NSURLConnection switch to NSURLSession returning 404 response - objective-c

Question

I am attempting to convert my project from using NSURLConnection to NSURLSession. However, after making the switch I cannot seem to get a response from the server. The returned response from the server is always 404.
My original code, using NSURLConnection:
#implementation RecorderManager
- (void)sendRequestToURL:(NSString*)url withData:(NSData*)postData forScreen:(NSString *)inScreenName
{
RecorderAsynchSubmit* delegate = [[RecorderAsynchSubmit alloc] initWithScreenName:inScreenName andURL:url];
NSURLConnection *urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:delegate];
}
#implementation RecorderAsynchSubmit
// Implementing NSURLConnectionDelegate, NSURLConnectionDataDelegate
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
// Handle error
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[httpResponse setLength:0];
httpResponseCode = [((NSHTTPURLResponse *) response) statusCode];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)httpdata
{
[httpResponse appendData:httpdata];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *responseString = [[[NSString alloc] initWithData:httpResponse encoding:NSUTF8StringEncoding] copy];
if (httpResponseCode == STATUS_CODE_VALID) { // response code for entry submitted
responseString = #"Submit Succeeded";
} else {
responseString = [NSString stringWithFormat:#"Your entry could not be submitted. Data has been stored locally. Error Message: %#", responseString];
}
[[NSNotificationCenter defaultCenter]
postNotificationName:#"submissionCompleteEvent"
object:[[RecorderNotificationMessage alloc] initWithStatusMessage:responseString detailedMessage:responseString]];
}
My updated code using NSURLSessionTask:
#implementation RecorderManager
- (void)sendRequestToURL:(NSString*)url withData:(NSData*)postData forScreen:(NSString *)inScreenName
{
RecorderAsynchSubmit* delegate = [[RecorderAsynchSubmit alloc] initWithScreenName:inScreenName andURL:url];
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:delegate delegateQueue:nil];
NSURL *URL = [NSURL URLWithString:url];
NSURLSessionTask *task = [session dataTaskWithURL:URL];
[task resume];
}
#implementation RecorderAsynchSubmit
// Implementing NSURLSessionDelegate, NSURLSessionTaskDelegate, NSURLSessionDataDelegate
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response
completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler {
[httpResponse setLength:0];
httpResponseCode = [((NSHTTPURLResponse *) response) statusCode];
completionHandler(NSURLSessionResponseAllow);
}
-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveData:(NSData *)data {
[httpResponse appendData:data];
}
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
didCompleteWithError:(NSError *)error {
if (error) {
// Handle error
} else {
NSString *responseString = [[[NSString alloc] initWithData:httpResponse encoding:NSUTF8StringEncoding] copy];
if (httpResponseCode == STATUS_CODE_VALID) {
responseString = #"Submit Succeeded";
} else {
responseString = [NSString stringWithFormat:#"Your entry could not be submitted. Data has been stored locally. Error Message: %#", responseString];
}
[[NSNotificationCenter defaultCenter]
postNotificationName:#"submissionCompleteEvent"
object:[[RecorderNotificationMessage alloc] initWithStatusMessage:responseString detailedMessage:responseString]];
}
}
The original code is working fine and returns the expected result, however the updated code always returns a 404 response from the server.