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Add option to disable pre-flight request for SPARQL store #679
Sometimes data providers reject the CORS preflight request, so this adds an option for disabling that, in particular for SPARQL data stores
This dojo FAQ page discusses the technique https://www.sitepen.com/blog/2014/01/15/faq-cors-with-dojo/
The Apollo hackathon uncovered that this patch was needed for a wikidata query
Ideally the data provider i.e. wikidata would accept the CORS request out of the box, but this seems like a needed workaround
Looks good to me. I'll let @enuggetry have a final look at it. Just trying to think of a case where we would want to have enabled pre-flight requests.
Look at: http://stackoverflow.com/questions/15381105/cors-what-is-the-motivation-behind-introducing-preflight-requests . . . probably none.