send parameter values and retrieve an xml file Xcode

Question

In my current xcode project, I need to send parameter values to a url and need to retrieve an xml file based on the parameter values sent.

I tried the below code but it's not working:

(IBAction)myButtonClick:(id)sender 
{

    NSURL *oRequestURL = 
        [NSURL URLWithString:@"http://xyz .com/air/1.0/search?from=MAA&to=CJB&depart-date=2012-06-30&adults=2&children=2&infants=1&way=one&cabin-type=Economy&sort=asc"];

    NSMutableURLRequest *oRequest = [[[NSMutableURLRequest alloc]init]autorelease];

    [oRequest setHTTPMethod:@"POST"];
    [oRequest setURL: oRequestURL];

    NSMutableData *oHttpBody = [NSMutableData data];
    [oHttpBody appendData:[@"This is HTTP Request body" dataUsingEncoding:NSUTF8StringEncoding]];

    [oRequest setValue:[oHttpBody length] forHTTPHeaderField:@"Content-Length"];

    NSError *oError = [[NSError alloc]init];
    NSHTTPURLResponse *oResponseCode = nil;
    NSData *oResponseData = [NSURLConnection sendSynchronousRequest:oRequest returningResponse:oResponseCode error:oError];

    if ([oResponseCode statusCode]> 200) {
        NSLog(@"Status code is greater than 200");        
    }

    NSString *strResult=[[NSString alloc]initWithData:oResponseData encoding:NSUTF8StringEncoding];
    NSLog(@"The result is %s",strResult);

}

I have searched many sites and books but could not find a solution. Would be of great help if a link to a tutorial or some other useful resource can be provided. Appreciate your great help.

Thank You.

Hi, I have found the solution. The code is as below. Hope it helps someone else:)

- (IBAction)myButtonPressed:(id)sender 
{

    NSString *urlAsString = @"http://api.abc.com/air/1.0/search?from=MAA&to=CJB&depart-date=2012-09-30&adults=2&children=2&infants=1&way=one&cabin-type=Economy&sort=asc";


    NSURL *url = [NSURL URLWithString:urlAsString];


    NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];


    [urlRequest setValue:@"2193141de2g7e2a34bb19bc3aa52b3b5" forHTTPHeaderField:@"X-XX-API-KEY"];

    [urlRequest setTimeoutInterval:30.0f];
    [urlRequest setHTTPMethod:@"GET"];


    NSOperationQueue *queue  = [[NSOperationQueue alloc]init];

    [NSURLConnection 
     sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) 
    {
         if ([data length]>0 &&
             error == nil)
         {
             NSString *html = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
             NSLog(@"HTML = %@", html);
         }

         else if ([data length]== 0 && error==nil) {
             NSLog(@"Nothing was downloaded");
         }
     else if (error!= nil) {
         NSLog(@"Error occured = %@", error);
     }


     }];
}