From 922fec0ed38ebddf6887464414c111e4691e6bfb Mon Sep 17 00:00:00 2001
From: Brett <brett@vendia.net>
Date: Fri, 15 Jan 2021 13:07:00 +1000
Subject: [PATCH] fix: transform lambda edge response headers to lower case

---
 src/event-sources/aws/lambda-edge.js | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/event-sources/aws/lambda-edge.js b/src/event-sources/aws/lambda-edge.js
index fd4f1acb..b7297921 100644
--- a/src/event-sources/aws/lambda-edge.js
+++ b/src/event-sources/aws/lambda-edge.js
@@ -44,12 +44,13 @@ function getResponseToLambdaEdge ({
 }) {
   const headersMap = {}
   Object.entries(headers).forEach(([headerKey, headerValue]) => {
+    const headerKeyLowerCase = headerKey.toLowerCase()
     // Lambda@Edge fails if you include content-length
-    if (headerKey.toLowerCase() === 'content-length') return
-    if (!headersMap[headerKey]) headersMap[headerKey] = []
+    if (headerKeyLowerCase === 'content-length') return
+    if (!headersMap[headerKeyLowerCase]) headersMap[headerKeyLowerCase] = []
 
-    headersMap[headerKey].push({
-      key: headerKey,
+    headersMap[headerKeyLowerCase].push({
+      key: headerKeyLowerCase,
       value: headerValue
     })
   })