Problems with migration to Swift3, compilation error with URLSession.GET

Question

I'm trying to migrate from Swift2 to Swift3 and I'm having an issue with URLSession.GET

I went through the migration tool provided by XCode, and changed my "NSURLSession" calls into "URLSession" but I keep having this error message:

"Use of Instance member 'GET' on type 'URLSession'; did you mean to use a value of type 'URLSession' instead?"

Here is my code:

open static func getData() -> Promise<[Station]> {
   return URLSession.GET("http://api.xxx.gov/api/").asDataAndResponse().then { (data: NSData, _) -> [Station] in

     var stations = [Station]()
     // rest of the code to retrieve the data
     ...
     ...

     return stations
    }
}

Update: After some digging a found a solution, see answer below for more details and helpful links

Answer 1

After some more digging I found a solution :

First I have to init URLSession with a configuration:

let URLSession1 = URLSession(configuration: .default)

Then I can call the 'GET' method and I had to use (data,_ ) instead of (data:NSData,_ ):

open static func getData() -> Promise<[Station]> {
   return URLSession1.GET("http://api.xxx.com/api/").asDataAndResponse().then { (data, _) -> [Station] in

    var stations = [Station]()
    // rest of the code to retrieve the data
    ...
    ...
    return stations
  }
}

Some helpful StackOverflow links that helped me find the solution:

NSURLSession dataTaskForRequest:completion: unrecognized selector sent to instance