change oekg sparql endpoint view method to post

oekg/views.py

@@ -2,7 +2,7 @@
 from django.core.exceptions import SuspiciousOperation
 from django.http import HttpResponseBadRequest, JsonResponse
 from django.shortcuts import render
-from django.views.decorators.http import require_GET
+from django.views.decorators.http import require_POST
 
 from oeplatform.settings import OEKG_SPARQL_ENDPOINT_URL
 from oekg.utils import validate_sparql_query
@@ -14,9 +14,9 @@ def main_view(request):
     return response
 
 
-@require_GET
+@require_POST
 def sparql_endpoint(request):
-    sparql_query = request.GET.get("query", "")
+    sparql_query = request.POST.get("query", "")
 
     if not sparql_query:
         return HttpResponseBadRequest("Missing 'query' parameter.")