@Taranjeet Malik , Appreciate your patience. Application Gateway supports only these protocols HTTP, HTTPS, HTTP/2 and WebSocket.
I recommend you to upvote it and other features that are of interest here in this feedback section. In general, Azure feature team would check feasibility of a feature request, triage it, prioritize against existing feature backlog, add in roadmap as appropriate and would announce and/or update the related Azure document once a feature request is addressed.
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Please do not forget to "Accept the answer" wherever the information provided helps you to help others in the community.