@jhump I've tried this with HTTP_PROXY and HTTPS_PROXY and neither changed the behavior of grpcurl. I can see with the output of ss -ntp | grep grpcurl that it continued to connect directly instead of using my SSH tunnel.

Same here:

$ docker run --rm -e HTTP_PROXY=127.0.0.1:1234 fullstorydev/grpcurl api.grpc.me:443 list
grpc.reflection.v1alpha.ServerReflection
listennotes.v1.Podcasts

$ docker run --rm -e HTTPS_PROXY=127.0.0.1:1234 fullstorydev/grpcurl api.grpc.me:443 list
grpc.reflection.v1alpha.ServerReflection
listennotes.v1.Podcasts

$ docker run --rm -e HTTPS_PROXY=127.0.0.1:1234 -e GRPC_GO_LOG_VERBOSITY_LEVEL=99 -e GRPC_GO_LOG_SEVERITY_LEVEL=info fullstorydev/
grpcurl api.grpc.me:443 list
INFO: 2021/06/04 20:00:29 [core] parsed scheme: ""
INFO: 2021/06/04 20:00:29 [core] scheme "" not registered, fallback to default scheme
INFO: 2021/06/04 20:00:29 [core] ccResolverWrapper: sending update to cc: {[{api.grpc.me:443  <nil> 0 <nil>}] <nil> <nil>}
INFO: 2021/06/04 20:00:29 [core] ClientConn switching balancer to "pick_first"
INFO: 2021/06/04 20:00:29 [core] Channel switches to new LB policy "pick_first"
INFO: 2021/06/04 20:00:29 [core] Subchannel Connectivity change to CONNECTING
INFO: 2021/06/04 20:00:29 [core] Subchannel picks a new address "api.grpc.me:443" to connect
INFO: 2021/06/04 20:00:29 [core] pickfirstBalancer: UpdateSubConnState: 0xc0003504d0, {CONNECTING <nil>}
INFO: 2021/06/04 20:00:29 [core] Channel Connectivity change to CONNECTING
INFO: 2021/06/04 20:00:29 [core] Subchannel Connectivity change to READY
INFO: 2021/06/04 20:00:29 [core] pickfirstBalancer: UpdateSubConnState: 0xc0003504d0, {READY <nil>}
INFO: 2021/06/04 20:00:29 [core] Channel Connectivity change to READY
grpc.reflection.v1alpha.ServerReflection
listennotes.v1.Podcasts
INFO: 2021/06/04 20:00:29 [core] Channel Connectivity change to SHUTDOWN
INFO: 2021/06/04 20:00:29 [core] Subchannel Connectivity change to SHUTDOWN

Option to add proxy #166

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