Azure Relay Hybrid connection - HTTP protocol vs WebSockets

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Using "Azure Relay Hybrid Connection" while sending and receiving messages using the websocket protocol, if there is delay in receiving the response no exception occurred.

But when sending and receiving messages to "Azure Relay Hybrid Connection" using HTTP protocol and if there is more than 60secs delay in receiving the response, error response received which says 504 Gateway Time-out exception & exception message says "The request was routed to the listener but the listener did not respond in the required time', Why??

Since it is HTTP protocol, it can't be keep the connection open forever like websocket?

In "Azure Relay Hybrid Connection" while using HTTP protocol, by default 'Gateway Time-out' is 60secs, how to extend the default timeout duration?

Timed-out requests can be retried?

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