Make an HTTP POST and read the response content into a string for further processing.

http-post.m

- ( NSString * ) loadFileHTTPFormPost : ( NSString * ) url withFormData : ( NSDictionary * ) parameters
{
    NSData * post;
    NSError * error;
    NSHTTPURLResponse * response;
    NSMutableString * location;
    NSMutableURLRequest * request;
    NSString * contents;
    NSString * form;
    
    // Form data
    form = [self encodeDictionary : parameters];
    NSLog( @"%@", form );
    
    location = [[NSMutableString alloc] init];
    
    // Send form data
    request = [[NSMutableURLRequest alloc] init];
    [request setURL : [NSURL URLWithString : url]];
    [request setHTTPMethod : @"POST"];
    [request setValue : [NSString stringWithFormat : @"%lu", [form length]] forHTTPHeaderField : @"Content-Length"];
    [request setValue : @"application/x-www-form-urlencoded" forHTTPHeaderField : @"Content-Type"];
    [request setHTTPBody : [form dataUsingEncoding : NSUTF8StringEncoding]];
    
    error = [[NSError alloc] init];
    
    response = nil;
    
    post = [NSURLConnection sendSynchronousRequest : request returningResponse : &response error : &error];
    
    if( [response statusCode] != 200 )
    {
        NSLog( @"Error making HTTP request: %@", error );
    } else {
        contents = [[NSString alloc] initWithData : post encoding:NSUTF8StringEncoding];
        NSLog( @"Form data response: %@", contents );
    }
    
    return contents;
}