The best replacement for websocket is ajax.

The best alternatives to websocket are rated as following:
★★★★★  ajax
★★★★★  socket.io
★★★★  http
★★★★  socket
★★★  tcp
★★  mqtt
★★  udp
★  raw socket
★  comet

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No companions for websocket have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of websocket in all years. Click on graph for more.
websocket
ajax
socket.io