Add new queue method for checking the queue for a request with a given URL

Code/Network/RKRequestQueue.h

@@ -174,6 +174,13 @@
  */
 - (BOOL)containsRequest:(RKRequest *)request;
 
+/**
+ Determine if a request with the given URL is currently in this queue.
+
+ @param URL A URL to search the requests within the queue for.
+ @return YES if a request with the given URL is in this queue.
+ */
+- (BOOL)containsRequestWithURL:(NSURL *)URL;
 
 ///-----------------------------------------------------------------------------
 /// @name Processing Queued Requests

Code/Network/RKRequestQueue.m

@@ -409,6 +409,19 @@ static const NSTimeInterval kFlushDelay = 0.3;
     }
 }
 
+- (BOOL)containsRequestWithURL:(NSURL *)URL
+{
+    @synchronized(self) {
+        for (RKRequest *request in _requests) {
+            if ([request.URL isEqual:URL]) {
+                return YES;
+            }
+        }
+    }
+
+    return NO;
+}
+
 - (void)cancelRequest:(RKRequest *)request loadNext:(BOOL)loadNext
 {
     if ([request isUnsent]) {