From 48ee5fc6fbdd43bb9c425ef54df3085b36c7b1c5 Mon Sep 17 00:00:00 2001
From: jlippa <joe@jjssoftware.co.uk>
Date: Sun, 5 Jun 2016 08:27:39 +0100
Subject: [PATCH] Firefox fix

Overlay fix for Firefox and other clients that send additional data in the Connection header e.g. "Connection: Keep-Alive, Upgrade"
---
 src/WebSocketsServer.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/WebSocketsServer.cpp b/src/WebSocketsServer.cpp
index dbe0b34..ccde0cd 100644
--- a/src/WebSocketsServer.cpp
+++ b/src/WebSocketsServer.cpp
@@ -590,7 +590,8 @@ void WebSocketsServer::handleHeader(WSclient_t * client, String * headerLine) {
             String headerValue = headerLine->substring(headerLine->indexOf(':') + 2);
 
             if(headerName.equalsIgnoreCase("Connection")) {
-                if(headerValue.equalsIgnoreCase("Upgrade")) {
+                headerValue.toLowerCase();
+            	if(headerValue.indexOf("upgrade") >= 0) {
                     client->cIsUpgrade = true;
                 }
             } else if(headerName.equalsIgnoreCase("Upgrade")) {