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diff --git a/indra/llcorehttp/_httpreplyqueue.h b/indra/llcorehttp/_httpreplyqueue.h
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+/**
+ * @file _httpreplyqueue.h
+ * @brief Internal declarations for the operation reply queue.
+ *
+ * $LicenseInfo:firstyear=2012&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2012, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef	_LLCORE_HTTP_REPLY_QUEUE_H_
+#define	_LLCORE_HTTP_REPLY_QUEUE_H_
+
+
+#include "_refcounted.h"
+#include "_mutex.h"
+
+
+namespace LLCore
+{
+
+
+class HttpOperation;
+
+
+/// Almost identical to the HttpRequestQueue class but
+/// whereas that class is a singleton and is known to the
+/// HttpService object, this queue is 1:1 with HttpRequest
+/// instances and isn't explicitly referenced by the
+/// service object.  Instead, HttpOperation objects that
+/// want to generate replies back to their creators also
+/// keep references to the corresponding HttpReplyQueue.
+/// The HttpService plumbing then simply delivers replies
+/// to the requested reply queue.
+///
+/// One result of that is that the fetch operations do
+/// not have a wait forever option.  The service object
+/// doesn't keep handles on everything it would need to
+/// notify so it can't wake up sleepers should it need to
+/// shutdown.  So only non-blocking or timed-blocking modes
+/// are anticipated.  These are how most application consumers
+/// will be coded anyway so it shouldn't be too much of a
+/// burden.
+
+class HttpReplyQueue: public LLCoreInt::RefCounted
+{
+public:
+	/// Caller acquires a Refcount on construction
+	HttpReplyQueue();
+	virtual ~HttpReplyQueue();
+
+private:
+	HttpReplyQueue(const HttpReplyQueue &);				// Not defined
+	void operator=(const HttpReplyQueue &);				// Not defined
+
+public:
+	typedef std::vector<HttpOperation *> OpContainer;
+
+	/// Insert an object at the back of the reply queue.
+	///
+	/// Library also takes possession of one reference count to pass
+	/// through the queue.
+	///
+	/// Threading:  callable by any thread.
+	void addOp(HttpOperation * op);
+
+	/// Fetch an operation from the head of the queue.  Returns
+	/// NULL if none exists.
+	///
+	/// Caller acquires reference count on returned operation.
+	///
+	/// Threading:  callable by any thread.
+	HttpOperation * fetchOp();
+
+	/// Caller acquires reference count on each returned operation
+	///
+	/// Threading:  callable by any thread.
+	void fetchAll(OpContainer & ops);
+	
+protected:
+	OpContainer							mQueue;
+	LLCoreInt::HttpMutex				mQueueMutex;
+	LLCoreInt::HttpConditionVariable	mQueueCV;
+	
+}; // end class HttpReplyQueue
+
+}  // end namespace LLCore
+
+
+#endif	// _LLCORE_HTTP_REPLY_QUEUE_H_