I'm getting Response: (null), I'm guessing there is something wrong with my request to instagram

-(void) like {

    NSURLSession *session = [NSURLSession sharedSession];
    NSString *accessToken = [[NSUserDefaults standardUserDefaults] objectForKey:@"accessToken"];
    NSString * urlString = [[NSString alloc] initWithFormat:@" https://api.instagram.com/v1/media/%@/likes?access_token=%@", self.photo[@"id"], accessToken];
    NSURL *url = [[NSURL alloc] initWithString:urlString];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
    request.HTTPMethod = @"POST";
    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSLog(@"Response: %@", response);
        NSLog(@"Data: %@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
    } ];
    [task resume];