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Ios simulator access to local server

I am trying to get vacation data in ios app and I am using this code:

    var rest_url = "http://192.168.0.1:8000/rest/users/"

    let url: NSURL = NSURL(string: rest_url)
    let session = NSURLSession.sharedSession()
    let task = session.dataTaskWithURL(url, completionHandler: {data, response, error -> Void in
    if(error != nil) {
        println(error.localizedDescription)
    }
    println(data)
    var err: NSError?

    var jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as NSDictionary!

But i think i cant access my server like this, does anyone know how i can access my server from ios simulator?

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5 answers


Make sure your Mac's IP address is 192.168.0.1. So your url could be



var rest_url = "http://YOUR MAC IP:8000/rest/users/"
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Do you have application transport security settings in your Info.plist file? If not, then for debugging purposes you can set them like

<key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>


These settings allow you to issue requests to any server. But don't do this for the production version. It's not safe.

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Maybe you can replace 192.168.0.1 with localhost when debugging with the ios simulator (i.e. real devices should use your server's IP).

I also cannot access my test server using the IP on the simulator. But when I use localhost or 120.0.0.1 the simulator can work well with my test server.

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If you have a server running on a computer that is running the iOS simulator, you need to select " http://127.0.0.1 " as the URL.

In your case, it would be:

var rest_url = "http://127.0.0.1:8000/rest/users/"
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For people who find this thread due to not being able to connect to localhost due to invalid certificate: in yours, URLSessionDelegate

you have to answer with the URLAuthenticationChallenge

following delegate method:

func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {

    func defaultAction() { completionHandler(.performDefaultHandling, nil) }

    // Due to localhost using an invalid certificate, we need to manually accept it and move on
    guard challenge.protectionSpace.host.hasPrefix("localhost") else { return defaultAction() }
    guard challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust else { return defaultAction() }
    guard let trust = challenge.protectionSpace.serverTrust else { return defaultAction() }

    completionHandler(.useCredential, URLCredential(trust: trust))
}
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