There is however an RDF vocabulary for describing HTTP messages. You could use this to model a SKOS note as an HTTP response, e.g. ...
<A> rdf:type skos:Concept;
skos:prefLabel "The theory of general relativity"@en;
skos:note [
http:body "As embodied by the well known equation E=MC^2.";
http:content-type "text/plain";
http:content-language "en";
];
skos:note [
http:body """
As embodied by the well known equation <em>E</em> = <em>MC</em><sup>2</sup>.
"""^^rdfs:XMLLiteral;
http:content-type "application/xhtml+xml";
http:content-language "en";
];
.