php artisan optimize breaks broadcasting/auth route (403) until composer dump-autoload

[zakiroof]

After deploying to our production server using Envoy, we encounter a 403 error on the /broadcasting/auth route. The issue is specifically tied to the php artisan optimize command. The issue is immediately resolved by running composer dump-autoload --optimize --no-dev. Everything works correctly until the next deployment when the cycle repeats.

Envoy.blade.php
Here is our deployment script for context:

@servers(['server' => $server])

@task('deploy')
    cd {{ $dir }}
    git pull origin {{ $branch }}
    composer install --optimize-autoloader --no-dev
    php artisan migrate --force
    php artisan optimize
    php artisan queue:restart
    php artisan reverb:restart
@endtask

Our current workaround is to add composer dump-autoload --optimize --no-dev to the Envoy script right after the php artisan optimize command. This fixes the issue, but it feels redundant and we'd like to understand the root cause. Or is this normal behavior?

[Sandalanka]

This is a subtle but real-world Laravel deployment edge case

This tells us the problem isn’t permissions or auth middleware — it’s autoloading or route caching behavior affected by optimize.

If any class (for example, your BroadcastServiceProvider or a closure-based route) isn’t available when the caches are generated, Laravel may:

Skip registering broadcast routes properly.

Cache an invalid reference to the broadcast auth route.

That’s why the /broadcasting/auth route ends up returning a 403 — the middleware stack or broadcaster guard fails to resolve correctly due to cached inconsistencies.

composer dump-autoload --optimize --no-dev

This command rebuilds the classmap and optimizes PSR-4 resolution.
It makes sure every provider (including broadcasting ones) are correctly autoloaded before Laravel rebuilds its caches

You can fix like this

composer install --optimize-autoloader --no-dev
composer dump-autoload --optimize --no-dev
php artisan config:cache
php artisan route:cache
php artisan view:cache
php artisan event:cache
php artisan queue:restart
php artisan reverb:restart