From b5d99672f084f3e8c1ef72cdb38eb50679494ff5 Mon Sep 17 00:00:00 2001
From: Nic Jansma <nic@nicj.net>
Date: Fri, 12 May 2017 18:40:34 -0400
Subject: [PATCH] sendBeacon: x-www-form-urlencoded

---
 boomerang.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/boomerang.js b/boomerang.js
index a2bc25483..83df42b80 100644
--- a/boomerang.js
+++ b/boomerang.js
@@ -1836,9 +1836,15 @@ BOOMR_check_doc_domain();
 			//
 			// Try the sendBeacon API first
 			//
-			if (w && w.navigator && typeof w.navigator.sendBeacon === "function") {
+			if (w && w.navigator &&
+			    typeof w.navigator.sendBeacon === "function" &&
+			    typeof w.Blob === "function") {
 				// note we're using sendBeacon with &sb=1
-				if (w.navigator.sendBeacon(impl.beacon_url, paramsJoined + "&sb=1")) {
+				var blobData = new w.Blob([paramsJoined + "&sb=1"], {
+					type: "application/x-www-form-urlencoded"
+				});
+
+				if (w.navigator.sendBeacon(impl.beacon_url, blobData)) {
 					return true;
 				}