Update rdflib to 0.17.1.

Author: RubenVerborgh

package-lock.json

@@ -46,7 +46,7 @@
     "kvplus-files": "0.0.4",
     "li": "^1.3.0",
     "node-fetch": "^2.1.2",
-    "rdflib": "0.16.7",
+    "rdflib": "^0.17.1",
     "valid-url": "^1.0.9"
   },
   "devDependencies": {

package.json

@@ -101,16 +101,14 @@ function discoverFromProfile (webId) {
 
   return fetcher.load(webId, { force: true })
     .then(response => {
-      if (!response.ok) {
-        let error = new Error(`Could not reach Web ID ${webId} to discover provider`)
-        error.statusCode = 400
-        throw error
-      }
-
       let providerTerm = rdf.namedNode('http://www.w3.org/ns/solid/terms#oidcIssuer')
       let providerUri = store.anyValue(rdf.namedNode(webId), providerTerm)
-
       return providerUri
+    }, err => {
+      let error = new Error(`Could not reach Web ID ${webId} to discover provider`)
+      error.cause = err
+      error.statusCode = 400
+      throw error
     })
 }
 

src/preferred-provider.js

@@ -84,8 +84,8 @@ describe('preferred-provider.js', () => {
 
     it('should throw an error if web id is unreachable', done => {
       nock(serverUri)
-        .options('/')
-        .reply(404)
+        .get('/').reply(404)
+        .options('/').reply(404)
 
       provider.discoverProviderFor(webId)
         .catch(err => {