NSURLConnection Delegate methods not getting called after two times - ios

Question

I am sending a request to server using NSURLConnection, it worked for 2 times , since third time it is not working, delegates are not being called. What i found during debugging is connectionShouldUseCredentialStorage method is called for initial times, third time it was not called and rest of methods are also not called.
Here is my code:
NSString *requestString = [NSString stringWithFormat:#"%#", [serviceParameters JSONFragment], nil];
NSData *requestData = [NSData dataWithBytes: [requestString UTF8String] length: [requestString length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: strUrl]];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-type"];
[request setHTTPBody:requestData];
[NSURLConnection connectionWithRequest:urlRequest delegate:self];
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
self.data = [NSMutableData data];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)aData
{
[self.data appendData:aData];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
SBJSON *jsonParser = [[SBJSON new] autorelease];
NSString *jsonString = [[[NSString alloc] initWithData:self.data encoding:NSUTF8StringEncoding] autorelease];
NSError *outError = nil;
id result = [jsonParser objectWithString:jsonString error:&outError];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
if([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust])
{
[challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];
}
[challenge.sender continueWithoutCredentialForAuthenticationChallenge:challenge];
}
- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace
{
if( [[protectionSpace authenticationMethod] isEqualToString:NSURLAuthenticationMethodServerTrust] )
{
return YES;
}
return NO;
}
- (BOOL)connectionShouldUseCredentialStorage:(NSURLConnection *)connection
{
return YES;
}

Answer 1

in .h
NSMutableData * data;
NSURLConnection *connection;
Also add Add
in .m
-(void) startConnection
{
NSString *requestString = [NSString stringWithFormat:#"http://md5.jsontest.com/?text=Pushkraj"];
NSData *requestData = [NSData dataWithBytes: [requestString UTF8String] length: [requestString length]];
NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:requestString]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
data = [NSMutableData dataWithCapacity:0];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-type"];
[request setHTTPBody:requestData];
connection=[[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
data = [NSMutableData data];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)aData
{
[data appendData:aData];
NSDictionary * dataDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
NSLog(#"dataDict : %#",dataDict);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(#"connectionDidFinishLoading");
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(#"Error : %#",error);
}
Call [self startConnection]; wherever you want means on viewDidLoad or on UIButton Click

Answer 2

You forgot to start connection. You are not saving the reference to NSURLConnection for starting the connection. So replace last line
[NSURLConnection connectionWithRequest:urlRequest delegate:self];
with this
NSURLConnection *cn =[NSURLConnection connectionWithRequest:urlRequest delegate:self];
[cn start];
Hope it helps.