyHTTPProxyHost:@"1.2.3.4",
    (id)kCFStreamPropertyHTTPProxyPort:@8080,
    @"HTTPSEnable":@YES,
    (id)kCFStreamPropertyHTTPSProxyHost:@"1.2.3.4",
    (id)kCFStreamPropertyHTTPSProxyPort:@8080
};

Source: How to programmatically add a proxy to an NSURLSession

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