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diff --git a/indra/llmessage/llavatarnamecache.h b/indra/llmessage/llavatarnamecache.h
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+/** 
+ * @file llavatarnamecache.h
+ * @brief Provides lookup of avatar SLIDs ("bobsmith123") and display names
+ * ("James Cook") from avatar UUIDs.
+ *
+ * $LicenseInfo:firstyear=2010&license=viewergpl$
+ * 
+ * Copyright (c) 2010, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+#ifndef LLAVATARNAMECACHE_H
+#define LLAVATARNAMECACHE_H
+
+#include "llavatarname.h"	// for convenience
+
+#include <boost/signals2.hpp>
+
+class LLSD;
+class LLUUID;
+
+namespace LLAvatarNameCache
+{
+	// Until the cache is set running, immediate lookups will fail and
+	// async lookups will be queued.  This allows us to block requests
+	// until we know if the first region supports display names.
+	void initClass(bool running);
+	void cleanupClass();
+
+	void importFile(std::istream& istr);
+	void exportFile(std::ostream& ostr);
+
+	// On the viewer, usually a simulator capabilitity
+	// If empty, name cache will fall back to using legacy name
+	// lookup system
+	void setNameLookupURL(const std::string& name_lookup_url);
+
+	// Do we have a valid lookup URL, hence are we trying to use the
+	// new display name lookup system?
+	bool hasNameLookupURL();
+	
+	// Periodically makes a batch request for display names not already in
+	// cache.  Call once per frame.
+	void idle();
+
+	// If name is in cache, returns true and fills in provided LLAvatarName
+	// otherwise returns false
+	bool get(const LLUUID& agent_id, LLAvatarName *av_name);
+
+	// Callback types for get() below
+	typedef boost::signals2::signal<
+		void (const LLUUID& agent_id, const LLAvatarName& av_name)>
+			callback_signal_t;
+	typedef callback_signal_t::slot_type callback_slot_t;
+
+	// Fetches name information and calls callback.
+	// If name information is in cache, callback will be called immediately.
+	void get(const LLUUID& agent_id, callback_slot_t slot);
+
+	// Allow display names to be explicitly disabled for testing.
+	void setUseDisplayNames(bool use);
+	bool useDisplayNames();
+
+	void erase(const LLUUID& agent_id);
+
+	// Force a re-fetch of the most recent data, but keep the current
+	// data in cache
+	void fetch(const LLUUID& agent_id);
+
+	void insert(const LLUUID& agent_id, const LLAvatarName& av_name);
+
+	// Compute name expiration time from HTTP Cache-Control header,
+	// or return default value, in seconds from epoch.
+	F64 nameExpirationFromHeaders(LLSD headers);
+}
+
+// Parse a cache-control header to get the max-age delta-seconds.
+// Returns true if header has max-age param and it parses correctly.
+// Exported here to ease unit testing.
+bool max_age_from_cache_control(const std::string& cache_control, S32 *max_age);
+
+#endif