The rdf-pub server Profile is located under the root URL:

http://localhost:8081/

Get profile in turtle
curl --location --request GET 'http://localhost:8081/' \
--header 'Accept: text/turtle'
Turtle response
<http://localhost:8081/> a <https://www.w3.org/ns/activitystreams#Application>;
  <https://schema.org/identifier> "0b871c4a-a7bf-47ea-bd45-6b4be8df0690";
  <https://schema.org/version> "1"^^<http://www.w3.org/2001/XMLSchema#long>;
  <https://www.w3.org/ns/activitystreams#Public> <http://localhost:8081/asPublic>;
  <https://www.w3.org/ns/activitystreams#inbox> <http://localhost:8081/inbox>;
  <https://www.w3.org/ns/activitystreams#outbox> <http://localhost:8081/outbox>;
  <https://linkedopenactors.org/ns/rdfpub#version> "0.0.6-SNAPSHOT";
  <https://rdf-pub.org/commitId> "5343ae5";
  <https://linkedopenactors.org/ns/rdfpub#publicSparql> <http://localhost:8081/asPublic/sparql>;
  <https://www.w3.org/ns/activitystreams#preferredUsername> "rdf-pub-server";
  <https://www.w3.org/ns/activitystreams#endpoints> <http://localhost:8081/endpoints> .
Get profile in json-ld
curl --location --request GET 'http://localhost:8081/' \
--header 'Accept: application/ld+json'
JsonLd response
[
    {
        "@graph": [
            {
                "@id": "http://localhost:8081/",
                "@type": [
                    "https://www.w3.org/ns/activitystreams#Application"
                ],
                "https://linkedopenactors.org/ns/rdfpub#publicSparql": [
                    {
                        "@id": "http://localhost:8081/asPublic/sparql"
                    }
                ],
                "https://linkedopenactors.org/ns/rdfpub#version": [
                    {
                        "@value": "0.0.6-SNAPSHOT"
                    }
                ],
                "https://rdf-pub.org/commitId": [
                    {
                        "@value": "5343ae5"
                    }
                ],
                "https://schema.org/identifier": [
                    {
                        "@value": "0b871c4a-a7bf-47ea-bd45-6b4be8df0690"
                    }
                ],
                "https://schema.org/version": [
                    {
                        "@type": "http://www.w3.org/2001/XMLSchema#long",
                        "@value": "1"
                    }
                ],
                "https://www.w3.org/ns/activitystreams#Public": [
                    {
                        "@id": "http://localhost:8081/asPublic"
                    }
                ],
                "https://www.w3.org/ns/activitystreams#endpoints": [
                    {
                        "@id": "http://localhost:8081/endpoints"
                    }
                ],
                "https://www.w3.org/ns/activitystreams#inbox": [
                    {
                        "@id": "http://localhost:8081/inbox"
                    }
                ],
                "https://www.w3.org/ns/activitystreams#outbox": [
                    {
                        "@id": "http://localhost:8081/outbox"
                    }
                ],
                "https://www.w3.org/ns/activitystreams#preferredUsername": [
                    {
                        "@value": "rdf-pub-server"
                    }
                ]
            }
        ],
        "@id": "https://www.w3.org/ns/activitystreams#Public"
    }
]