Objective c 将数据发布到Webservice URL

我在向webservice发布数据时遇到了代码问题

谁能告诉我哪里出了问题

我需要将三个字段（doctorId字符串、patientId.STRING、date字符串）发布到此地址：

如何使之正确

NSString *post = [NSString stringWithFormat:@"&id_doktor=%@&id_pacijent=%@&datum=%@",@"iddoktora",@"idpacijenta",@"ovojedatum"];
NSData* postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

//You need to send the actual length of your data. Calculate the length of the post string.
NSString *postLength = [NSString stringWithFormat:@”%d”,[postData length]];

//Create URLRequest object and initialize it.
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

//Set the Url for which your going to send the data to that request
[request setURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://www.walter-dev.com/doctor/public/setTermin"]]];

//set HTTP method (POST)
[request setHTTPMethod:@"POST"];

//Set header field with lenght of the post data
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

//I dont understand this line of code
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Current-Type"];


//Set httpbody of the urlrequest with string "post"
[request setHTTPBody:postData];

//Initialize object with urlRequest
NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self];

if(conn)
{
    NSLog(@"Konekcija prema serveru je uspjela");
}
else
{
    NSLog(@"NIJE USPJELA ");
}

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