From dd14850bb67cc3ee5d856c86d5d0110494b834f7 Mon Sep 17 00:00:00 2001
From: Thorsten Freitag <me@thorstenfreitag.com>
Date: Tue, 10 May 2016 11:56:01 +1000
Subject: [PATCH] Used case insensitive recognition for upgrade header. Should
 work as before, but also with servers that wrongly use lower case upgrade in
 the header

---
 src/WebSocketsClient.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/WebSocketsClient.cpp b/src/WebSocketsClient.cpp
index f8821e5..a0bb6a5 100644
--- a/src/WebSocketsClient.cpp
+++ b/src/WebSocketsClient.cpp
@@ -448,7 +448,7 @@ void WebSocketsClient::handleHeader(WSclient_t * client, String * headerLine) {
             String headerValue = headerLine->substring(headerLine->indexOf(':') + 2);
 
             if(headerName.equalsIgnoreCase("Connection")) {
-                if(headerValue.indexOf("upgrade") >= 0) {
+                if(headerValue.equalsIgnoreCase("upgrade")) {
                     client->cIsUpgrade = true;
                 }
             } else if(headerName.equalsIgnoreCase("Upgrade")) {