merge changes for 3.7.19-release

13 files changed, 674 insertions, 138 deletions

diff --git a/indra/llcorehttp/README.Linden b/indra/llcorehttp/README.Linden
index eb6ccab3bc..c3aaa9158d 100644
--- a/indra/llcorehttp/README.Linden
+++ b/indra/llcorehttp/README.Linden
@@ -529,6 +529,14 @@ HttpOperation::addAsReply: TRACE, ToReplyQueue, Handle:  086D3148
         data = NULL;
 
 
+    There are now helper functions in llmessage/llcorehttputil.h to
+    assist with LLSD usage.  requestPostWithLLSD(...) provides a
+    requestPost()-like interface that takes an LLSD object rather than
+    a BufferArray.  And responseToLLSD(...) attempts to convert a
+    BufferArray received from a server into an LLSD object.  You can
+    find examples in llmeshrepository.cpp, llinventorymodel.cpp,
+    llinventorymodelbackgroundfetch.cpp and lltexturefetch.cpp.
+
     LLSD will often go hand-in-hand with BufferArray and data
     transport.  But you can also do all the streaming I/O you'd expect
     of a std::iostream object:
diff --git a/indra/llcorehttp/_httpinternal.h b/indra/llcorehttp/_httpinternal.h
index f80d7f60f5..a2a60ca056 100755
--- a/indra/llcorehttp/_httpinternal.h
+++ b/indra/llcorehttp/_httpinternal.h
@@ -145,8 +145,11 @@ const int HTTP_CONNECTION_LIMIT_DEFAULT = 8;
 const int HTTP_CONNECTION_LIMIT_MIN = 1;
 const int HTTP_CONNECTION_LIMIT_MAX = 256;
 
-// Miscellaneous defaults
+// Pipelining limits
 const long HTTP_PIPELINING_DEFAULT = 0L;
+const long HTTP_PIPELINING_MAX = 20L;
+
+// Miscellaneous defaults
 const bool HTTP_USE_RETRY_AFTER_DEFAULT = true;
 const long HTTP_THROTTLE_RATE_DEFAULT = 0L;
 
diff --git a/indra/llcorehttp/_httplibcurl.cpp b/indra/llcorehttp/_httplibcurl.cpp
index e56bc84174..81b44ab90b 100755
--- a/indra/llcorehttp/_httplibcurl.cpp
+++ b/indra/llcorehttp/_httplibcurl.cpp
@@ -4,7 +4,7 @@
  *
  * $LicenseInfo:firstyear=2012&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2012-2013, Linden Research, Inc.
+ * Copyright (C) 2012-2014, 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
@@ -33,6 +33,17 @@
 
 #include "llhttpconstants.h"
 
+namespace
+{
+
+// Error testing and reporting for libcurl status codes
+void check_curl_multi_code(CURLMcode code);
+void check_curl_multi_code(CURLMcode code, int curl_setopt_option);
+
+static const char * const LOG_CORE("CoreHttp");
+
+} // end anonymous namespace
+
 
 namespace LLCore
 {
@@ -40,16 +51,18 @@ namespace LLCore
 
 HttpLibcurl::HttpLibcurl(HttpService * service)
 	: mService(service),
+	  mHandleCache(),
 	  mPolicyCount(0),
 	  mMultiHandles(NULL),
-	  mActiveHandles(NULL)
+	  mActiveHandles(NULL),
+	  mDirtyPolicy(NULL)
 {}
 
 
 HttpLibcurl::~HttpLibcurl()
 {
 	shutdown();
-	
+
 	mService = NULL;
 }
 
@@ -81,6 +94,9 @@ void HttpLibcurl::shutdown()
 
 		delete [] mActiveHandles;
 		mActiveHandles = NULL;
+
+		delete [] mDirtyPolicy;
+		mDirtyPolicy = NULL;
 	}
 
 	mPolicyCount = 0;
@@ -95,11 +111,18 @@ void HttpLibcurl::start(int policy_count)
 	mPolicyCount = policy_count;
 	mMultiHandles = new CURLM * [mPolicyCount];
 	mActiveHandles = new int [mPolicyCount];
+	mDirtyPolicy = new bool [mPolicyCount];
 	
 	for (int policy_class(0); policy_class < mPolicyCount; ++policy_class)
 	{
-		mMultiHandles[policy_class] = curl_multi_init();
+		if (NULL == (mMultiHandles[policy_class] = curl_multi_init()))
+		{
+			LL_ERRS(LOG_CORE) << "Failed to allocate multi handle in libcurl."
+							  << LL_ENDL;
+		}
 		mActiveHandles[policy_class] = 0;
+		mDirtyPolicy[policy_class] = false;
+		policyUpdated(policy_class);
 	}
 }
 
@@ -117,8 +140,19 @@ HttpService::ELoopSpeed HttpLibcurl::processTransport()
 	// Give libcurl some cycles to do I/O & callbacks
 	for (int policy_class(0); policy_class < mPolicyCount; ++policy_class)
 	{
-		if (! mActiveHandles[policy_class] || ! mMultiHandles[policy_class])
+		if (! mMultiHandles[policy_class])
+		{
+			// No handle, nothing to do.
+			continue;
+		}
+		if (! mActiveHandles[policy_class])
 		{
+			// If we've gone quiet and there's a dirty update, apply it,
+			// otherwise we're done.
+			if (mDirtyPolicy[policy_class])
+			{
+				policyUpdated(policy_class);
+			}
 			continue;
 		}
 		
@@ -153,9 +187,9 @@ HttpService::ELoopSpeed HttpLibcurl::processTransport()
 			}
 			else
 			{
-				LL_WARNS_ONCE("CoreHttp") << "Unexpected message from libcurl.  Msg code:  "
-										  << msg->msg
-										  << LL_ENDL;
+				LL_WARNS_ONCE(LOG_CORE) << "Unexpected message from libcurl.  Msg code:  "
+										<< msg->msg
+										<< LL_ENDL;
 			}
 			msgs_in_queue = 0;
 		}
@@ -184,23 +218,28 @@ void HttpLibcurl::addOp(HttpOpRequest * op)
 	}
 
 	// Make the request live
-	curl_multi_add_handle(mMultiHandles[op->mReqPolicy], op->mCurlHandle);
+	CURLMcode code;
+	code = curl_multi_add_handle(mMultiHandles[op->mReqPolicy], op->mCurlHandle);
+	if (CURLM_OK != code)
+	{
+		// *TODO:  Better cleanup and recovery but not much we can do here.
+		check_curl_multi_code(code);
+		return;
+	}
 	op->mCurlActive = true;
+	mActiveOps.insert(op);
+	++mActiveHandles[op->mReqPolicy];
 	
 	if (op->mTracing > HTTP_TRACE_OFF)
 	{
 		HttpPolicy & policy(mService->getPolicy());
 		
-		LL_INFOS("CoreHttp") << "TRACE, ToActiveQueue, Handle:  "
-							 << static_cast<HttpHandle>(op)
-							 << ", Actives:  " << mActiveOps.size()
-							 << ", Readies:  " << policy.getReadyCount(op->mReqPolicy)
-							 << LL_ENDL;
+		LL_INFOS(LOG_CORE) << "TRACE, ToActiveQueue, Handle:  "
+						   << static_cast<HttpHandle>(op)
+						   << ", Actives:  " << mActiveOps.size()
+						   << ", Readies:  " << policy.getReadyCount(op->mReqPolicy)
+						   << LL_ENDL;
 	}
-	
-	// On success, make operation active
-	mActiveOps.insert(op);
-	++mActiveHandles[op->mReqPolicy];
 }
 
 
@@ -241,16 +280,16 @@ void HttpLibcurl::cancelRequest(HttpOpRequest * op)
 
 	// Detach from multi and recycle handle
 	curl_multi_remove_handle(mMultiHandles[op->mReqPolicy], op->mCurlHandle);
-	curl_easy_cleanup(op->mCurlHandle);
+	mHandleCache.freeHandle(op->mCurlHandle);
 	op->mCurlHandle = NULL;
 
 	// Tracing
 	if (op->mTracing > HTTP_TRACE_OFF)
 	{
-		LL_INFOS("CoreHttp") << "TRACE, RequestCanceled, Handle:  "
-							 << static_cast<HttpHandle>(op)
-							 << ", Status:  " << op->mStatus.toTerseString()
-							 << LL_ENDL;
+		LL_INFOS(LOG_CORE) << "TRACE, RequestCanceled, Handle:  "
+						   << static_cast<HttpHandle>(op)
+						   << ", Status:  " << op->mStatus.toTerseString()
+						   << LL_ENDL;
 	}
 
 	// Cancel op and deliver for notification
@@ -267,18 +306,18 @@ bool HttpLibcurl::completeRequest(CURLM * multi_handle, CURL * handle, CURLcode
 
 	if (handle != op->mCurlHandle || ! op->mCurlActive)
 	{
-		LL_WARNS("CoreHttp") << "libcurl handle and HttpOpRequest handle in disagreement or inactive request."
-							 << "  Handle:  " << static_cast<HttpHandle>(handle)
-							 << LL_ENDL;
+		LL_WARNS(LOG_CORE) << "libcurl handle and HttpOpRequest handle in disagreement or inactive request."
+						   << "  Handle:  " << static_cast<HttpHandle>(handle)
+						   << LL_ENDL;
 		return false;
 	}
 
 	active_set_t::iterator it(mActiveOps.find(op));
 	if (mActiveOps.end() == it)
 	{
-		LL_WARNS("CoreHttp") << "libcurl completion for request not on active list.  Continuing."
-							 << "  Handle:  " << static_cast<HttpHandle>(handle)
-							 << LL_ENDL;
+		LL_WARNS(LOG_CORE) << "libcurl completion for request not on active list.  Continuing."
+						   << "  Handle:  " << static_cast<HttpHandle>(handle)
+						   << LL_ENDL;
 		return false;
 	}
 
@@ -309,25 +348,25 @@ bool HttpLibcurl::completeRequest(CURLM * multi_handle, CURL * handle, CURLcode
 		}
 		else
 		{
-			LL_WARNS("CoreHttp") << "Invalid HTTP response code ("
-								 << http_status << ") received from server."
-								 << LL_ENDL;
+			LL_WARNS(LOG_CORE) << "Invalid HTTP response code ("
+							   << http_status << ") received from server."
+							   << LL_ENDL;
 			op->mStatus = HttpStatus(HttpStatus::LLCORE, HE_INVALID_HTTP_STATUS);
 		}
 	}
 
 	// Detach from multi and recycle handle
 	curl_multi_remove_handle(multi_handle, handle);
-	curl_easy_cleanup(handle);
+	mHandleCache.freeHandle(op->mCurlHandle);
 	op->mCurlHandle = NULL;
 
 	// Tracing
 	if (op->mTracing > HTTP_TRACE_OFF)
 	{
-		LL_INFOS("CoreHttp") << "TRACE, RequestComplete, Handle:  "
-							 << static_cast<HttpHandle>(op)
-							 << ", Status:  " << op->mStatus.toTerseString()
-							 << LL_ENDL;
+		LL_INFOS(LOG_CORE) << "TRACE, RequestComplete, Handle:  "
+						   << static_cast<HttpHandle>(op)
+						   << ", Status:  " << op->mStatus.toTerseString()
+						   << LL_ENDL;
 	}
 
 	// Dispatch to next stage
@@ -351,6 +390,164 @@ int HttpLibcurl::getActiveCountInClass(int policy_class) const
 	return mActiveHandles ? mActiveHandles[policy_class] : 0;
 }
 
+void HttpLibcurl::policyUpdated(int policy_class)
+{
+	if (policy_class < 0 || policy_class >= mPolicyCount || ! mMultiHandles)
+	{
+		return;
+	}
+	
+	HttpPolicy & policy(mService->getPolicy());
+	
+	if (! mActiveHandles[policy_class])
+	{
+		// Clear to set options.  As of libcurl 7.37.0, if a pipelining
+		// multi handle has active requests and you try to set the
+		// multi handle to non-pipelining, the library gets very angry
+		// and goes off the rails corrupting memory.  A clue that you're
+		// about to crash is that you'll get a missing server response
+		// error (curl code 9).  So, if options are to be set, we let
+		// the multi handle run out of requests, then set options, and
+		// re-enable request processing.
+		//
+		// All of this stall mechanism exists for this reason.  If
+		// libcurl becomes more resilient later, it should be possible
+		// to remove all of this.  The connection limit settings are fine,
+		// it's just that pipelined-to-non-pipelined transition that
+		// is fatal at the moment.
+		
+		HttpPolicyClass & options(policy.getClassOptions(policy_class));
+		CURLM * multi_handle(mMultiHandles[policy_class]);
+		CURLMcode code;
+
+		// Enable policy if stalled
+		policy.stallPolicy(policy_class, false);
+		mDirtyPolicy[policy_class] = false;
+		
+		if (options.mPipelining > 1)
+		{
+			// We'll try to do pipelining on this multihandle
+			code = curl_multi_setopt(multi_handle,
+									 CURLMOPT_PIPELINING,
+									 1L);
+			check_curl_multi_code(code, CURLMOPT_PIPELINING);
+			code = curl_multi_setopt(multi_handle,
+									 CURLMOPT_MAX_PIPELINE_LENGTH,
+									 long(options.mPipelining));
+			check_curl_multi_code(code, CURLMOPT_MAX_PIPELINE_LENGTH);
+			code = curl_multi_setopt(multi_handle,
+									 CURLMOPT_MAX_HOST_CONNECTIONS,
+									 long(options.mPerHostConnectionLimit));
+			check_curl_multi_code(code, CURLMOPT_MAX_HOST_CONNECTIONS);
+			code = curl_multi_setopt(multi_handle,
+									 CURLMOPT_MAX_TOTAL_CONNECTIONS,
+									 long(options.mConnectionLimit));
+			check_curl_multi_code(code, CURLMOPT_MAX_TOTAL_CONNECTIONS);
+		}
+		else
+		{
+			code = curl_multi_setopt(multi_handle,
+									 CURLMOPT_PIPELINING,
+									 0L);
+			check_curl_multi_code(code, CURLMOPT_PIPELINING);
+			code = curl_multi_setopt(multi_handle,
+									 CURLMOPT_MAX_HOST_CONNECTIONS,
+									 0L);
+			check_curl_multi_code(code, CURLMOPT_MAX_HOST_CONNECTIONS);
+			code = curl_multi_setopt(multi_handle,
+									 CURLMOPT_MAX_TOTAL_CONNECTIONS,
+									 long(options.mConnectionLimit));
+			check_curl_multi_code(code, CURLMOPT_MAX_TOTAL_CONNECTIONS);
+		}
+	}
+	else if (! mDirtyPolicy[policy_class])
+	{
+		// Mark policy dirty and request a stall in the policy.
+		// When policy goes idle, we'll re-invoke this method
+		// and perform the change.  Don't allow this thread to
+		// sleep while we're waiting for quiescence, we'll just
+		// stop processing.
+		mDirtyPolicy[policy_class] = true;
+		policy.stallPolicy(policy_class, true);
+	}
+}
+
+// ---------------------------------------
+// HttpLibcurl::HandleCache
+// ---------------------------------------
+
+HttpLibcurl::HandleCache::HandleCache()
+	: mHandleTemplate(NULL)
+{
+	mCache.reserve(50);
+}
+
+
+HttpLibcurl::HandleCache::~HandleCache()
+{
+	if (mHandleTemplate)
+	{
+		curl_easy_cleanup(mHandleTemplate);
+		mHandleTemplate = NULL;
+	}
+
+	for (handle_cache_t::iterator it(mCache.begin()); mCache.end() != it; ++it)
+	{
+		curl_easy_cleanup(*it);
+	}
+	mCache.clear();
+}
+
+
+CURL * HttpLibcurl::HandleCache::getHandle()
+{
+	CURL * ret(NULL);
+	
+	if (! mCache.empty())
+	{
+		// Fastest path to handle
+		ret = mCache.back();
+		mCache.pop_back();
+	}
+	else if (mHandleTemplate)
+	{
+		// Still fast path
+		ret = curl_easy_duphandle(mHandleTemplate);
+	}
+	else
+	{
+		// When all else fails
+		ret = curl_easy_init();
+	}
+
+	return ret;
+}
+
+
+void HttpLibcurl::HandleCache::freeHandle(CURL * handle)
+{
+	if (! handle)
+	{
+		return;
+	}
+
+	curl_easy_reset(handle);
+	if (! mHandleTemplate)
+	{
+		// Save the first freed handle as a template.
+		mHandleTemplate = handle;
+	}
+	else
+	{
+		// Otherwise add it to the cache
+		if (mCache.size() >= mCache.capacity())
+		{
+			mCache.reserve(mCache.capacity() + 50);
+		}
+		mCache.push_back(handle);
+	}
+}
+
 
 // ---------------------------------------
 // Free functions
@@ -376,3 +573,29 @@ struct curl_slist * append_headers_to_slist(const HttpHeaders * headers, struct
 
 
 }  // end namespace LLCore
+
+
+namespace 
+{
+	
+void check_curl_multi_code(CURLMcode code, int curl_setopt_option)
+{
+	if (CURLM_OK != code)
+	{
+		LL_WARNS(LOG_CORE) << "libcurl multi error detected:  " << curl_multi_strerror(code)
+						   << ", curl_multi_setopt option:  " << curl_setopt_option
+						   << LL_ENDL;
+	}
+}
+
+
+void check_curl_multi_code(CURLMcode code)
+{
+	if (CURLM_OK != code)
+	{
+		LL_WARNS(LOG_CORE) << "libcurl multi error detected:  " << curl_multi_strerror(code)
+						   << LL_ENDL;
+	}
+}
+
+}  // end anonymous namespace
diff --git a/indra/llcorehttp/_httplibcurl.h b/indra/llcorehttp/_httplibcurl.h
index 67f98dd4f0..ffc24c63a8 100755
--- a/indra/llcorehttp/_httplibcurl.h
+++ b/indra/llcorehttp/_httplibcurl.h
@@ -4,7 +4,7 @@
  *
  * $LicenseInfo:firstyear=2012&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2012-2013, Linden Research, Inc.
+ * Copyright (C) 2012-2014, 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
@@ -116,6 +116,31 @@ public:
 	/// Threading:  called by worker thread.
 	bool cancel(HttpHandle handle);
 
+	/// Informs transport that a particular policy class has had
+	/// options changed and so should effect any transport state
+	/// change necessary to effect those changes.  Used mainly for
+	/// initialization and dynamic option setting.
+	///
+	/// Threading:  called by worker thread.
+	void policyUpdated(int policy_class);
+
+	/// Allocate a curl handle for caller.  May be freed using
+	/// either the freeHandle() method or calling curl_easy_cleanup()
+	/// directly.
+	///
+	/// @return			Libcurl handle (CURL *) or NULL on allocation
+	///					problem.  Handle will be in curl_easy_reset()
+	///					condition.
+	///
+	/// Threading:  callable by worker thread.
+	///
+	/// Deprecation:  Expect this to go away after _httpoprequest is
+	/// refactored bringing code into this class.
+	CURL * getHandle()
+		{
+			return mHandleCache.getHandle();
+		}
+
 protected:
 	/// Invoked when libcurl has indicated a request has been processed
 	/// to completion and we need to move the request to a new state.
@@ -127,13 +152,68 @@ protected:
 	
 protected:
 	typedef std::set<HttpOpRequest *> active_set_t;
+
+	/// Simple request handle cache for libcurl.
+	///
+	/// Handle creation is somewhat slow and chunky in libcurl and there's
+	/// a pretty good speedup to be had from handle re-use.  So, a simple
+	/// vector is kept of 'freed' handles to be reused as needed.  When
+	/// that is empty, the first freed handle is kept as a template for
+	/// handle duplication.  This is still faster than creation from nothing.
+	/// And when that fails, we init fresh from curl_easy_init().
+	///
+	/// Handles allocated with getHandle() may be freed with either
+	/// freeHandle() or curl_easy_cleanup().  Choice may be dictated
+	/// by thread constraints.
+	///
+	/// Threading:  Single-threaded.  May only be used by a single thread,
+	/// typically the worker thread.  If freeing requests' handles in an
+	/// unknown threading context, use curl_easy_cleanup() for safety.
+
+	class HandleCache
+	{
+	public:
+		HandleCache();
+		~HandleCache();
+
+	private:
+		HandleCache(const HandleCache &);				// Not defined
+		void operator=(const HandleCache &);			// Not defined
+
+	public:
+		/// Allocate a curl handle for caller.  May be freed using
+		/// either the freeHandle() method or calling curl_easy_cleanup()
+		/// directly.
+		///
+		/// @return			Libcurl handle (CURL *) or NULL on allocation
+		///					problem.
+		///
+		/// Threading:  Single-thread (worker) only.
+		CURL * getHandle();
+
+		/// Free a libcurl handle acquired by whatever means.  Thread
+		/// safety is left to the caller.
+		///
+		/// Threading:  Single-thread (worker) only.
+		void freeHandle(CURL * handle);
+
+	protected:
+		typedef std::vector<CURL *> handle_cache_t;
+	
+	protected:
+		CURL *				mHandleTemplate;		// Template for duplicating new handles
+		handle_cache_t		mCache;					// Cache of old handles
+	}; // end class HandleCache
 	
 protected:
-	HttpService *		mService;				// Simple reference, not owner
+	HttpService *		mService;			// Simple reference, not owner
+	HandleCache			mHandleCache;		// Handle allocator, owner
 	active_set_t		mActiveOps;
 	int					mPolicyCount;
-	CURLM **			mMultiHandles;			// One handle per policy class
-	int *				mActiveHandles;			// Active count per policy class
+	CURLM **			mMultiHandles;		// One handle per policy class
+	int *				mActiveHandles;		// Active count per policy class
+	bool *				mDirtyPolicy;		// Dirty policy update waiting for stall (per pc)
+	
 }; // end class HttpLibcurl
 
 }  // end namespace LLCore
diff --git a/indra/llcorehttp/_httpoperation.cpp b/indra/llcorehttp/_httpoperation.cpp
index 5bb0654652..fefe561f80 100755
--- a/indra/llcorehttp/_httpoperation.cpp
+++ b/indra/llcorehttp/_httpoperation.cpp
@@ -4,7 +4,7 @@
  *
  * $LicenseInfo:firstyear=2012&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2012-2013, Linden Research, Inc.
+ * Copyright (C) 2012-2014, 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
@@ -38,6 +38,14 @@
 #include "lltimer.h"
 
 
+namespace
+{
+
+static const char * const LOG_CORE("CoreHttp");
+
+} // end anonymous namespace
+
+
 namespace LLCore
 {
 
@@ -94,8 +102,8 @@ void HttpOperation::stageFromRequest(HttpService *)
 	// Default implementation should never be called.  This
 	// indicates an operation making a transition that isn't
 	// defined.
-	LL_ERRS("CoreHttp") << "Default stageFromRequest method may not be called."
-						<< LL_ENDL;
+	LL_ERRS(LOG_CORE) << "Default stageFromRequest method may not be called."
+					  << LL_ENDL;
 }
 
 
@@ -104,8 +112,8 @@ void HttpOperation::stageFromReady(HttpService *)
 	// Default implementation should never be called.  This
 	// indicates an operation making a transition that isn't
 	// defined.
-	LL_ERRS("CoreHttp") << "Default stageFromReady method may not be called."
-						<< LL_ENDL;
+	LL_ERRS(LOG_CORE) << "Default stageFromReady method may not be called."
+					  << LL_ENDL;
 }
 
 
@@ -114,8 +122,8 @@ void HttpOperation::stageFromActive(HttpService *)
 	// Default implementation should never be called.  This
 	// indicates an operation making a transition that isn't
 	// defined.
-	LL_ERRS("CoreHttp") << "Default stageFromActive method may not be called."
-						<< LL_ENDL;
+	LL_ERRS(LOG_CORE) << "Default stageFromActive method may not be called."
+					  << LL_ENDL;
 }
 
 
@@ -145,9 +153,9 @@ void HttpOperation::addAsReply()
 {
 	if (mTracing > HTTP_TRACE_OFF)
 	{
-		LL_INFOS("CoreHttp") << "TRACE, ToReplyQueue, Handle:  "
-							 << static_cast<HttpHandle>(this)
-							 << LL_ENDL;
+		LL_INFOS(LOG_CORE) << "TRACE, ToReplyQueue, Handle:  "
+						   << static_cast<HttpHandle>(this)
+						   << LL_ENDL;
 	}
 	
 	if (mReplyQueue)
diff --git a/indra/llcorehttp/_httpoprequest.cpp b/indra/llcorehttp/_httpoprequest.cpp
index 43dd069bc6..fbbb1614fb 100755
--- a/indra/llcorehttp/_httpoprequest.cpp
+++ b/indra/llcorehttp/_httpoprequest.cpp
@@ -4,7 +4,7 @@
  *
  * $LicenseInfo:firstyear=2012&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2012-2013, Linden Research, Inc.
+ * Copyright (C) 2012-2014, 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
@@ -47,6 +47,19 @@
 #include "llhttpconstants.h"
 #include "llproxy.h"
 
+// *DEBUG:  "[curl:bugs] #1420" problem and testing.
+//
+// A pipelining problem, https://sourceforge.net/p/curl/bugs/1420/,
+// was a source of Core_9 failures.  Code related to this can be
+// identified and tested by:
+// * Looking for '[curl:bugs]' strings in source and following
+//   instructions there.
+// * Set 'QAModeHttpTrace' to 2 or 3 in settings.xml and look for
+//   'timed out' events in the log.
+// * Enable the HttpRangeRequestsDisable debug setting which causes
+//   full asset fetches.  These slow the pipelines down a bit.
+//
+
 namespace
 {
 
@@ -94,6 +107,8 @@ void os_strlower(char * str);
 void check_curl_easy_code(CURLcode code);
 void check_curl_easy_code(CURLcode code, int curl_setopt_option);
 
+static const char * const LOG_CORE("CoreHttp");
+
 } // end anonymous namespace
 
 
@@ -155,6 +170,8 @@ HttpOpRequest::~HttpOpRequest()
 
 	if (mCurlHandle)
 	{
+		// Uncertain of thread context so free using
+		// safest method.
 		curl_easy_cleanup(mCurlHandle);
 		mCurlHandle = NULL;
 	}
@@ -376,6 +393,7 @@ void HttpOpRequest::setupCommon(HttpRequest::policy_t policy_id,
 // Junk may be left around from a failed request and that
 // needs to be cleaned out.
 //
+// *TODO:  Move this to _httplibcurl where it belongs.
 HttpStatus HttpOpRequest::prepareRequest(HttpService * service)
 {
 	CURLcode code;
@@ -409,17 +427,19 @@ HttpStatus HttpOpRequest::prepareRequest(HttpService * service)
 	// *FIXME:  better error handling later
 	HttpStatus status;
 
-	// Get global policy options
-	HttpPolicyGlobal & policy(service->getPolicy().getGlobalOptions());
+	// Get global and class policy options
+	HttpPolicyGlobal & gpolicy(service->getPolicy().getGlobalOptions());
+	HttpPolicyClass & cpolicy(service->getPolicy().getClassOptions(mReqPolicy));
 	
-	mCurlHandle = LLCurl::createStandardCurlHandle();
+	mCurlHandle = service->getTransport().getHandle();
 	if (! mCurlHandle)
 	{
 		// We're in trouble.  We'll continue but it won't go well.
-		LL_WARNS("CoreHttp") << "Failed to allocate libcurl easy handle.  Continuing."
-							 << LL_ENDL;
+		LL_WARNS(LOG_CORE) << "Failed to allocate libcurl easy handle.  Continuing."
+						   << LL_ENDL;
 		return HttpStatus(HttpStatus::LLCORE, HE_BAD_ALLOC);
 	}
+
 	code = curl_easy_setopt(mCurlHandle, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
 	check_curl_easy_code(code, CURLOPT_IPRESOLVE);
 	code = curl_easy_setopt(mCurlHandle, CURLOPT_NOSIGNAL, 1);
@@ -460,30 +480,30 @@ HttpStatus HttpOpRequest::prepareRequest(HttpService * service)
 	code = curl_easy_setopt(mCurlHandle, CURLOPT_SSL_VERIFYHOST, 0);
 	check_curl_easy_code(code, CURLOPT_SSL_VERIFYHOST);
 
-	if (policy.mUseLLProxy)
+	if (gpolicy.mUseLLProxy)
 	{
 		// Use the viewer-based thread-safe API which has a
 		// fast/safe check for proxy enable.  Would like to
 		// encapsulate this someway...
 		LLProxy::getInstance()->applyProxySettings(mCurlHandle);
 	}
-	else if (policy.mHttpProxy.size())
+	else if (gpolicy.mHttpProxy.size())
 	{
 		// *TODO:  This is fine for now but get fuller socks5/
 		// authentication thing going later....
-		code = curl_easy_setopt(mCurlHandle, CURLOPT_PROXY, policy.mHttpProxy.c_str());
+		code = curl_easy_setopt(mCurlHandle, CURLOPT_PROXY, gpolicy.mHttpProxy.c_str());
 		check_curl_easy_code(code, CURLOPT_PROXY);
 		code = curl_easy_setopt(mCurlHandle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);
 		check_curl_easy_code(code, CURLOPT_PROXYTYPE);
 	}
-	if (policy.mCAPath.size())
+	if (gpolicy.mCAPath.size())
 	{
-		code = curl_easy_setopt(mCurlHandle, CURLOPT_CAPATH, policy.mCAPath.c_str());
+		code = curl_easy_setopt(mCurlHandle, CURLOPT_CAPATH, gpolicy.mCAPath.c_str());
 		check_curl_easy_code(code, CURLOPT_CAPATH);
 	}
-	if (policy.mCAFile.size())
+	if (gpolicy.mCAFile.size())
 	{
-		code = curl_easy_setopt(mCurlHandle, CURLOPT_CAINFO, policy.mCAFile.c_str());
+		code = curl_easy_setopt(mCurlHandle, CURLOPT_CAINFO, gpolicy.mCAFile.c_str());
 		check_curl_easy_code(code, CURLOPT_CAINFO);
 	}
 	
@@ -538,9 +558,9 @@ HttpStatus HttpOpRequest::prepareRequest(HttpService * service)
 		break;
 		
 	default:
-		LL_ERRS("CoreHttp") << "Invalid HTTP method in request:  "
-							<< int(mReqMethod)  << ".  Can't recover."
-							<< LL_ENDL;
+		LL_ERRS(LOG_CORE) << "Invalid HTTP method in request:  "
+						  << int(mReqMethod)  << ".  Can't recover."
+						  << LL_ENDL;
 		break;
 	}
 
@@ -592,6 +612,22 @@ HttpStatus HttpOpRequest::prepareRequest(HttpService * service)
 	{
 		xfer_timeout = timeout;
 	}
+	if (cpolicy.mPipelining > 1L)
+	{
+		// Pipelining affects both connection and transfer timeout values.
+		// Requests that are added to a pipeling immediately have completed
+		// their connection so the connection delay tends to be less than
+		// the non-pipelined value.  Transfers are the opposite.  Transfer
+		// timeout starts once the connection is established and completion
+		// can be delayed due to the pipelined requests ahead.  So, it's
+		// a handwave but bump the transfer timeout up by the pipelining
+		// depth to give some room.
+		//
+		// *TODO:  Find a better scheme than timeouts to guarantee liveness.
+		xfer_timeout *= cpolicy.mPipelining;
+	}
+	// *DEBUG:  Enable following override for timeout handling and "[curl:bugs] #1420" tests
+	// xfer_timeout = 1L;
 	code = curl_easy_setopt(mCurlHandle, CURLOPT_TIMEOUT, xfer_timeout);
 	check_curl_easy_code(code, CURLOPT_TIMEOUT);
 	code = curl_easy_setopt(mCurlHandle, CURLOPT_CONNECTTIMEOUT, timeout);
@@ -652,8 +688,8 @@ size_t HttpOpRequest::readCallback(void * data, size_t size, size_t nmemb, void
 		{
 			// Warn but continue if the read position moves beyond end-of-body
 			// for some reason.
-			LL_WARNS("CoreHttp") << "Request body position beyond body size.  Truncating request body."
-								 << LL_ENDL;
+			LL_WARNS(LOG_CORE) << "Request body position beyond body size.  Truncating request body."
+							   << LL_ENDL;
 		}
 		return 0;
 	}
@@ -790,10 +826,10 @@ size_t HttpOpRequest::headerCallback(void * data, size_t size, size_t nmemb, voi
 		else
 		{
 			// Ignore the unparsable.
-			LL_INFOS_ONCE("CoreHttp") << "Problem parsing odd Content-Range header:  '"
-									  << std::string(hdr_data, wanted_hdr_size)
-									  << "'.  Ignoring."
-									  << LL_ENDL;
+			LL_INFOS_ONCE(LOG_CORE) << "Problem parsing odd Content-Range header:  '"
+									<< std::string(hdr_data, wanted_hdr_size)
+									<< "'.  Ignoring."
+									<< LL_ENDL;
 		}
 	}
 
@@ -895,11 +931,11 @@ int HttpOpRequest::debugCallback(CURL * handle, curl_infotype info, char * buffe
 
 	if (logit)
 	{
-		LL_INFOS("CoreHttp") << "TRACE, LibcurlDebug, Handle:  "
-							 << static_cast<HttpHandle>(op)
-							 << ", Type:  " << tag
-							 << ", Data:  " << safe_line
-							 << LL_ENDL;
+		LL_INFOS(LOG_CORE) << "TRACE, LibcurlDebug, Handle:  "
+						   << static_cast<HttpHandle>(op)
+						   << ", Type:  " << tag
+						   << ", Data:  " << safe_line
+						   << LL_ENDL;
 	}
 		
 	return 0;
@@ -1094,9 +1130,9 @@ void check_curl_easy_code(CURLcode code, int curl_setopt_option)
 		//
 		// linux appears to throw a curl error once per session for a bad initialization
 		// at a pretty random time (when enabling cookies).
-		LL_WARNS("CoreHttp") << "libcurl error detected:  " << curl_easy_strerror(code)
-							 << ", curl_easy_setopt option:  " << curl_setopt_option
-							 << LL_ENDL;
+		LL_WARNS(LOG_CORE) << "libcurl error detected:  " << curl_easy_strerror(code)
+						   << ", curl_easy_setopt option:  " << curl_setopt_option
+						   << LL_ENDL;
 	}
 }
 
@@ -1109,8 +1145,8 @@ void check_curl_easy_code(CURLcode code)
 		//
 		// linux appears to throw a curl error once per session for a bad initialization
 		// at a pretty random time (when enabling cookies).
-		LL_WARNS("CoreHttp") << "libcurl error detected:  " << curl_easy_strerror(code)
-							 << LL_ENDL;
+		LL_WARNS(LOG_CORE) << "libcurl error detected:  " << curl_easy_strerror(code)
+						   << LL_ENDL;
 	}
 }
 
diff --git a/indra/llcorehttp/_httppolicy.cpp b/indra/llcorehttp/_httppolicy.cpp
index fd5a93e192..e5d6321401 100755
--- a/indra/llcorehttp/_httppolicy.cpp
+++ b/indra/llcorehttp/_httppolicy.cpp
@@ -4,7 +4,7 @@
  *
  * $LicenseInfo:firstyear=2012&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2012-2013, Linden Research, Inc.
+ * Copyright (C) 2012-2014, 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
@@ -35,6 +35,13 @@
 
 #include "lltimer.h"
 
+namespace
+{
+
+static const char * const LOG_CORE("CoreHttp");
+
+} // end anonymous namespace
+
 
 namespace LLCore
 {
@@ -51,7 +58,8 @@ public:
 	ClassState()
 		: mThrottleEnd(0),
 		  mThrottleLeft(0L),
-		  mRequestCount(0L)
+		  mRequestCount(0L),
+		  mStallStaging(false)
 		{}
 	
 	HttpReadyQueue		mReadyQueue;
@@ -61,6 +69,7 @@ public:
 	HttpTime			mThrottleEnd;
 	long				mThrottleLeft;
 	long				mRequestCount;
+	bool				mStallStaging;
 };
 
 
@@ -128,7 +137,8 @@ void HttpPolicy::shutdown()
 
 
 void HttpPolicy::start()
-{}
+{
+}
 
 
 void HttpPolicy::addOp(HttpOpRequest * op)
@@ -170,19 +180,19 @@ void HttpPolicy::retryOp(HttpOpRequest * op)
 	{
 		++op->mPolicy503Retries;
 	}
-	LL_DEBUGS("CoreHttp") << "HTTP request " << static_cast<HttpHandle>(op)
-						  << " retry " << op->mPolicyRetries
-						  << " scheduled in " << (delta / HttpTime(1000))
-						  << " mS (" << (external_delta ? "external" : "internal")
-						  << ").  Status:  " << op->mStatus.toTerseString()
-						  << LL_ENDL;
+	LL_DEBUGS(LOG_CORE) << "HTTP request " << static_cast<HttpHandle>(op)
+						<< " retry " << op->mPolicyRetries
+						<< " scheduled in " << (delta / HttpTime(1000))
+						<< " mS (" << (external_delta ? "external" : "internal")
+						<< ").  Status:  " << op->mStatus.toTerseString()
+						<< LL_ENDL;
 	if (op->mTracing > HTTP_TRACE_OFF)
 	{
-		LL_INFOS("CoreHttp") << "TRACE, ToRetryQueue, Handle:  "
-							 << static_cast<HttpHandle>(op)
-							 << ", Delta:  " << (delta / HttpTime(1000))
-							 << ", Retries:  " << op->mPolicyRetries
-							 << LL_ENDL;
+		LL_INFOS(LOG_CORE) << "TRACE, ToRetryQueue, Handle:  "
+						   << static_cast<HttpHandle>(op)
+						   << ", Delta:  " << (delta / HttpTime(1000))
+						   << ", Retries:  " << op->mPolicyRetries
+						   << LL_ENDL;
 	}
 	mClasses[policy_class]->mRetryQueue.push(op);
 }
@@ -218,6 +228,15 @@ HttpService::ELoopSpeed HttpPolicy::processReadyQueue()
 		HttpRetryQueue & retryq(state.mRetryQueue);
 		HttpReadyQueue & readyq(state.mReadyQueue);
 
+		if (state.mStallStaging)
+		{
+			// Stalling but don't sleep.  Need to complete operations
+			// and get back to servicing queues.  Do this test before
+			// the retryq/readyq test or you'll get stalls until you
+			// click a setting or an asset request comes in.
+			result = HttpService::NORMAL;
+			continue;
+		}
 		if (retryq.empty() && readyq.empty())
 		{
 			continue;
@@ -234,7 +253,11 @@ HttpService::ELoopSpeed HttpPolicy::processReadyQueue()
 		}
 
 		int active(transport.getActiveCountInClass(policy_class));
-		int needed(state.mOptions.mConnectionLimit - active);		// Expect negatives here
+		int active_limit(state.mOptions.mPipelining > 1L
+						 ? (state.mOptions.mPerHostConnectionLimit
+							* state.mOptions.mPipelining)
+						 : state.mOptions.mConnectionLimit);
+		int needed(active_limit - active);		// Expect negatives here
 
 		if (needed > 0)
 		{
@@ -257,9 +280,9 @@ HttpService::ELoopSpeed HttpPolicy::processReadyQueue()
 					if (now >= state.mThrottleEnd)
 					{
 						// Throttle expired, move to next window
-						LL_DEBUGS("CoreHttp") << "Throttle expired with " << state.mThrottleLeft
-											  << " requests to go and " << state.mRequestCount
-											  << " requests issued." << LL_ENDL;
+						LL_DEBUGS(LOG_CORE) << "Throttle expired with " << state.mThrottleLeft
+											<< " requests to go and " << state.mRequestCount
+											<< " requests issued." << LL_ENDL;
 						state.mThrottleLeft = state.mOptions.mThrottleRate;
 						state.mThrottleEnd = now + HttpTime(1000000);
 					}
@@ -286,9 +309,9 @@ HttpService::ELoopSpeed HttpPolicy::processReadyQueue()
 					if (now >= state.mThrottleEnd)
 					{
 						// Throttle expired, move to next window
-						LL_DEBUGS("CoreHttp") << "Throttle expired with " << state.mThrottleLeft
-											  << " requests to go and " << state.mRequestCount
-											  << " requests issued." << LL_ENDL;
+						LL_DEBUGS(LOG_CORE) << "Throttle expired with " << state.mThrottleLeft
+											<< " requests to go and " << state.mRequestCount
+											<< " requests issued." << LL_ENDL;
 						state.mThrottleLeft = state.mOptions.mThrottleRate;
 						state.mThrottleEnd = now + HttpTime(1000000);
 					}
@@ -391,6 +414,18 @@ bool HttpPolicy::stageAfterCompletion(HttpOpRequest * op)
 	// Retry or finalize
 	if (! op->mStatus)
 	{
+		// *DEBUG:  For "[curl:bugs] #1420" tests.  This will interfere
+		// with unit tests due to allocation retention by logging code.
+		// But you won't be checking this in enabled.
+#if 0
+		if (op->mStatus == HttpStatus(HttpStatus::EXT_CURL_EASY, CURLE_OPERATION_TIMEDOUT))
+		{
+			LL_WARNS(LOG_CORE) << "HTTP request " << static_cast<HttpHandle>(op)
+							   << " timed out."
+							   << LL_ENDL;
+		}
+#endif
+		
 		// If this failed, we might want to retry.
 		if (op->mPolicyRetries < op->mPolicyRetryLimit && op->mStatus.isRetryable())
 		{
@@ -403,17 +438,17 @@ bool HttpPolicy::stageAfterCompletion(HttpOpRequest * op)
 	// This op is done, finalize it delivering it to the reply queue...
 	if (! op->mStatus)
 	{
-		LL_WARNS("CoreHttp") << "HTTP request " << static_cast<HttpHandle>(op)
-							 << " failed after " << op->mPolicyRetries
-							 << " retries.  Reason:  " << op->mStatus.toString()
-							 << " (" << op->mStatus.toTerseString() << ")"
-							 << LL_ENDL;
+		LL_WARNS(LOG_CORE) << "HTTP request " << static_cast<HttpHandle>(op)
+						   << " failed after " << op->mPolicyRetries
+						   << " retries.  Reason:  " << op->mStatus.toString()
+						   << " (" << op->mStatus.toTerseString() << ")"
+						   << LL_ENDL;
 	}
 	else if (op->mPolicyRetries)
 	{
-		LL_DEBUGS("CoreHttp") << "HTTP request " << static_cast<HttpHandle>(op)
-							  << " succeeded on retry " << op->mPolicyRetries << "."
-							  << LL_ENDL;
+		LL_DEBUGS(LOG_CORE) << "HTTP request " << static_cast<HttpHandle>(op)
+							<< " succeeded on retry " << op->mPolicyRetries << "."
+							<< LL_ENDL;
 	}
 
 	op->stageFromActive(mService);
@@ -441,4 +476,17 @@ int HttpPolicy::getReadyCount(HttpRequest::policy_t policy_class) const
 }
 
 
+bool HttpPolicy::stallPolicy(HttpRequest::policy_t policy_class, bool stall)
+{
+	bool ret(false);
+	
+	if (policy_class < mClasses.size())
+	{
+		ret = mClasses[policy_class]->mStallStaging;
+		mClasses[policy_class]->mStallStaging = stall;
+	}
+	return ret;
+}
+
+
 }  // end namespace LLCore
diff --git a/indra/llcorehttp/_httppolicy.h b/indra/llcorehttp/_httppolicy.h
index bf1aa74267..11cd89bbd1 100755
--- a/indra/llcorehttp/_httppolicy.h
+++ b/indra/llcorehttp/_httppolicy.h
@@ -158,6 +158,14 @@ public:
 	/// Threading:  called by worker thread
 	int getReadyCount(HttpRequest::policy_t policy_class) const;
 	
+	/// Stall (or unstall) a policy class preventing requests from
+	/// transitioning to an active state.  Used to allow an HTTP
+	/// request policy to empty prior to changing settings or state
+	/// that isn't tolerant of changes when work is outstanding.
+	///
+	/// Threading:  called by worker thread
+	bool stallPolicy(HttpRequest::policy_t policy_class, bool stall);
+	
 protected:
 	struct ClassState;
 	typedef std::vector<ClassState *>	class_list_t;
diff --git a/indra/llcorehttp/_httppolicyclass.cpp b/indra/llcorehttp/_httppolicyclass.cpp
index f34a8e9f1e..2c0f650155 100755
--- a/indra/llcorehttp/_httppolicyclass.cpp
+++ b/indra/llcorehttp/_httppolicyclass.cpp
@@ -4,7 +4,7 @@
  *
  * $LicenseInfo:firstyear=2012&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2012-2013, Linden Research, Inc.
+ * Copyright (C) 2012-2014, 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
@@ -78,8 +78,8 @@ HttpStatus HttpPolicyClass::set(HttpRequest::EPolicyOption opt, long value)
 		mPerHostConnectionLimit = llclamp(value, long(HTTP_CONNECTION_LIMIT_MIN), mConnectionLimit);
 		break;
 
-	case HttpRequest::PO_ENABLE_PIPELINING:
-		mPipelining = llclamp(value, 0L, 1L);
+	case HttpRequest::PO_PIPELINING_DEPTH:
+		mPipelining = llclamp(value, 0L, HTTP_PIPELINING_MAX);
 		break;
 
 	case HttpRequest::PO_THROTTLE_RATE:
@@ -106,7 +106,7 @@ HttpStatus HttpPolicyClass::get(HttpRequest::EPolicyOption opt, long * value) co
 		*value = mPerHostConnectionLimit;
 		break;
 
-	case HttpRequest::PO_ENABLE_PIPELINING:
+	case HttpRequest::PO_PIPELINING_DEPTH:
 		*value = mPipelining;
 		break;
 
diff --git a/indra/llcorehttp/_httpservice.cpp b/indra/llcorehttp/_httpservice.cpp
index c94249dc2d..c673e1be1d 100755
--- a/indra/llcorehttp/_httpservice.cpp
+++ b/indra/llcorehttp/_httpservice.cpp
@@ -4,7 +4,7 @@
  *
  * $LicenseInfo:firstyear=2012&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2012-2013, Linden Research, Inc.
+ * Copyright (C) 2012-2014, 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
@@ -40,6 +40,14 @@
 #include "llthread.h"
 
 
+namespace
+{
+
+static const char * const LOG_CORE("CoreHttp");
+
+} // end anonymous namespace
+
+
 namespace LLCore
 {
 
@@ -87,8 +95,8 @@ HttpService::~HttpService()
 				// Failed to join, expect problems ahead so do a hard termination.
 				mThread->cancel();
 
-				LL_WARNS("CoreHttp") << "Destroying HttpService with running thread.  Expect problems."
-									 << LL_ENDL;
+				LL_WARNS(LOG_CORE) << "Destroying HttpService with running thread.  Expect problems."
+								   << LL_ENDL;
 			}
 		}
 	}
@@ -328,9 +336,9 @@ HttpService::ELoopSpeed HttpService::processRequestQueue(ELoopSpeed loop)
 
 			if (op->mTracing > HTTP_TRACE_OFF)
 			{
-				LL_INFOS("CoreHttp") << "TRACE, FromRequestQueue, Handle:  "
-									 << static_cast<HttpHandle>(op)
-									 << LL_ENDL;
+				LL_INFOS(LOG_CORE) << "TRACE, FromRequestQueue, Handle:  "
+								   << static_cast<HttpHandle>(op)
+								   << LL_ENDL;
 			}
 
 			// Stage
@@ -437,9 +445,13 @@ HttpStatus HttpService::setPolicyOption(HttpRequest::EPolicyOption opt, HttpRequ
 		HttpPolicyClass & opts(mPolicy->getClassOptions(pclass));
 
 		status = opts.set(opt, value);
-		if (status && ret_value)
+		if (status)
 		{
-			status = opts.get(opt, ret_value);
+			mTransport->policyUpdated(pclass);
+			if (ret_value)
+			{
+				status = opts.get(opt, ret_value);
+			}
 		}
 	}
 
@@ -463,7 +475,7 @@ HttpStatus HttpService::setPolicyOption(HttpRequest::EPolicyOption opt, HttpRequ
 		return status;
 	}
 
-	// Only string values are global at this time
+	// String values are always global (at this time).
 	if (pclass == HttpRequest::GLOBAL_POLICY_ID)
 	{
 		HttpPolicyGlobal & opts(mPolicy->getGlobalOptions());
diff --git a/indra/llcorehttp/examples/http_texture_load.cpp b/indra/llcorehttp/examples/http_texture_load.cpp
index 73c49687d7..b76c874557 100755
--- a/indra/llcorehttp/examples/http_texture_load.cpp
+++ b/indra/llcorehttp/examples/http_texture_load.cpp
@@ -4,7 +4,7 @@
  *
  * $LicenseInfo:firstyear=2012&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2012-2013, Linden Research, Inc.
+ * Copyright (C) 2012-2014, 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
@@ -59,11 +59,13 @@ void usage(std::ostream & out);
 // Default command line settings
 static int concurrency_limit(40);
 static int highwater(100);
+static int pipeline_depth(0);
+static int tracing(0);
 static char url_format[1024] = "http://example.com/some/path?texture_id=%s.texture";
 
 #if defined(WIN32)
 
-#define	strncpy(_a, _b, _c)   strncpy_s(_a, _b, _c)
+#define	strncpy(_a, _b, _c)			strncpy_s(_a, _b, _c)
 #define strtok_r(_a, _b, _c)		strtok_s(_a, _b, _c)
 
 int getopt(int argc, char * const argv[], const char *optstring);
@@ -100,6 +102,7 @@ public:
 public:
 	bool						mVerbose;
 	bool						mRandomRange;
+	bool						mNoRange;
 	int							mRequestLowWater;
 	int							mRequestHighWater;
 	handle_set_t				mHandles;
@@ -160,10 +163,11 @@ int main(int argc, char** argv)
 {
 	LLCore::HttpStatus status;
 	bool do_random(false);
+	bool do_whole(false);
 	bool do_verbose(false);
 	
 	int option(-1);
-	while (-1 != (option = getopt(argc, argv, "u:c:h?RvH:")))
+	while (-1 != (option = getopt(argc, argv, "u:c:h?RwvH:p:t:")))
 	{
 		switch (option)
 		{
@@ -193,7 +197,7 @@ int main(int argc, char** argv)
 				char * end;
 
 				value = strtoul(optarg, &end, 10);
-				if (value < 1 || value > 100 || *end != '\0')
+				if (value < 1 || value > 200 || *end != '\0')
 				{
 					usage(std::cerr);
 					return 1;
@@ -202,8 +206,44 @@ int main(int argc, char** argv)
 			}
 			break;
 
+		case 'p':
+		    {
+				unsigned long value;
+				char * end;
+
+				value = strtoul(optarg, &end, 10);
+				if (value < 0 || value > 100 || *end != '\0')
+				{
+					usage(std::cerr);
+					return 1;
+				}
+				pipeline_depth = value;
+			}
+			break;
+
+		case '5':
+		    {
+				unsigned long value;
+				char * end;
+
+				value = strtoul(optarg, &end, 10);
+				if (value < 0 || value > 3 || *end != '\0')
+				{
+					usage(std::cerr);
+					return 1;
+				}
+				tracing = value;
+			}
+			break;
+
 		case 'R':
 			do_random = true;
+			do_whole = false;
+			break;
+
+		case 'w':
+			do_whole = true;
+			do_random = false;
 			break;
 
 		case 'v':
@@ -240,6 +280,24 @@ int main(int argc, char** argv)
 											   LLCore::HttpRequest::DEFAULT_POLICY_ID,
 											   concurrency_limit,
 											   NULL);
+	LLCore::HttpRequest::setStaticPolicyOption(LLCore::HttpRequest::PO_PER_HOST_CONNECTION_LIMIT,
+											   LLCore::HttpRequest::DEFAULT_POLICY_ID,
+											   concurrency_limit,
+											   NULL);
+	if (pipeline_depth)
+	{
+		LLCore::HttpRequest::setStaticPolicyOption(LLCore::HttpRequest::PO_PIPELINING_DEPTH,
+												   LLCore::HttpRequest::DEFAULT_POLICY_ID,
+												   pipeline_depth,
+												   NULL);
+	}
+	if (tracing)
+	{
+		LLCore::HttpRequest::setStaticPolicyOption(LLCore::HttpRequest::PO_TRACE,
+												   LLCore::HttpRequest::DEFAULT_POLICY_ID,
+												   tracing,
+												   NULL);
+	}
 	LLCore::HttpRequest::startThread();
 	
 	// Get service point
@@ -257,6 +315,7 @@ int main(int argc, char** argv)
 	ws.mUrl = url_format;
 	ws.loadAssetUuids(uuids);
 	ws.mRandomRange = do_random;
+	ws.mNoRange = do_whole;
 	ws.mVerbose = do_verbose;
 	ws.mRequestHighWater = highwater;
 	ws.mRequestLowWater = ws.mRequestHighWater / 2;
@@ -331,10 +390,15 @@ void usage(std::ostream & out)
 		" -u <url_format>       printf-style format string for URL generation\n"
 		"                       Default:  " << url_format << "\n"
 		" -R                    Issue GETs with random Range: headers\n"
+		" -w                    Issue GETs without Range: headers to get whole object\n"
 		" -c <limit>            Maximum connection concurrency.  Range:  [1..100]\n"
 		"                       Default:  " << concurrency_limit << "\n"
 		" -H <limit>            HTTP request highwater (requests fed to llcorehttp).\n"
-		"                       Range:  [1..100]  Default:  " << highwater << "\n"
+		"                       Range:  [1..200]  Default:  " << highwater << "\n"
+		" -p <depth>            If <depth> is positive, enables and sets pipelineing\n"
+		"                       depth on HTTP requests.  Default:  " << pipeline_depth << "\n"
+		" -t <level>            If <level> is positive ([1..3]), enables and sets HTTP\n"
+		"                       tracing on HTTP requests.  Default:  " << tracing << "\n"
 		" -v                    Verbose mode.  Issue some chatter while running\n"
 		" -h                    print this help\n"
 		"\n"
@@ -346,6 +410,7 @@ WorkingSet::WorkingSet()
 	: LLCore::HttpHandler(),
 	  mVerbose(false),
 	  mRandomRange(false),
+	  mNoRange(false),
 	  mRemaining(200),
 	  mLimit(200),
 	  mAt(0),
@@ -395,8 +460,12 @@ bool WorkingSet::reload(LLCore::HttpRequest * hr, LLCore::HttpOptions * opt)
 #else
 		snprintf(buffer, sizeof(buffer), mUrl.c_str(), mAssets[mAt].mUuid.c_str());
 #endif
-		int offset(mRandomRange ? ((unsigned long) rand()) % 1000000UL : mAssets[mAt].mOffset);
-		int length(mRandomRange ? ((unsigned long) rand()) % 1000000UL : mAssets[mAt].mLength);
+		int offset(mNoRange
+				   ? 0
+				   : (mRandomRange ? ((unsigned long) rand()) % 1000000UL : mAssets[mAt].mOffset));
+		int length(mNoRange
+				   ? 0
+				   : (mRandomRange ? ((unsigned long) rand()) % 1000000UL : mAssets[mAt].mLength));
 
 		LLCore::HttpHandle handle;
 		if (offset || length)
diff --git a/indra/llcorehttp/httpcommon.cpp b/indra/llcorehttp/httpcommon.cpp
index c2f15155ac..7907e958a4 100755
--- a/indra/llcorehttp/httpcommon.cpp
+++ b/indra/llcorehttp/httpcommon.cpp
@@ -4,7 +4,7 @@
  *
  * $LicenseInfo:firstyear=2012&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2012-2013, Linden Research, Inc.
+ * Copyright (C) 2012-2014, 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
@@ -219,6 +219,13 @@ std::string HttpStatus::toTerseString() const
 // Pass true on statuses that might actually be cleared by a
 // retry.  Library failures, calling problems, etc. aren't
 // going to be fixed by squirting bits all over the Net.
+//
+// HE_INVALID_HTTP_STATUS is special.  As of 7.37.0, there are
+// some scenarios where response processing in libcurl appear
+// to go wrong and response data is corrupted.  A side-effect
+// of this is that the HTTP status is read as 0 from the library.
+// See libcurl bug report 1420 (https://sourceforge.net/p/curl/bugs/1420/)
+// for details.
 bool HttpStatus::isRetryable() const
 {
 	static const HttpStatus cant_connect(HttpStatus::EXT_CURL_EASY, CURLE_COULDNT_CONNECT);
@@ -231,6 +238,11 @@ bool HttpStatus::isRetryable() const
 	static const HttpStatus post_error(HttpStatus::EXT_CURL_EASY, CURLE_HTTP_POST_ERROR);
 	static const HttpStatus partial_file(HttpStatus::EXT_CURL_EASY, CURLE_PARTIAL_FILE);
 	static const HttpStatus inv_cont_range(HttpStatus::LLCORE, HE_INV_CONTENT_RANGE_HDR);
+	static const HttpStatus inv_status(HttpStatus::LLCORE, HE_INVALID_HTTP_STATUS);
+
+	// *DEBUG:  For "[curl:bugs] #1420" tests.
+	// Disable the '*this == inv_status' test and look for 'Core_9'
+	// failures in log files.
 
 	return ((isHttpStatus() && mType >= 499 && mType <= 599) ||	// Include special 499 in retryables
 			*this == cant_connect ||	// Connection reset/endpoint problems
@@ -242,6 +254,8 @@ bool HttpStatus::isRetryable() const
 			*this == op_timedout ||		// Timer expired
 			*this == post_error ||		// Transport problem
 			*this == partial_file ||	// Data inconsistency in response
+			// *DEBUG:  Comment out 'inv_status' test for [curl:bugs] #1420 testing.
+			*this == inv_status ||		// Inv status can reflect internal state problem in libcurl
 			*this == inv_cont_range);	// Short data read disagrees with content-range
 }
 
diff --git a/indra/llcorehttp/httprequest.h b/indra/llcorehttp/httprequest.h
index 651654844a..7f23723b0b 100755
--- a/indra/llcorehttp/httprequest.h
+++ b/indra/llcorehttp/httprequest.h
@@ -4,7 +4,7 @@
  *
  * $LicenseInfo:firstyear=2012&license=viewerlgpl$
  * Second Life Viewer Source Code
- * Copyright (C) 2012-2013, Linden Research, Inc.
+ * Copyright (C) 2012-2014, 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
@@ -183,11 +183,38 @@ public:
 		/// Global only
 		PO_TRACE,
 
-		/// Suitable requests are allowed to pipeline on their
-		/// connections when they ask for it.
+		/// If greater than 1, suitable requests are allowed to
+		/// pipeline on their connections when they ask for it.
+		/// Value gives the maximum number of outstanding requests
+		/// on a connection.
+		///
+		/// There is some interaction between PO_CONNECTION_LIMIT,
+		/// PO_PER_HOST_CONNECTION_LIMIT, and PO_PIPELINING_DEPTH.
+		/// When PIPELINING_DEPTH is 0 or 1 (no pipelining), this
+		/// library manages connection lifecycle and honors the
+		/// PO_CONNECTION_LIMIT setting as the maximum in-flight
+		/// request limit.  Libcurl itself may be caching additional
+		/// connections under its connection cache policy.
+		///
+		/// When PIPELINING_DEPTH is 2 or more, libcurl performs
+		/// connection management and both PO_CONNECTION_LIMIT and
+		/// PO_PER_HOST_CONNECTION_LIMIT should be set and non-zero.
+		/// In this case (as of libcurl 7.37.0), libcurl will
+		/// open new connections in preference to pipelining, up
+		/// to the above limits at which time pipelining begins.
+		/// And as usual, an additional cache of open but inactive
+		/// connections may still be maintained within libcurl.
+		/// For SL, a good rule-of-thumb is to set
+		/// PO_PER_HOST_CONNECTION_LIMIT to the user-visible
+		/// concurrency value and PO_CONNECTION_LIMIT to twice
+		/// that for baked texture loads and region crossings where
+		/// additional connection load will be tolerated.  If
+		/// either limit is 0, libcurl will prefer pipelining
+		/// over connection creation, which is still interesting,
+		/// but won't be pursued at this time.
 		///
 		/// Per-class only
-		PO_ENABLE_PIPELINING,
+		PO_PIPELINING_DEPTH,
 
 		/// Controls whether client-side throttling should be
 		/// performed on this policy class.  Positive values