twitter.m

#import <Foundation/Foundation.h>

int main(void) {
  NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
  
  NSURL* url = [NSURL URLWithString:@"https://twitter.com/"];
  NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url];
  [request setHTTPMethod:@"HEAD"];
  
  NSHTTPURLResponse* response;
  NSError* error;
  [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
  
  if (error != nil || [response statusCode] != 200) {
    NSLog(@"FAIL! (error = %@, status code = %i)", error, [response statusCode]);
  } else {
    NSLog(@"SUCCESS!");
  }
  
  [pool release];
}