Unable to load a remote context

I apologize if this is not the correct place for this question; Google could not find any place better.

I am experimenting with JSON-LD and I am having a problem loading a remote context, I keep getting the error “Derefencing a URL did not result in a valid JSON-LD object”.  (Full error message is included below).

I have copied the context from http://json-ld.org/contexts/person to our server (http://vocab.lappsgrid.org/person.jsonld) and I am testing on the JSON-LD playground (http://json-ld.org/playground/).  My first thought was that the content-type of the returned document is incorrect, but I’ve double checked and the content-type returned is application/ld+json so I do not know what else could be wrong; as far as I can tell the two contexts are identical as are the relevant HTTP headers.

My test input is simply:

{
	"@context": "http://vocab.lappsgrid.org/person.jsonld"
}

Can anyone spot the problem? I am stumped.

The full error message is:

{ "name": "jsonld.InvalidUrl", "message": "Derefencing a URL did not result in a valid JSON-LD object. Possible causes are an inaccessible URL perhaps due to a same-origin policy (ensure the server uses CORS if you are using client-side JavaScript), too many redirects, a non-JSON response, or more than one HTTP Link Header was provided for a remote context.", "details": { "code": "loading remote context failed", "url": "http://vocab.lappsgrid.org/person.jsonld", "cause": { "name": "jsonld.LoadDocumentError", "message": "URL could not be dereferenced, an error occurred.", "details": { "code": "loading document failed", "url": "http://vocab.lappsgrid.org/person.jsonld", "cause": "" } } } }

Thanks in advance.
Keith Suderman

P.S. I also noticed a small spelling mistake in the error message; “Derefencing” instead of “Dereferencing”.  I can prepare a pull request if anyone wants it.


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Research Associate
Department of Computer Science
Vassar College
Poughkeepsie, NY