This is a proxy for SPARQL endpoints, to avoid CORS or security issues, when an HTML page deployed on an https server wants to query
a SPARQL service deployed on a http server.
The proxy simply works by issuing SPARQL query to sparql?endpoint={your-encoded-sparql-endpoint-url}. These URL are SPARQL-compliant endpoints, and in particular
they expect a query URL parameter
Here is a test link : sparql?query=SELECT%20%2A%20WHERE%20%7B%3Fs%20%3Fp%20%3Fo%7D%20LIMIT%2010&endpoint=http%3A%2F%2Fdbpedia.org%2Fsparql
/!\ Warning: of course this is only a temporary workaround, you must not use this proxy in production !