Basic element added: anchor and port

backend/server.py

@@ -6,7 +6,7 @@ import json
 import yaml
 from collections import OrderedDict
 from functools import wraps
-from flask import Flask, jsonify, send_from_directory, request, redirect, url_for, session, render_template
+from flask import Flask, jsonify, send_from_directory, request, redirect, url_for, session, render_template, make_response
 from werkzeug.security import check_password_hash
 import database  
 from flask import Response
@@ -36,6 +36,14 @@ app.json.sort_keys = False
 database.init_db()
 
 
+def no_cache_response(response):
+    """Prevent stale editor assets while canvas features are being revised."""
+    response.headers['Cache-Control'] = 'no-store, no-cache, must-revalidate, max-age=0'
+    response.headers['Pragma'] = 'no-cache'
+    response.headers['Expires'] = '0'
+    return response
+
+
 def login_required_json(view_func):
     @wraps(view_func)
     def wrapper(*args, **kwargs):
@@ -237,7 +245,13 @@ def canvas():
         return redirect(url_for('home'))
         
     # Note: Ensure your old index.html is renamed to canvas.html in the frontend folder
-    return render_template('canvas.html')
+    return no_cache_response(make_response(render_template('canvas.html')))
+
+
+@app.route('/canvas-helpers.js')
+def canvas_helpers():
+    """Serve the shared canvas helper script used by canvas.html."""
+    return no_cache_response(send_from_directory(FRONTEND_DIR, 'canvas-helpers.js'))
 
 @app.route('/logout')
 def logout():