To make docker API REST calls on 0.0.0.0:2376 run sudo ncat -kl -p 2376 -c 'ncat -U /run/docker.sock'
It is useful when you need to write a plugin and inspect API, yes you can use curl directly on socket, as shown in the examples below, but there is no option to use Postman this way, (at least I do not know any.)
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Selext image
curl -s --unix-socket /var/run/docker.sock 0.0.0.0/v1.42/images/json | jq -r '.[] | select(.RepoTags[] | test("alpine:*")) | .RepoTags[0]'
Get id, inspect, show stat and kill container.
$ id="$(curl -s --unix-socket /var/run/docker.sock 0.0.0.0/v1.42/containers/json | jq -r '.[0].Id')"
$ curl -s --unix-socket "/var/run/docker.sock 0.0.0.0/v1.42/containers/${id}/json"
$ curl -s --unix-socket "/var/run/docker.sock 0.0.0.0/v1.42/containers/${id}/stats"
$ curl -s -XPOST --unix-socket "/var/run/docker.sock 0.0.0.0/v1.42/containers/${id}/kill"