Used case insensitive recognition for upgrade header. Should work as before, but also with servers that wrongly use lower case upgrade in the header

Thorsten Freitag · Thorsten Freitag · commit dd14850bb67c · 2016-05-10T11:56:01.000+10:00
diff --git 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")) {

Original file line number	Diff line number	Diff line change
`@@ -448,7 +448,7 @@ void WebSocketsClient::handleHeader(WSclient_t * client, String * headerLine) {`
`448`	`448`	`String headerValue = headerLine->substring(headerLine->indexOf(':') + 2);`
`449`	`449`
`450`	`450`	`if(headerName.equalsIgnoreCase("Connection")) {`
`451`		`- if(headerValue.indexOf("upgrade") >= 0) {`
	`451`	`+ if(headerValue.equalsIgnoreCase("upgrade")) {`
`452`	`452`	`client->cIsUpgrade = true;`
`453`	`453`	`}`
`454`	`454`	`} else if(headerName.equalsIgnoreCase("Upgrade")) {`