NSURLSessionUploadTask how to read server response

Question

I am using NSURLSessionUploadTask to upload a file.

Here are some parts of my code not complete

let session:NSURLSession = NSURLSession(configuration: config, delegate: self, delegateQueue: NSOperationQueue .mainQueue())

let sessionTask:NSURLSessionUploadTask = session.uploadTaskWithStreamedRequest(request

But the problem is I am unable to get the JSON response the server sends back.

The following delegate also not firing but other delegates are firing

func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData)

Code that I am using:

func sendFileToServer1(fileName:String,fileData:NSData,serverURL:String){

let body = NSMutableData()

let mimetype = "application/octet-stream"
//        let mimetype = "video/quicktime"

let boundary = "Boundary-\(NSUUID().UUIDString)"
let url = NSURL(string: serverURL)

let request = NSMutableURLRequest(URL: url!)
request.HTTPMethod = "POST"
request.setValue("multipart/form-data; boundary=----\(boundary)", forHTTPHeaderField: "Content-Type")
body.appendData("------\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
body.appendData("Content-Disposition:form-data; name=\"file\"; filename=\"\(fileName)\"\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
body.appendData("Content-Type: \(mimetype)\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
body.appendData(fileData)
body.appendData("\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
body.appendData("------\(boundary)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
body.appendData("Content-Disposition:form-data; name=\"submit\"\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
body.appendData("Submit\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
body.appendData("------\(boundary)--\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
request.HTTPBody=body

let config:NSURLSessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()
let session:NSURLSession = NSURLSession(configuration: config, delegate: self, delegateQueue: NSOperationQueue .mainQueue())
let sessionTask:NSURLSessionUploadTask = session.uploadTaskWithStreamedRequest(request)
sessionTask.resume()
}

func URLSession(session: NSURLSession, didBecomeInvalidWithError error: NSError?) {
    print("error")
 }

func URLSession(session: NSURLSession, task: NSURLSessionTask, didSendBodyData bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) {
    print("Bytes sent:\(bytesSent) Total bytes sent:\(totalBytesSent) Total bytes expected to send:\(totalBytesExpectedToSend)")
}

func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveResponse response: NSURLResponse, completionHandler: (NSURLSessionResponseDisposition) -> Void) {
    print("response:\(response as! NSHTTPURLResponse)")
}

func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData) {
    print("data didReceiveData")
}

I have conformed to the delegates

1. NSURLSessionDataDelegate
2. NSURLSessionDelegate
3. NSURLSessionTaskDelegate

Thanks

Answer 1

You shouldn't be using uploadTaskWithStreamedRequest: if you're creating the data when you create the request. That's intended for uploading huge chunks of data where you need to read the data from a file and encode it a bit at a time, sending it out a bit at a time. (And as mentioned, you have to provide the needNewBodyStream method if you do that.)

Chances are, you should be using uploadTaskWithRequest:fromData: and providing the body data blob as the fromData parameter.

You also don't need to set the body data in the request. NSURLSession ignores that as a rule.

You might also consider uploadTaskWithRequest:fromData:completionHandler:, which will let you specify a block to run with the entire data when the upload is finished, saving you from having to provide a delegate method to accumulate the data.