fix cancel crash in latest version of asi

Classes/ASIHTTPRequest.m

@@ -2098,14 +2098,20 @@ - (void)failWithError:(NSError *)theError
 		return;
 	}
 
-	// If we have cached data, use it and ignore the error when using ASIFallbackToCacheIfLoadFailsCachePolicy
-	if ([self downloadCache] && ([self cachePolicy] & ASIFallbackToCacheIfLoadFailsCachePolicy)) {
-		if ([[self downloadCache] canUseCachedDataForRequest:self]) {
-			[self useDataFromCache];
-			return;
-		}
-	}
-
+
+    //Use possible cached data ONLY when  the request is not manually cancelled.
+    //`useDataFromCache` will mark the request as finished. If we are not in progress, we can't notify the queue we've finished(doing so can cause a crash later on).
+    // It's similar to  https://github.com/jogu/asi-http-request/commit/887fcad0f77e9717f003273612804a9b9012a140
+    if(theError != ASIRequestCancelledError){
+       	// If we have cached data, use it and ignore the error when using ASIFallbackToCacheIfLoadFailsCachePolicy
+        if ([self downloadCache] && ([self cachePolicy] & ASIFallbackToCacheIfLoadFailsCachePolicy)) {
+            if ([[self downloadCache] canUseCachedDataForRequest:self]) {
+                [self useDataFromCache];
+                return;
+            }
+        }
+    }
+
 
 	[self setError:theError];
 

README.textile

@@ -1,32 +1,9 @@
-ASIHTTPRequest is an easy to use wrapper around the CFNetwork API that makes some of the more tedious aspects of communicating with web servers easier. It is written in Objective-C and works in both Mac OS X and iPhone applications.
+This fixes occasional crash when you cancel an ASIHTTPRequest.  
 
-It is suitable performing basic HTTP requests and interacting with REST-based services (GET / POST / PUT / DELETE). The included ASIFormDataRequest subclass makes it easy to submit POST data and files using multipart/form-data.
 
-It provides:
-* A straightforward interface for submitting data to and fetching data from webservers
-* Download data to memory or directly to a file on disk
-* Submit files on local drives as part of POST data, compatible with the HTML file input mechanism
-* Stream request bodies directly from disk to the server, to conserve memory
-* Resume for partial downloads
-* Easy access to request and response HTTP headers
-* Progress delegates (NSProgressIndicators and UIProgressViews) to show information about download AND upload progress
-* Auto-magic management of upload and download progress indicators for operation queues
-* Basic, Digest + NTLM authentication support, credentials are automatically re-used for the duration of a session, and can be stored for later in the Keychain.
-* Cookie support
-* [NEW] Requests can continue to run when your app moves to the background (iOS 4+)
-* GZIP support for response data AND request bodies
-* The included ASIDownloadCache class lets requests transparently cache responses, and allow requests for cached data to succeed even when there is no network available
-* [NEW] ASIWebPageRequest - download complete webpages, including external resources like images and stylesheets. Pages of any size can be indefinitely cached, and displayed in a UIWebview / WebView even when you have no network connection.
-* Easy to use support for Amazon S3 - no need to fiddle around signing requests yourself!
-* Full support for Rackspace Cloud Files
-* [NEW] Client certificates support
-* Supports manual and auto-detected proxies, authenticating proxies, and PAC file auto-configuration. The built-in login dialog lets your iPhone application work transparently with authenticating proxies without any additional effort.
-* Bandwidth throttling support
-* Support for persistent connections
-* Supports synchronous & asynchronous requests
-* Get notifications about changes in your request state via delegation or [NEW] blocks (Mac OS X 10.6, iOS 4 and above)
-* Comes with a broad range of unit tests
+The crash can be reproduced when you cancel a request that satisfies:  
 
-ASIHTTPRequest is compatible with Mac OS 10.5 or later, and iOS 3.0 or later.
+* currently waiting in queue, not been started yet 
+* there is valid cached data for this request in downloadCache  
 
-Documentation is available "here":http://allseeing-i.com/ASIHTTPRequest.
+The fix is similar to [jogu@887fcad](https://github.com/jogu/asi-http-request/commit/887fcad0f77e9717f003273612804a9b9012a140). That's, avoid calling markAsFinished unless we're in progress.