jlaw jlaw - 1 year ago 168
Swift Question

Swift: How to request a URL with a self-signed certificate?

I'm opening an SSL connection to retrieve JSON in Swift, but am testing against my own server with a self-signed certificate. Here's a snippet of the URL request:

var urlPath = "https://myhost.com/get_json"
var url: NSURL = NSURL(string: urlPath)
var request: NSURLRequest = NSURLRequest(URL: url)
var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)

However, it gets rejected (correctly) because of the certificate:

Opening connection to https://myhost.com/get_json
2014-06-05 09:37:02.543 AppName[44835:3182593] NSURLConnection/CFURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9813)
Connection failed.The certificate for this server is invalid. You might be connecting to a server that is pretending to be “myhost.com” which could put your confidential information at risk.## Heading ##

Answer Source

You will need these additional methods from NSURLConnectionDelegate:

func connection(connection: NSURLConnection, canAuthenticateAgainstProtectionSpace protectionSpace: NSURLProtectionSpace?) -> Bool
    return protectionSpace?.authenticationMethod == NSURLAuthenticationMethodServerTrust

func connection(connection: NSURLConnection, didReceiveAuthenticationChallenge challenge: NSURLAuthenticationChallenge?)
    if challenge?.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust
        if challenge?.protectionSpace.host == "www.myhost.com"
            let credentials = NSURLCredential(forTrust: challenge!.protectionSpace.serverTrust)
            challenge!.sender.useCredential(credentials, forAuthenticationChallenge: challenge)


NOTE: This is only possible when using the asynchronous NSURLConnection.

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