Swift 3 URLSession sending empty request

Question

I can't get the URLSession to send anything in the body of a POST request.

Here is my code:

// Set up the request
var request = URLRequest(url: URL(string: baseURL + url)!)
request.httpMethod = "POST"
let jsonData = try JSONSerialization.data(withJSONObject: values,
                                                  options: .prettyPrinted)
request.httpBody = jsonData
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
let config = URLSessionConfiguration.ephemeral
let session = URLSession(configuration: config, delegate: self, delegateQueue: OperationQueue.main)
let task = session.dataTask(with: request) { data, response, err in
    if let err = err {
        print(err)
    }
    else {
        let jsondata = data!
        do {
            let sessionData =
                        try JSONSerialization.jsonObject(with: jsondata, options: .mutableLeaves)
                            as? Dictionary<String, String>
            callback.taskComplete(response: sessionData, task: task)
        }
        catch {
            print(error)
        }
    }
}
task.resume()

The server receives the request, but the body is empty and the content type header is null. I can't use the default session because I'm developing with self-signed certificates, so I need my class to be a URLSession delegate.

I'm using Swift 3, XCode 8, and iOS 10. Any help would be appreciated.

Answer 1

Problem solved. It was a combination of errors. If the URL doesn't have the trailing "/", Jetty sends a 302 redirect to the same URL with the slash appended. The iOS client does the redirect with a "GET," so there is nothing in the body. When I add the trailing "/", the request works fine.

I hope this answer will help someone doing iOS development. I searched Google for hours before I posted this question. I finally found the answer in a post about the Apache Java HttpClient. It has the same behavior.

Thank you for all the responses.