HTTP(S) POST : connectionDidFinishLoading gets called with empty data, possible trust issue - ios

Question

I am trying to communicate with TSYS payment gateway which has an https server from my iOS application. My original code is given below.
-(void)postRequest:(NSString *)jsonBody{
NSData *requestData = [NSData dataWithBytes:[jsonBody UTF8String]
length:[jsonBody length]];
NSURL *url = [NSURL URLWithString:TSYS_URL];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url];
[request setHTTPMethod:#"POST"];
[request setValue:[NSString stringWithFormat:#"%d",[requestData length]]
forHTTPHeaderField:#"Content-Length"];
[request setValue:#"*/*" forHTTPHeaderField:#"Accept"];
[request setHTTPBody:requestData];
[[NSURLConnection alloc]initCustomURLWithRequest:request delegate:self ];
}
- (void)connection:(NSURLConnection *)connection
didReceiveResponse:(NSURLResponse *)response{
NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
int code = [httpResponse statusCode];
NSLog(#"http error code : %d", code);
[self.receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection
didReceiveData:(NSData *)data {
[self.receivedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSLog(#"receivedData.length : %d", [self.receivedData length]);
connection = nil;
}
- (void)connection:(NSURLConnection *)connection
didFailWithError:(NSError *)error {
connection = nil;
}
The payment gateway url is
#define TSYS_URL #"https://stagegw.transnox.com/servlets/TransNox_API_Server"
And I get this in console
http error code : 404
receivedData.length : 0
When I saw the log, the first port of call was about HTTPS SSL authentication, so I wrote a android project that do POST by trusting all certificate (not ideal, I know), and hurray I was getting correct response. But when I removed the part that enables HttpClient to trust all certificates, I got empty response(in Android).
To make iOS trust all certificate, I added below code
- (BOOL)connection:(NSURLConnection *)connection
canAuthenticateAgainstProtectionSpace:
(NSURLProtectionSpace *)protectionSpace {
//This always returns true
return [protectionSpace.authenticationMethod
isEqualToString:NSURLAuthenticationMethodServerTrust];
}
- (void)connection:(NSURLConnection *)connection
didReceiveAuthenticationChallenge:
(NSURLAuthenticationChallenge *)challenge {
if([challenge.protectionSpace.authenticationMethod
isEqualToString:NSURLAuthenticationMethodServerTrust]){
NSURLCredential *credential = [NSURLCredential
credentialForTrust:challenge.protectionSpace.serverTrust];
[challenge.sender useCredential:credential
forAuthenticationChallenge:challenge];
}
[challenge.sender
continueWithoutCredentialForAuthenticationChallenge:challenge];
}
Still I get the same error.
Ok my questions are
First and foremost, why is this not working? I need to get this
working , so that I can move forward with project. Since my project
is in beginning state, I don't mind if the solution is to trust all
certificates. I somehow need to get server talking.
The type of authentication challenge I am getting is
NSURLAuthenticationMethodServerTrust. Ideally I should get the
server issued certificate and make my NSURLConnection object trust
it. How could I get the certificate file from server?

Answer 1

I got it working at last. In the end, it was not an issue with authentication. Along with the all the code above, I had to pass a header field "User-Agent" with the request. When I passed it I started to get response from the server.