NSURLErrorDomain Code=-1001 error when a http post request is sent

Question

I am using the following code to post an image to my server.

@IBAction func postButtonPressed(sender: UIButton) {
    let task = NSURLSession.sharedSession().dataTaskWithRequest(createRequest("http://xx.xx.xxx.xxx/xxxx/"), completionHandler: {
        data, response, error in
        println(NSString(data: data, encoding: NSUTF8StringEncoding))
    })
    task.resume()
}

where createRequest() creates the required NSURLRequest object.

This works fine when I use a simulator. The problem is that I am getting the following error when I run my app on an iPhone.

Error Domain=NSURLErrorDomain Code=-1001 "The operation couldn’t be completed. (NSURLErrorDomain error -1001.)" UserInfo=0x155e71f0 {NSErrorFailingURLKey=http://xx.xxx.xxx.xxx/xxxx/, NSErrorFailingURLStringKey=http://54.148.156.117/query/, NSUnderlyingError=0x155674d0 "The operation couldn’t be completed. (kCFErrorDomainCFNetwork error -1001.)"}

I have learned that this error is a timeout error. Restarting the app or phone didn't helped. Moreover I have tried posting an image to my server from a web browser and it worked with no problem.

What might be causing this timeout error?

EDIT: When I monitor my network activity, I realized the app sends 10 MB data even though the image that I am sending is 0.1 MB.

Answer 1

Apparently my post request was getting a timeout error since I was sending an image that the server would find too large. I scaled down the images in order to make my images acceptable by the server.

As this post suggests, NSURLErrorDomain Code=-1001 error might be caused by many things including;

• Server response time limit
• Server rules about the incoming data
• Authentication problems

Hope that helps to other people