如何在Xcode Playground上使用Charles Proxy？

Question

When tying out network requests from a Swift playground, I can't see the network call in Charles Proxy. However, it works when I do network requests from an iOS simulator by following the steps in the answer here .

Would be nice to make it work for Xcode Playgrounds for faster iteration. Does anyone know what needs to be done to make it work there?

Answer 1

I found a gist that describes a way to make it work with Playgrounds. It circumvents the need to alter the ATS settings. Create an object conforming to URLSessionDelegate with the following implementation:

public class NetworkEnabler: NSObject, NSURLSessionDelegate {
    public func URLSession(session: NSURLSession, didReceiveChallenge challenge: NSURLAuthenticationChallenge, completionHandler: (NSURLSessionAuthChallengeDisposition, NSURLCredential?) -> Void) {
        completionHandler(.UseCredential, NSURLCredential(trust: challenge.protectionSpace.serverTrust!))
    }
}

and create a session with an instance as its delegate: URLSession(configuration: .default, delegate: enabler, delegateQueue: nil) . Using that session for requests will allow you to use Charles.

Answer 2

Swift 5 version of fruitcoder's answer:

public class NetworkEnabler: NSObject, URLSessionDelegate {
    public func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
        completionHandler(.useCredential, URLCredential(trust: challenge.protectionSpace.serverTrust!))
    }
}

Then to initialize the URLSession:

let session = URLSession(configuration: .default, delegate: NetworkEnabler(), delegateQueue: nil)

Answer 3

Unlike the simulator, Playgrounds don't have their own network configuration. If you need a proxy on a Playground then you need to proxy your Mac's network connection. That will affect every app on your Mac, which is potentially a lot of data. It should work but you might want to quit any other network-related apps that you can. If you don't need to use your browser while testing, for example, quit it until you're done.