sparql-proxy

This middleware forwards SPARQL queries to a SPARQL endpoint. It supports GET and POST (direct and URL-encoded) query requests and basic authentication.

Usage

The module exports a function to build a middleware. The function must be called with a single options object. The following options are supported:

• endpointUrl: The URL of the SPARQL endpoint
• authentication: Credentials for basic authentication (object with user and password property)
• queryOperation: The query operation which will be used to access the SPARQL endpoint (default: postQueryDirect)
• fetchOptions: an object that will be merged (and potentially override) with node-fetch options used for the request from the proxy to the SPARQL endpoint. It can be used to override fetch headers: fetchOptions.headers

Example

// load the module
const sparqlProxy = require('sparql-proxy')

// create a middleware instance and add it to the routing
app.use(sparqlProxy({
  endpointUrl: 'https://dbpedia.org/sparql'
})

Debug

This package uses debug, you can get debug logging via: DEBUG=sparql-proxy.
Since Trifid makes heavy use of this package, using DEBUG=trifid:* also enables logging in this package.