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Using the HTTP REST Endpoint to Connect to a Neptune DB Instance
Amazon Neptune provides an HTTP endpoint for SPARQL queries. The REST interface is compatible with SPARQL version 1.1.
As discussed in Encryption in Transit: Connecting to Neptune Using SSL/HTTPS, the best practice is to connect to Neptune using HTTPS rather than HTTP. And in some Regions, you can only connect using HTTPS. The connection examples here all use HTTPS.
The following instructions walk you through connecting to the SPARQL endpoint using the curl command, connecting through HTTPS, and using HTTP syntax. Follow these instructions from an Amazon EC2 instance in the same virtual private cloud (VPC) as your Neptune DB instance.
The HTTP endpoint for SPARQL queries to a Neptune DB instance is:
https://.
your-neptune-endpoint:port/sparql
For information about finding the hostname of your Neptune DB instance, see the Connecting to Amazon Neptune Endpoints section.
QUERY Using HTTP POST
The following example uses curl to submit a SPARQL QUERY through HTTP POST.
curl -X POST --data-binary 'query=select ?s ?p ?o where {?s ?p ?o} limit 10' https://your-neptune-endpoint:port/sparql
The preceding example returns up to 10 of the triples (subject-predicate-object) in
the
graph by using the ?s ?p ?o query with a limit of 10. To query for something
else, replace it with another SPARQL query.
The default MIME media type of a response is application/sparql-results+json for
SELECT and ASK queries.
The default MIME type of a response is application/n-quads for
CONSTRUCT and DESCRIBE queries.
For a list of the media types used by Neptune for serialization, see RDF Serialization Formats Used by Neptune SPARQL.
UPDATE Using HTTP POST
The following example uses curl to submit a SPARQL UPDATE through HTTP POST.
curl -X POST --data-binary 'update=INSERT DATA { <https://test.com/s> <https://test.com/p> <https://test.com/o> . }' https://your-neptune-endpoint:port/sparql
The preceding example inserts the following triple into the SPARQL default graph:
<https://test.com/s> <https://test.com/p> <https://test.com/o>
