diff --git a/AFNetworking/AFHTTPClient.h b/AFNetworking/AFHTTPClient.h
index 687b9fd..e3d13b1 100644
--- a/AFNetworking/AFHTTPClient.h
+++ b/AFNetworking/AFHTTPClient.h
@@ -113,15 +113,7 @@ extern NSString * AFQueryStringFromParametersWithEncoding(NSDictionary *paramete
     [NSURL URLWithString:@"http://example2.com/" relativeToURL:baseURL];    // http://example2.com/
 
  */
-@interface AFHTTPClient : NSObject {
-@private
-    NSURL *_baseURL;
-    NSStringEncoding _stringEncoding;
-    AFHTTPClientParameterEncoding _parameterEncoding;
-    NSMutableArray *_registeredHTTPOperationClassNames;
-    NSMutableDictionary *_defaultHeaders;
-    NSOperationQueue *_operationQueue;
-}
+@interface AFHTTPClient : NSObject
 
 ///---------------------------------------
 /// @name Accessing HTTP Client Properties
diff --git a/AFNetworking/AFHTTPRequestOperation.h b/AFNetworking/AFHTTPRequestOperation.h
index 122099e..d906129 100644
--- a/AFNetworking/AFHTTPRequestOperation.h
+++ b/AFNetworking/AFHTTPRequestOperation.h
@@ -26,14 +26,7 @@
 /**
  `AFHTTPRequestOperation` is a subclass of `AFURLConnectionOperation` for requests using the HTTP or HTTPS protocols. It encapsulates the concept of acceptable status codes and content types, which determine the success or failure of a request.
  */
-@interface AFHTTPRequestOperation : AFURLConnectionOperation {
-@private
-    NSIndexSet *_acceptableStatusCodes;
-    NSSet *_acceptableContentTypes;
-    NSError *_HTTPError;
-    dispatch_queue_t _successCallbackQueue;
-    dispatch_queue_t _failureCallbackQueue;
-}
+@interface AFHTTPRequestOperation : AFURLConnectionOperation
 
 ///----------------------------------------------
 /// @name Getting HTTP URL Connection Information
diff --git a/AFNetworking/AFImageRequestOperation.h b/AFNetworking/AFImageRequestOperation.h
index 7456d5f..7a7f78a 100644
--- a/AFNetworking/AFImageRequestOperation.h
+++ b/AFNetworking/AFImageRequestOperation.h
@@ -49,15 +49,7 @@
  - `image/x-xbitmap`
  - `image/x-win-bitmap`
  */
-@interface AFImageRequestOperation : AFHTTPRequestOperation {
-@private
-#if __IPHONE_OS_VERSION_MIN_REQUIRED
-    UIImage *_responseImage;
-    CGFloat _imageScale;
-#elif __MAC_OS_X_VERSION_MIN_REQUIRED
-    NSImage *_responseImage;
-#endif
-}
+@interface AFImageRequestOperation : AFHTTPRequestOperation
 
 /**
  An image constructed from the response data. If an error occurs during the request, `nil` will be returned, and the `error` property will be set to the error.
diff --git a/AFNetworking/AFJSONRequestOperation.h b/AFNetworking/AFJSONRequestOperation.h
index 7c6a579..a1191f9 100644
--- a/AFNetworking/AFJSONRequestOperation.h
+++ b/AFNetworking/AFJSONRequestOperation.h
@@ -35,11 +35,7 @@
 
  @warning JSON parsing will automatically use JSONKit, SBJSON, YAJL, or NextiveJSON, if provided. Otherwise, the built-in `NSJSONSerialization` class is used, if available (iOS 5.0 and Mac OS 10.7). If the build target does not either support `NSJSONSerialization` or include a third-party JSON library, a runtime exception will be thrown when attempting to parse a JSON request. 
  */
-@interface AFJSONRequestOperation : AFHTTPRequestOperation {
-@private
-    id _responseJSON;
-    NSError *_JSONError;
-}
+@interface AFJSONRequestOperation : AFHTTPRequestOperation
 
 ///----------------------------
 /// @name Getting Response Data
diff --git a/AFNetworking/AFPropertyListRequestOperation.h b/AFNetworking/AFPropertyListRequestOperation.h
index 150041c..aa6e471 100644
--- a/AFNetworking/AFPropertyListRequestOperation.h
+++ b/AFNetworking/AFPropertyListRequestOperation.h
@@ -32,13 +32,7 @@
  
  - `application/x-plist`
  */
-@interface AFPropertyListRequestOperation : AFHTTPRequestOperation {
-@private
-    id _responsePropertyList;
-    NSPropertyListFormat _propertyListFormat;
-    NSPropertyListReadOptions _propertyListReadOptions;
-    NSError *_propertyListError;
-}
+@interface AFPropertyListRequestOperation : AFHTTPRequestOperation
 
 ///----------------------------
 /// @name Getting Response Data
diff --git a/AFNetworking/AFURLConnectionOperation.h b/AFNetworking/AFURLConnectionOperation.h
index 14d0226..bef89dc 100644
--- a/AFNetworking/AFURLConnectionOperation.h
+++ b/AFNetworking/AFURLConnectionOperation.h
@@ -75,24 +75,7 @@ extern NSString * const AFNetworkingOperationDidFinishNotification;
  
  @warning Attempting to load a `file://` URL in iOS 4 may result in an `NSInvalidArgumentException`, caused by the connection returning `NSURLResponse` rather than `NSHTTPURLResponse`, which is the behavior as of iOS 5.
  */
-@interface AFURLConnectionOperation : NSOperation {
-@private
-    unsigned short _state;
-    BOOL _cancelled;
-    NSRecursiveLock *_lock;
-    
-    NSSet *_runLoopModes;
-    
-    NSURLConnection *_connection;
-    NSURLRequest *_request;
-    NSHTTPURLResponse *_response;
-    NSError *_error;
-
-    NSData *_responseData;
-    NSInteger _totalBytesRead;
-    NSMutableData *_dataAccumulator;
-    NSOutputStream *_outputStream;
-}
+@interface AFURLConnectionOperation : NSOperation
 
 ///-------------------------------
 /// @name Accessing Run Loop Modes
diff --git a/AFNetworking/AFURLConnectionOperation.m b/AFNetworking/AFURLConnectionOperation.m
index 172595a..fe520e2 100644
--- a/AFNetworking/AFURLConnectionOperation.m
+++ b/AFNetworking/AFURLConnectionOperation.m
@@ -85,6 +85,7 @@ static inline BOOL AFStateTransitionIsValid(AFOperationState fromState, AFOperat
 
 @interface AFURLConnectionOperation ()
 @property (readwrite, nonatomic, assign) AFOperationState state;
+@property (readwrite, nonatomic, assign, getter = isCancelled) BOOL cancelled;
 @property (readwrite, nonatomic, retain) NSRecursiveLock *lock;
 @property (readwrite, nonatomic, retain) NSURLConnection *connection;
 @property (readwrite, nonatomic, retain) NSURLRequest *request;
@@ -106,6 +107,7 @@ static inline BOOL AFStateTransitionIsValid(AFOperationState fromState, AFOperat
 
 @implementation AFURLConnectionOperation
 @synthesize state = _state;
+@synthesize cancelled = _cancelled;
 @synthesize connection = _connection;
 @synthesize runLoopModes = _runLoopModes;
 @synthesize request = _request;
@@ -304,10 +306,6 @@ static inline BOOL AFStateTransitionIsValid(AFOperationState fromState, AFOperat
     return self.state == AFHTTPOperationFinishedState;
 }
 
-- (BOOL)isCancelled {
-    return _cancelled;
-}
-
 - (BOOL)isConcurrent {
     return YES;
 }
diff --git a/AFNetworking/AFXMLRequestOperation.h b/AFNetworking/AFXMLRequestOperation.h
index 7fa919d..0beb677 100644
--- a/AFNetworking/AFXMLRequestOperation.h
+++ b/AFNetworking/AFXMLRequestOperation.h
@@ -39,14 +39,7 @@
  
  When `AFXMLRequestOperation` is registered with `AFHTTPClient`, the response object in the success callback of `HTTPRequestOperationWithRequest:success:failure:` will be an instance of `NSXMLParser`. On platforms that support `NSXMLDocument`, you have the option to ignore the response object, and simply use the `responseXMLDocument` property of the operation argument of the callback.
  */
-@interface AFXMLRequestOperation : AFHTTPRequestOperation {
-@private
-    NSXMLParser *_responseXMLParser;
-#if __MAC_OS_X_VERSION_MIN_REQUIRED
-    NSXMLDocument *_responseXMLDocument;
-#endif
-    NSError *_XMLError;
-}
+@interface AFXMLRequestOperation : AFHTTPRequestOperation
 
 ///----------------------------
 /// @name Getting Response Data