title: ARC with ASIHTTPRequest
body: <p>I'm using iOS SDK 5 to develop apps and I'm trying to use ARC. But I need to use <code>ASIHTTPRequest</code> and it's not ARC-enabled. Apple's doc said it's OK to use ARC file-based. So I compile all <code>ASIHTTPRequest</code> files with <code>-fno-objc-arc</code>. I write the following code in my class, which is using ARC:</p>
  
  <pre><code>NSURL *url = [[NSURL alloc] initWithString:urlStr];
  ASIHTTPRequest *req = [[ASIHTTPRequest alloc] initWithURL:url];
  req.delegate = self;
  [req startAsynchronous];
  </code></pre>
  
  <p>but after executing the first line, the url is nil. What's wrong or how to use manually managed code in ARC project? Thanks.</p>