Load balancer proxy websocket

Good afternoon, I have a load balancer set up and I want to use websocket. But websocket does not work when proxying is enabled, and it is critical for me that websocket works when proxying is enabled. Could you please tell me if it has something to do with free tariff or this limitation is valid regardless of tariff plan? If it depends on tariff plan, then tell me what tariff I need for websockets to work with included proxying?

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