diff -r a76bae4795d5 -r 48f5380c26d0 server/src/app/Providers/SparqlClientServiceProvider.php
--- a/server/src/app/Providers/SparqlClientServiceProvider.php	Thu Apr 06 11:29:14 2017 +0200
+++ b/server/src/app/Providers/SparqlClientServiceProvider.php	Fri Jun 09 15:22:02 2017 +0200
@@ -14,7 +14,8 @@
             'CorpusParole\Libraries\Sparql\SparqlClient',
             function($app) {
                 $httpClient = $app->make('GuzzleHttp\Client', [[ 'base_uri' => config('corpusparole.rdf4j_query_url'), 'http_errors' => false]]);
-                $sparqlClient = $app->make('EasyRdf\Sparql\Client', [config('corpusparole.rdf4j_query_url'), config('corpusparole.rdf4j_update_url')]);
+                // we create another guzzle client to avoid interference with the base_uri parameter
+                $sparqlClient = $app->make('CorpusParole\Libraries\Sparql\GuzzleSparqlClient', [$app['Guzzle'], config('corpusparole.rdf4j_query_url'), config('corpusparole.rdf4j_update_url')]);
                 return new SparqlClient($httpClient, $sparqlClient);
             }
         );