NSURLConnection data received after connectionDidFinishLoading - iphone

Question

I have a question about NSURLConnection:
I want download an image with:
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];
the first delegate called (correctly) is
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
after this is called one time:
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
and immediately:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
up to here everything is correct, but after connectionDidFinishLoading is fired once again the didReceiveData delegate for the same connection, I identify connection by:
NSString * connectionKey = [[[connection originalRequest] URL] absoluteString];
Is this possible?
update, more infos:
My app fire many simultaneous connections and I store infos for any connection in a dictionary, when a delegate was called I retrive connection info using the key: NSString * connectionKey = [[[connection originalRequest] URL] absoluteString]; for 99% of connections everything is all right but for one (avery time the same!) connection I have this behavior
here the complete implementation:
- (void)downloadFileFromUrl:(NSURL *)url
inPath:(NSString *)completeFilePath
dataReceivedBlock:(void (^)(long long byteDownloaded ,long long totalByte))dataReceivedBlock
endBlock:(void (^)(NSString * downloadPath, NSDictionary * responseHeaders))endBlock
failBlock:(void (^)(NSString * downloadPath, NSDictionary * responseHeaders, NSError * error))failBlock
{
//save the connection infos
NSMutableDictionary * requestData = [[NSMutableDictionary alloc] init];
if(dataReceivedBlock)
[requestData setObject:[dataReceivedBlock copy] forKey:#"dataReceivedBlock"];
if(endBlock)
[requestData setObject:[endBlock copy] forKey:#"endBlock"];
if(failBlock)
[requestData setObject:[failBlock copy] forKey:#"failBlock"];
[requestData setObject:[NSNumber numberWithBool:YES] forKey:#"usingBlock"];
[requestData setObject: completeFilePath forKey:#"downloadDestinationPath"];
//delete the file if already on fs
if([[NSFileManager defaultManager] fileExistsAtPath: completeFilePath])
[[NSFileManager defaultManager] removeItemAtPath:completeFilePath error:nil];
// Create the request.
NSURLRequest * urlRequest = [NSURLRequest requestWithURL:url cachePolicy:NSURLCacheStorageAllowed timeoutInterval:TIME_OUT];
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];
if (!theConnection)
{
// Inform the user that the connection failed.
failBlock(completeFilePath,nil,[NSError errorWithDomain:#"Connection fail" code:0 userInfo:nil]);
}
//add connection infos to the requests dictionary
NSString * connectionKey = [[[theConnection originalRequest] URL] absoluteString];
[self.requests setObject:requestData forKey:connectionKey];
}
here a delegate example:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString * connectionKey = [[[connection originalRequest] URL] absoluteString];
NSMutableDictionary * requestData = [self.requests objectForKey:connectionKey];
NSFileHandle *file = [requestData objectForKey:#"fileHandle"];
[file closeFile];
//se la richiesta usa o no block
BOOL usingBlock = [[requestData objectForKey:#"usingBlock"] boolValue];
if(usingBlock)
{
__block void (^endBlock)(NSString * , NSDictionary *) = [requestData objectForKey:#"endBlock"];
if(endBlock)
endBlock([requestData objectForKey:#"downloadDestinationPath"],[requestData objectForKey:#"responseHeaders"]);
}
else
[self.delegate downloadEnded:[requestData objectForKey:#"responseHeaders"]];
//elimino dati richiesta
[self.requests removeObjectForKey:[NSString stringWithFormat:#"%#",connectionKey]];
//Inibisco standby
[UIApplication sharedApplication].idleTimerDisabled = NO;
}

Answer 1

It's impossible. It's must be different connection callback.
ensure each connection use unique delegate, or unique switch branch in the same delegate.

Answer 2

Obviously the solution is really simple -_-
The error is in the connection key identifier:
NSString * connectionKey = [[[connection originalRequest] URL] absoluteString];
my assumption is that key are unique, but if I make x parallel downloadS for the same file at the same url the assumption is wrong ;)