Use dynamic userinfo url

test/integration_tests/app.py

@@ -42,7 +42,7 @@ def index():
 @app.route("/userinfo")
 def info():
     if sso.authorized:
-        resp = sso.session.get("/userinfo")
+        resp = sso.session.get(USERINFO_URL)
         assert resp.ok
         return jsonify(json.loads(resp.content.decode()))
     else: