Mosaic on older browsers

[spyder]

Hi,

I would like to use an old original iPad with Mosaic. Unfortunately, I can only get IOS 5.1.1 with Safari or Chrome 29.0.1547.11.

Mosaic shows and I can navigate between screens, but when I toggle a light, nothing happens. I suspect it has something to do with web sockets. When I sniff the traffic, I can see that the websocket connection cannot be set up:

GET /apps/localbus.lp HTTP/1.1
Upgrade: WebSocket
Connection: Upgrade
Host: 192.168.1.200
Origin: http://192.168.1.200
Cookie: user_language=
Sec-WebSocket-Key1: yx 2j/6 #  {Q 519N  W7 2=13  0F
Sec-WebSocket-Key2: 1^7   5 3  4 70 5 3  2 

HTTP/1.1 200 OK
Server: nginx
Date: Tue, 25 Dec 2018 22:17:01 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Content-Length: 61

websocket init failed: bad 'sec-websocket-key' request header

Can Mosaic work without web sockets?

Thanks!

Kristof