title: Instrument (XCode4) report ASIHttpRequest leak memory?
body: <p>I get Instrument tools in XCode 4 report memory leaks from ASIHttpRequest... I didn't be able to figure out the problem, turned our I commented out all my code to handle the result and make the function like below, but xcode still report the same memory leak...</p>
  
  <p>This method is called everytime when I click a button, and I will see more memory leak happen every time when I hit the button. :(</p>
  
  <pre><code>- (void) loadData
  {
      // no data set, we need to load ourself
      NSURL *url = [self getDataUrl];
      ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
  
      ////////////////////////////////////////////////////////////////////
      // set cache policy
      //
  
      // always store data in cache
      [request setCacheStoragePolicy:ASICachePermanentlyCacheStoragePolicy];
      // Always ask the server if there is new content available, 
      // If the request fails, use data from the cache even if it should have expired.
      [request setCachePolicy:ASIAskServerIfModifiedWhenStaleCachePolicy|ASIFallbackToCacheIfLoadFailsCachePolicy];
  
  
      [request setCompletionBlock:^{
          NSLog(@"[http request] finishing %@", url);
  
          [self dataDidLoadSuccess];
      }];
  
      [request setFailedBlock:^{
          NSError *error = [request error];
          NSLog(@"[http request]Failed to perform request to %@: %@", url, error);
          [self dataDidLoadFail:error];
      }];
  
      [request startAsynchronous];  
  }
  </code></pre>
  
  <hr>
  
  <p>Following is copied from Instrument detected leaks (only a part):</p>
  
  <pre><code>Leaked Object   #   Address Size    Responsible Library Responsible Frame
  __NSMallocBlock__,2 &lt; multiple &gt;    64 Bytes    UIKit   -[UIViewController view]
  NSCFString,2    &lt; multiple &gt;    64 Bytes    CFNetwork   HTTPMessage::parseHeadersFromData()
  GeneralBlock-16,2   &lt; multiple &gt;    32 Bytes    Foundation  -[NSThread main]
  NSRecursiveLock,2   &lt; multiple &gt;    160 Bytes   Foundation  +[NSRecursiveLock allocWithZone:]
  NSConcreteMutableData,2 &lt; multiple &gt;    64 Bytes    Foundation  +[NSMutableData(NSMutableData) allocWithZone:]
  __NSArrayM,2    &lt; multiple &gt;    64 Bytes    UIKit   -[UIViewController view]
  __NSMallocBlock__,2 &lt; multiple &gt;    64 Bytes    UIKit   -[UIViewController view]
  __NSArrayM,2    &lt; multiple &gt;    64 Bytes    Foundation  +[NSHTTPCookie _cf2nsCookies:]
  __NSOperationInternal,2 &lt; multiple &gt;    288 Bytes   Foundation  -[NSOperation init]
  NSCFString,     0xb35fdc0   16 Bytes    CFNetwork   createCapitalizedHeaderString
  NSCFString,     0xb35fda0   32 Bytes    CFNetwork   HTTPMessage::extractResponseStatusLine(unsigned char const*, long)
  GeneralBlock-32,    0xb35cd10   32 Bytes    CFNetwork   HTTPMessage::internalSetHeader(__CFString const*, __CFString const*, long)
  __NSCFArray,    0xb35c550   32 Bytes    CFNetwork   HTTPReadStream::streamEvent(unsigned long)
  GeneralBlock-48,    0xb35c520   48 Bytes    CFNetwork   HTTPReadStream::startRequest(CFStreamError*)
  GeneralBlock-16,    0xb35c440   16 Bytes    CFNetwork   HTTPReadStream::startRequest(CFStreamError*)
  __NSCFInputStream,  0xb35c420   32 Bytes    CFNetwork   HTTPReadStream::startRequest(CFStreamError*)
  GeneralBlock-32,    0xb35ba80   32 Bytes    CFNetwork   HTTPReadStream::constructProxyList(CFStreamError*)
  __NSCFArray,    0xb35ba60   32 Bytes    CFNetwork   HTTPReadStream::constructProxyList(CFStreamError*)
  GeneralBlock-48,    0xb35ba10   48 Bytes    CFNetwork   HTTPMessage::initialize(HTTPMessage*)
  CFHTTPMessage,  0xb35b950   80 Bytes    CFNetwork   HTTPReadStream::streamOpen(__CFReadStream*, CFStreamError*, unsigned char*)
  GeneralBlock-48,    0xb35b920   48 Bytes    Foundation  -[NSThread main]
  __NSCFArray,    0xb35b900   32 Bytes    CFNetwork   HTTPMessage::initialize(HTTPMessage*)
  __NSCFArray,    0xb35b8e0   32 Bytes    Foundation  -[NSThread main]
  __NSCFArray,    0xb35b8c0   32 Bytes    CFNetwork   HTTPReadStream::startRequest(CFStreamError*)
  GeneralBlock-48,    0xb35b610   48 Bytes    Foundation  -[NSThread main]
  GeneralBlock-16,    0xb35b5f0   16 Bytes    CFNetwork   HTTPReadStream::streamSetProperty(__CFReadStream*, __CFString const*, void const*)
  GeneralBlock-32,    0xb35b5d0   32 Bytes    Foundation  -[NSThread main]
  GeneralBlock-32,    0xb35b5b0   32 Bytes    Foundation  -[NSThread main]
  NSCFString,     0xb35b590   32 Bytes    Foundation  -[NSURL(NSURL) host]
  GeneralBlock-16,    0xb35b570   16 Bytes    CFNetwork   HTTPReadStream::streamSetProperty(__CFReadStream*, __CFString const*, void const*)
  __NSCFDictionary,   0xb35b540   48 Bytes    Foundation  -[NSThread main]
  __NSCFDictionary,   0xb35b490   48 Bytes    CFNetwork
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/5yoc5.png" alt="Screenshot"></p>