╔════════════════════════════════════════════════════════════════╗
║   WEBSOCKET ERROR FIX - FINAL RESOLUTION ✅                    ║
║                                                                ║
║   Issue: webpack-dev-server running alongside production      ║
║   Status: RESOLVED - December 17, 2025                        ║
╚════════════════════════════════════════════════════════════════╝

┌────────────────────────────────────────────────────────────────┐
│ ROOT CAUSE IDENTIFIED                                          │
└────────────────────────────────────────────────────────────────┘

  Multiple react-scripts dev servers were running on port 5100,
  serving the development build with webpack-dev-server embedded.
  
  The production systemd service couldn't bind to port 5100, OR
  the dev server was taking priority and serving bundle.js with
  insecure WebSocket (ws://) connections on HTTPS pages.

  Processes found:
  • PID 17302: react-scripts start
  • PID 17328: webpack-dev-server
  • PID 17418: react-scripts start  
  • PID 17419: react-scripts start
  • PID 17431: webpack-dev-server

┌────────────────────────────────────────────────────────────────┐
│ THE COMPLETE FIX                                               │
└────────────────────────────────────────────────────────────────┘

  Step 1: Kill ALL development servers
  $ pkill -9 -f "react-scripts"
  $ pkill -9 -f "webpack-dev-server"

  Step 2: Verify port 5100 is free
  $ sudo lsof -i :5100
  (Should return nothing)

  Step 3: Start production service
  $ sudo systemctl start church-music-frontend.service

  Step 4: Verify correct bundle
  $ curl http://localhost:5100/ | grep "\.js"
  (Should show main.6bb0b276.js, NOT bundle.js)

  Step 5: Test HTTPS
  $ curl https://houseofprayer.ddns.net/ | grep "\.js"
  (Should show main.6bb0b276.js, NOT bundle.js)

┌────────────────────────────────────────────────────────────────┐
│ VERIFICATION RESULTS                                           │
└────────────────────────────────────────────────────────────────┘

  ✅ Frontend service: Active (running)
  ✅ Serving: main.6bb0b276.js (production build)
  ✅ webpack-dev-server references: 0
  ✅ Port 5100: Only production serve process
  ✅ HTTPS: Serving correct production bundle
  ✅ WebSocket error: RESOLVED

┌────────────────────────────────────────────────────────────────┐
│ WHY THIS HAPPENED                                              │
└────────────────────────────────────────────────────────────────┘

  1. Development servers started (npm start / react-scripts)
  2. Left running in background (not properly stopped)
  3. Continued serving even after production service started
  4. Multiple instances accumulated over time
  5. Production build was correct, but wrong server was used

┌────────────────────────────────────────────────────────────────┐
│ SAFEGUARDS ADDED                                               │
└────────────────────────────────────────────────────────────────┘

  Enhanced cleanup-ports.sh:
  • Now detects and kills react-scripts processes
  • Kills webpack-dev-server processes
  • Reports what was found and cleaned

  Enhanced stop-dev-mode.sh:
  • Kills react-scripts start processes
  • Force kills webpack-dev-server (-9 signal)
  • Ensures clean shutdown

  Enhanced start-dev-mode.sh:
  • Checks for running production services
  • Warns about conflicts
  • Kills old dev processes before starting new

┌────────────────────────────────────────────────────────────────┐
│ NEVER DO THIS IN PRODUCTION                                   │
└────────────────────────────────────────────────────────────────┘

  ❌ npm start (runs webpack-dev-server)
  ❌ react-scripts start (development mode)
  ❌ Leaving dev servers running in background
  ❌ Running dev and prod simultaneously
  
  ✅ npm run build (creates production bundle)
  ✅ systemctl start church-music-frontend
  ✅ Always stop dev servers before production
  ✅ Use cleanup-ports.sh before deploying

┌────────────────────────────────────────────────────────────────┐
│ QUICK TROUBLESHOOTING                                          │
└────────────────────────────────────────────────────────────────┘

  If you see "bundle.js" error:
  
  1. Kill development servers:
     $ pkill -9 -f "react-scripts"
     $ pkill -9 -f "webpack-dev-server"
  
  2. Verify they're gone:
     $ ps aux | grep -E "react-scripts|webpack"
     (Should show nothing)
  
  3. Restart production service:
     $ sudo systemctl restart church-music-frontend
  
  4. Clear browser cache:
     • Ctrl+Shift+Delete (select "Cached images and files")
     • Or hard reload: Ctrl+Shift+R
  
  5. Verify fix:
     $ curl http://localhost:5100/ | grep "\.js"
     (Should show main.*.js, NOT bundle.js)

┌────────────────────────────────────────────────────────────────┐
│ AUTOMATED CLEANUP                                              │
└────────────────────────────────────────────────────────────────┘

  Use the cleanup script:
  $ ./cleanup-ports.sh
  
  This will automatically:
  • Check ports 8080 and 5100
  • Kill rogue processes
  • Clean up PID files
  • Kill development servers
  • Report all actions taken

┌────────────────────────────────────────────────────────────────┐
│ BROWSER TESTING                                                │
└────────────────────────────────────────────────────────────────┘

  1. Clear all browser data:
     • Ctrl+Shift+Delete
     • Select "Cached images and files"
     • Select "Last hour" or "All time"
     • Click "Clear data"
  
  2. Force reload:
     • Windows/Linux: Ctrl+Shift+R
     • Mac: Cmd+Shift+R
  
  3. Open developer console:
     • Press F12
     • Go to Console tab
  
  4. Navigate to site:
     • https://houseofprayer.ddns.net
  
  5. Verify:
     • No "WebSocket" errors
     • No "webpack-dev-server" errors
     • No "bundle.js" errors
     • App loads and works normally

┌────────────────────────────────────────────────────────────────┐
│ CURRENT STATUS                                                 │
└────────────────────────────────────────────────────────────────┘

  Services:
  ✅ Backend: Active (Gunicorn on port 8080)
  ✅ Frontend: Active (serve on port 5100)
  ✅ Production build: main.6bb0b276.js
  ✅ No development servers running
  
  Build Verification:
  ✅ 0 webpack-dev-server references
  ✅ 0 insecure WebSocket connections
  ✅ Clean production bundle
  ✅ Correct index.html being served

╔════════════════════════════════════════════════════════════════╗
║  ✅ WEBSOCKET ERROR COMPLETELY RESOLVED                        ║
║                                                                ║
║  The issue was NOT in the build, but in having multiple       ║
║  development servers running that served the wrong content.   ║
║                                                                ║
║  Solution: Kill all dev servers, use only production service  ║
╚════════════════════════════════════════════════════════════════╝

Next time: Always use ./cleanup-ports.sh before starting services!
