Fix error views so they return the correct HTTP status

basics/views.py

@@ -15,13 +15,17 @@ def disclaimer(request):
     return render(request, 'basics/disclaimer.html', {})
 
 def notfound(request):
-    return render(request, 'basics/notfound.html', {})
+    body = render_to_string('basics/notfound.html', {})
+    return HttpResponse(body, status_code = 404)
 
 def serverror(request):
-    return render(request, 'basics/serverror.html', {})
+    body = render_to_string('basics/serverror.html', {})
+    return HttpResponse(body, status_code = 500)
 
 def forbidden(request):
-    return render(request, 'basics/forbidden.html', {})
+    body = render_to_string('basics/forbidden.html', {})
+    return HttpResponse(body, status_code = 403)
 
 def badrequest(request):
-    return render(request, 'basics/badrequest.html', {})
+    body = render_to_string('basics/badrequest.html', {})
+    return HttpResponse(body, status_code = 400)