Bad or missing request headers on DESCRIBE/CONSTRUCT queries

[der]

Report that Accept headers used by Elda for DESCRIBE and CONSTRUCT queries.

Verify whether Elda actually produces CONSTRUCT queries.

[simonoakesepimorphics]

ELDA invokes construct queries in the following places:

• Extractor.constructLicenceQuery
• View.fetchByGivenPropertyChains
• View.addAllObjectLabels
• View.viewByTemplate

As far as I can tell the Accept header for describe and construct queries are both determined by QueryEngineHTTP.modelContentType whose default value is application/rdf+xml . This value is never changed by ELDA.

It would be useful to know the scenario where wrong Accept headers are set and what the values are for further investigation.