Update app.py

app.py

@@ -1,4 +1,4 @@
-from flask import Flask, send_from_directory
+from flask import Flask, send_from_directory, redirect
 
 app = Flask(__name__, static_folder='.', static_url_path='/')
 
@@ -8,8 +8,14 @@ def index():
 
 @app.route('/league')
 def league():
+    # Serve the league page (alias)
     return send_from_directory('.', 'league.html')
 
+@app.route('/league/')
+def league_trailing_slash():
+    # Redirect trailing slash to canonical path
+    return redirect('/league.html')
+
 @app.route('/league.html')
 def league_html():
     # Alias to support environments that request the .html path explicitly