NSURLConnection not return data - objective-c

Question

I Have a NSURLConnection that has been working for a while and all of a sudden is not working.
For some reason, the only delegate method that gets called is:
-(void)connection:(NSURLConnection *)connection didReceiveResponse:
None of the other delegate methods get called. I have other classes which uses pretty much the same code, just a different request and url and they all seem to work fine. I have read alot of post that talk about making sure the connection is on the same thread as the delegate etc but nothing seems to work for me. I know the server is returning a response because if I pass the same information through a simple html form I get a response in my browser, and I can see evidence that my server side script is running because I can see the changes it is making in the SQL data. And the app is getting some sort of resonse, its just not getting any data or calling the connectionDidFinishLoading delegate method.
Any ideas of what the problem might be?
Here is a simplified version on my code:
#import "RegistrationViewController.h"
#interface RegistrationViewController ()
#end
NSMutableData *responseData;
NSURLConnection *theconnection;
#implementation RegistrationViewController
/*
* Attempt to Register online. Returns False if valiation failed
*/
- (BOOL) registerOnline{
// OTHER CODE HERE TO BUILD DATA FOR THE REQUEST
// URL Request
NSURL *requestUrl = [NSURL URLWithString:THEURL];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:requestUrl];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:[NSData dataWithBytes:[bodyData UTF8String] length:strlen([bodyData UTF8String])]];
// Initialse Response Object
responseData = [[NSMutableData alloc] init];
// Conection
theconnection = [NSURLConnection connectionWithRequest:request delegate:self];
[theconnection start];
return YES;
}
/*
* Handle the event of registration failing
*/
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
NSLog(#"didFailWithError");
// OTHER CODE HERE TO HANDLE THE ERROR....
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
NSLog(#"did receive response ");
}
/*
* Handle the reciept of Data
*/
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
NSLog(#"didReceiveData");
// Add data to the response
[responseData appendData:data];\
}
/*
* Data finnished loading
*/
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSLog(#"connectionDidFinishLoading");
// OTHER CODE HERE TO HANDLE THE RESPONSE....
}

Answer 1

You should look at the response and diagnose what's going on. For example, if statusCode is not 200, you might have a problem. See the HTTP/1.1 Status Code Definitions.
So, you might check the statusCode:
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
NSInteger statusCode = [(NSHTTPURLResponse *)response statusCode];
if (statusCode == 200) {
NSLog(#"received successful (200) response ");
} else {
NSLog(#"whoops, something wrong, received status code of %d", statusCode);
}
} else {
NSLog(#"Not a HTTP response");
}
}
You're also calling:
theconnection = [NSURLConnection connectionWithRequest:request delegate:self];
That starts the connection automatically. By calling
[theconnection start];
you're starting it a second time. Remove the start method, or use initWithRequest:delegate:startImmediately: with NO for that final parameter.

Answer 2

If it can help anybody, the problem for me was that i was starting the connection in an another thread
So be sure to call
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
or
theconnection = [NSURLConnection connectionWithRequest:request delegate:self];
[theconnection start];
in the main thread.