diff --git a/server/src/server.js b/server/src/server.js
index d6bf765..4296a05 100755
--- a/server/src/server.js
+++ b/server/src/server.js
@@ -34,7 +34,9 @@ const server = new ApolloServer({
   plugins: [
     responseCachePlugin({
       sessionId: requestContext =>
-        requestContext.request.http.headers.get('Authorization') || null
+        requestContext.request.http.headers.get('Authorization') ||
+        requestContext.request.http.headers.get('authorization') ||
+        null
     })
   ]
 })