Fix for inappropriate suspension of the main queue when using an IP address instead of a hostname.

Code/Network/RKClient.m

@@ -225,7 +225,7 @@ NSString* RKPathAppendQueryParams(NSString* resourcePath, NSDictionary* queryPar
         _baseURLReachabilityObserver = [[RKReachabilityObserver alloc] initWithHostname:[URL host]];
         
         // Suspend the queue until reachability to our new hostname is established
-        [RKRequestQueue sharedQueue].suspended = YES;
+        [RKRequestQueue sharedQueue].suspended = !_baseURLReachabilityObserver.reachabilityEstablished;
         [[NSNotificationCenter defaultCenter] addObserver:self 
                                                  selector:@selector(reachabilityWasDetermined:) 
                                                      name:RKReachabilityStateWasDeterminedNotification 

Code/Network/RKReachabilityObserver.h

@@ -40,6 +40,11 @@ typedef enum {
  */
 @property (nonatomic, readonly) NSString* hostName;
 
+/**
+ Returns YES if reachability has been determined
+ */
+@property (nonatomic, readonly) BOOL reachabilityEstablished;
+
 /**
  * Create a new reachability observer against a given hostname. The observer
  * will monitor the ability to reach the specified hostname and emit notifications

Code/Network/RKReachabilityObserver.m

@@ -45,7 +45,6 @@ static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReach
     if (!observer.reachabilityEstablished) {
         RKLogInfo(@"Network availability has been determined for reachability observer %@", observer);
         observer.reachabilityEstablished = YES;        
-        [[NSNotificationCenter defaultCenter] postNotificationName:RKReachabilityStateWasDeterminedNotification object:observer];
     }
 	
 	// Post a notification to notify the client that the network reachability changed.
@@ -223,7 +222,8 @@ static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReach
 }
 
 - (void)setReachabilityEstablished:(BOOL)reachabilityEstablished {
-    _reachabilityEstablished = reachabilityEstablished;    
+    _reachabilityEstablished = reachabilityEstablished;
+    [[NSNotificationCenter defaultCenter] postNotificationName:RKReachabilityStateWasDeterminedNotification object:self];
 }
 
 @end