Update app.py

app.py

@@ -59,6 +59,14 @@ def get_ip_version_from_ip(target):
     except ValueError:
         return 'ipv4'
 
+@app.route("/ping")
+def ping():
+    return "pong"
+
+@app.errorhandler(404)
+def page_not_found(e):
+    return render_template("404.html"), 404
+
 @app.route('/')
 def index():
     return render_template('looking_glass.html')