NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
[dictionary setValue:@1 forKey:@"driverId"];
[dictionary setValue:@1 forKey:@"busId"];
[dictionary setValue:@1 forKey:@"lineId"];

NSData *postData = nil;
NSString *requestData = @"";
NSString *urlPath = @"myurl";
if([NSJSONSerialization isValidJSONObject:dictionary]){
    postData = [NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:nil];
    NSString *str = [[NSString alloc] initWithData:postData encoding:NSUTF8StringEncoding];
    requestData = [requestData stringByAppendingString:str];

    postData = [NSData dataWithBytes:[requestData UTF8String] length:[requestData length]];
}

NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
NSURL *url = [NSURL URLWithString:urlPath];

NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:postData];

NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *response = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];

NSDictionary *responseDic = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableLeaves error:&error];
NSString *status = [responseDic objectForKey:@"status"];