Proxying https request is not working when adjusting response in custom plugin

Dears,
I have a custom plugin where I want to adjust upstream response (call…enable_buffering(), and adding json to http response during body_filter phase).
I created new route and upstream to handle HTTPS endpoints, but kong is triggering an error when I try to test my api through kong proxy:I got following error:

buffered proxying cannot currently be enabled with http/2, please use http/1.x instead, client: 172.18.0.1, server: kong, request: "GET /api/target?roomName=1…

It seems my curl command uses by default http2 when calling https request.

please how can I proxy https request through kong and adjust upstream response accordingly?

find below more details:

kong error: buffered proxying cannot currently be enabled with http/2, please use http/1.x

#route → service
/api/target/-> /upstreamService

#https request not working through kong
curl -kv --get --location ‘https://localhost:8443/api/target?roomName=1

server logs:

/kong/plugins/custom-auth/handler.lua:105: buffered proxying cannot currently be enabled with http/2, please use http/1.x instead, client: 172.18.0.1, server: kong, request: "GET /api/target?roomName=1

#https working request , forcing http1.1:

curl --get -kv --location --http1.1 ‘https://localhost:8443/api/target?roomName=1
result success response 200

#enable buffering in access phase
kong.service.request.enable_buffering()

Thank you,