diff --git a/AFNetworking/AFHTTPRequestOperation.h b/AFNetworking/AFHTTPRequestOperation.h
index 55c7a26..4e08bec 100644
--- a/AFNetworking/AFHTTPRequestOperation.h
+++ b/AFNetworking/AFHTTPRequestOperation.h
@@ -30,25 +30,26 @@ extern NSString * const AFHTTPOperationDidFinishNotification;
 
 @interface AFHTTPRequestOperation : NSOperation {
 @private    
-    NSURLConnection *_connection;
     NSSet *_runLoopModes;
     
+    NSURLConnection *_connection;
     NSURLRequest *_request;
     NSHTTPURLResponse *_response;
+    NSError *_error;
     
     NSData *_responseBody;
+    NSUInteger _totalBytesRead;
     NSMutableData *_dataAccumulator;
     NSOutputStream *_outputStream;
 }
 
-@property (nonatomic, retain) NSURLConnection *connection;
 @property (nonatomic, retain) NSSet *runLoopModes;
 
-@property (nonatomic, retain) NSURLRequest *request;
-@property (nonatomic, retain) NSHTTPURLResponse *response;
-@property (nonatomic, retain) NSError *error;
+@property (readonly, nonatomic, retain) NSURLRequest *request;
+@property (readonly, nonatomic, retain) NSHTTPURLResponse *response;
+@property (readonly, nonatomic, retain) NSError *error;
 
-@property (nonatomic, retain) NSData *responseBody;
+@property (readonly, nonatomic, retain) NSData *responseBody;
 @property (readonly) NSString *responseString;
 
 + (id)operationWithRequest:(NSURLRequest *)urlRequest 
diff --git a/AFNetworking/AFHTTPRequestOperation.m b/AFNetworking/AFHTTPRequestOperation.m
index 6ee3686..f81acda 100644
--- a/AFNetworking/AFHTTPRequestOperation.m
+++ b/AFNetworking/AFHTTPRequestOperation.m
@@ -78,8 +78,13 @@ static inline BOOL AFHTTPOperationStateTransitionIsValid(AFHTTPOperationState fr
 }
 
 @interface AFHTTPRequestOperation ()
-@property (nonatomic, assign) AFHTTPOperationState state;
-@property (nonatomic, assign, getter = isCancelled) BOOL cancelled;
+@property (readwrite, nonatomic, assign) AFHTTPOperationState state;
+@property (readwrite, nonatomic, assign, getter = isCancelled) BOOL cancelled;
+@property (readwrite, nonatomic, retain) NSURLConnection *connection;
+@property (readwrite, nonatomic, retain) NSURLRequest *request;
+@property (readwrite, nonatomic, retain) NSHTTPURLResponse *response;
+@property (readwrite, nonatomic, retain) NSError *error;
+@property (readwrite, nonatomic, retain) NSData *responseBody;
 @property (readwrite, nonatomic, assign) NSUInteger totalBytesRead;
 @property (readwrite, nonatomic, retain) NSMutableData *dataAccumulator;
 @property (readwrite, nonatomic, retain) NSOutputStream *outputStream;
@@ -200,7 +205,6 @@ static NSThread *_networkRequestThread = nil;
     self.downloadProgress = block;
 }
 
-
 - (void)setState:(AFHTTPOperationState)state {
     if (self.state == state) {
         return;