6 files changed, 50 insertions, 12 deletions
diff --git a/indra/llcorehttp/_httpinternal.h b/indra/llcorehttp/_httpinternal.h
index 79c89d6c92..690ebbecd8 100644
--- a/indra/llcorehttp/_httpinternal.h
+++ b/indra/llcorehttp/_httpinternal.h
@@ -127,9 +127,12 @@ const int HTTP_TRACE_MAX = HTTP_TRACE_CURL_BODIES;
 // We want to span a few windows to allow transport to slow
 // after onset of the throttles and then recover without a final
 // failure.  Other systems may need other constants.
-const int HTTP_RETRY_COUNT_DEFAULT = 8;
+const int HTTP_RETRY_COUNT_DEFAULT = 5;
 const int HTTP_RETRY_COUNT_MIN = 0;
 const int HTTP_RETRY_COUNT_MAX = 100;
+const HttpTime HTTP_RETRY_BACKOFF_MIN_DEFAULT = 1E6L; // 1 sec
+const HttpTime HTTP_RETRY_BACKOFF_MAX_DEFAULT = 5E6L; // 5 sec
+const HttpTime HTTP_RETRY_BACKOFF_MAX = 20E6L; // 20 sec
 
 const int HTTP_REDIRECTS_DEFAULT = 10;
 
diff --git a/indra/llcorehttp/_httpoprequest.cpp b/indra/llcorehttp/_httpoprequest.cpp
index f526af37b5..721147ffb0 100644
--- a/indra/llcorehttp/_httpoprequest.cpp
+++ b/indra/llcorehttp/_httpoprequest.cpp
@@ -142,6 +142,8 @@ HttpOpRequest::HttpOpRequest()
 	  mPolicy503Retries(0),
 	  mPolicyRetryAt(HttpTime(0)),
 	  mPolicyRetryLimit(HTTP_RETRY_COUNT_DEFAULT),
+	  mPolicyMinRetryBackoff(HttpTime(HTTP_RETRY_BACKOFF_MIN_DEFAULT)),
+	  mPolicyMaxRetryBackoff(HttpTime(HTTP_RETRY_BACKOFF_MAX_DEFAULT)),
 	  mCallbackSSLVerify(NULL)
 {
 	// *NOTE:  As members are added, retry initialization/cleanup
@@ -438,6 +440,9 @@ void HttpOpRequest::setupCommon(HttpRequest::policy_t policy_id,
 		mPolicyRetryLimit = options->getRetries();
 		mPolicyRetryLimit = llclamp(mPolicyRetryLimit, HTTP_RETRY_COUNT_MIN, HTTP_RETRY_COUNT_MAX);
 		mTracing = (std::max)(mTracing, llclamp(options->getTrace(), HTTP_TRACE_MIN, HTTP_TRACE_MAX));
+
+		mPolicyMinRetryBackoff = llclamp(options->getMinBackoff(), HttpTime(0), HTTP_RETRY_BACKOFF_MAX);
+		mPolicyMaxRetryBackoff = llclamp(options->getMaxBackoff(), mPolicyMinRetryBackoff, HTTP_RETRY_BACKOFF_MAX);
 	}
 }
 
diff --git a/indra/llcorehttp/_httpoprequest.h b/indra/llcorehttp/_httpoprequest.h
index 201c37d5c3..cdbe350785 100644
--- a/indra/llcorehttp/_httpoprequest.h
+++ b/indra/llcorehttp/_httpoprequest.h
@@ -233,6 +233,8 @@ public:
 	int					mPolicy503Retries;
 	HttpTime			mPolicyRetryAt;
 	int					mPolicyRetryLimit;
+	HttpTime			mPolicyMinRetryBackoff; // initial delay between retries (mcs)
+	HttpTime			mPolicyMaxRetryBackoff;
 };  // end class HttpOpRequest
 
 
diff --git a/indra/llcorehttp/_httppolicy.cpp b/indra/llcorehttp/_httppolicy.cpp
index a302db8b46..885f0ed61d 100644
--- a/indra/llcorehttp/_httppolicy.cpp
+++ b/indra/llcorehttp/_httppolicy.cpp
@@ -152,20 +152,16 @@ void HttpPolicy::addOp(const HttpOpRequest::ptr_t &op)
 
 void HttpPolicy::retryOp(const HttpOpRequest::ptr_t &op)
 {
-	static const HttpTime retry_deltas[] =
-		{
-			 250000,			// 1st retry in 0.25 S, etc...
-			 500000,
-			1000000,
-			2000000,
-			5000000				// ... to every 5.0 S.
-		};
-	static const int delta_max(int(LL_ARRAY_SIZE(retry_deltas)) - 1);
 	static const HttpStatus error_503(503);
 
 	const HttpTime now(totalTime());
 	const int policy_class(op->mReqPolicy);
-	HttpTime delta(retry_deltas[llclamp(op->mPolicyRetries, 0, delta_max)]);
+
+	HttpTime delta_min = op->mPolicyMinRetryBackoff;
+	HttpTime delta_max = op->mPolicyMaxRetryBackoff;
+	// mPolicyRetries limited to 100
+	U32 delta_factor = op->mPolicyRetries <= 10 ? 1 << op->mPolicyRetries : 1024;
+	HttpTime delta = llmin(delta_min * delta_factor, delta_max);
 	bool external_delta(false);
 
 	if (op->mReplyRetryAfter > 0 && op->mReplyRetryAfter < 30)
diff --git a/indra/llcorehttp/httpoptions.cpp b/indra/llcorehttp/httpoptions.cpp
index aab447f2dd..df5aa52fa9 100644
--- a/indra/llcorehttp/httpoptions.cpp
+++ b/indra/llcorehttp/httpoptions.cpp
@@ -39,6 +39,8 @@ HttpOptions::HttpOptions() :
     mTimeout(HTTP_REQUEST_TIMEOUT_DEFAULT),
     mTransferTimeout(HTTP_REQUEST_XFER_TIMEOUT_DEFAULT),
     mRetries(HTTP_RETRY_COUNT_DEFAULT),
+    mMinRetryBackoff(HTTP_RETRY_BACKOFF_MIN_DEFAULT),
+    mMaxRetryBackoff(HTTP_RETRY_BACKOFF_MAX_DEFAULT),
     mUseRetryAfter(HTTP_USE_RETRY_AFTER_DEFAULT),
     mFollowRedirects(true),
     mVerifyPeer(false),
@@ -81,6 +83,16 @@ void HttpOptions::setRetries(unsigned int retries)
 	mRetries = retries;
 }
 
+void HttpOptions::setMinBackoff(HttpTime delay)
+{
+	mMinRetryBackoff = delay;
+}
+
+void HttpOptions::setMaxBackoff(HttpTime delay)
+{
+	mMaxRetryBackoff = delay;
+}
+
 void HttpOptions::setUseRetryAfter(bool use_retry)
 {
 	mUseRetryAfter = use_retry;
diff --git a/indra/llcorehttp/httpoptions.h b/indra/llcorehttp/httpoptions.h
index 510eaa45bb..8a6de61b04 100644
--- a/indra/llcorehttp/httpoptions.h
+++ b/indra/llcorehttp/httpoptions.h
@@ -101,13 +101,31 @@ public:
 
     /// Sets the number of retries on an LLCore::HTTPRequest before the 
     /// request fails.
-	// Default:  8
+	// Default:  5
 	void				setRetries(unsigned int retries);
 	unsigned int		getRetries() const
 	{
 		return mRetries;
 	}
 
+	/// Sets minimal delay before request retries. In microseconds.
+	/// HttpPolicy will increase delay from min to max with each retry
+	// Default: 1 000 000 mcs
+	void				setMinBackoff(HttpTime delay);
+	HttpTime			getMinBackoff() const
+	{
+		return mMinRetryBackoff;
+	}
+
+	/// Sets maximum delay before request retries. In microseconds.
+	/// HttpPolicy will increase delay from min to max with each retry
+	// Default:  5 000 000 mcs
+	void				setMaxBackoff(HttpTime delay);
+	HttpTime			getMaxBackoff() const
+	{
+		return mMaxRetryBackoff;
+	}
+
 	// Default:  true
 	void				setUseRetryAfter(bool use_retry);
 	bool				getUseRetryAfter() const
@@ -166,6 +184,8 @@ protected:
 	unsigned int		mTimeout;
 	unsigned int		mTransferTimeout;
 	unsigned int		mRetries;
+	HttpTime			mMinRetryBackoff;
+	HttpTime			mMaxRetryBackoff;
 	bool				mUseRetryAfter;
 	bool				mFollowRedirects;
 	bool				mVerifyPeer;