Can't seem to run Rail in production mode locally - Stack Overflow

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I'm new to Rails and have managed to create a simple app that runs fine locally in development mode when started with bin/rails server. But when I started the app in production mode with bin/rails s -e production and sent my browser to http://localhost:3000/, I got back this error in the browser:

Access to localhost was denied
You don't have authorization to view this page.
HTTP ERROR 403

and this error in my terminal [ActionDispatch::HostAuthorization::DefaultResponseApp] Blocked hosts: localhost:3000.

As the server fires up, I see this in my terminal:

bob@RockBox www.br.ru % rails s -e production
=> Booting Puma
=> Rails 8.0.1 application starting in production
=> Run `bin/rails server --help` for more startup options
Puma starting in single mode...
* Puma version: 6.5.0 ("Sky's Version")
* Ruby version: ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x86_64-darwin24]
*  Min threads: 3
*  Max threads: 3
*  Environment: production
*          PID: 64067
* Listening on :3000
Use Ctrl-C to stop

My config/environments/production.rb (which I assume is being used) looks like:

require "active_support/core_ext/integer/time"

Rails.application.configure do
  # Settings specified here will take precedence over those in config/application.rb.

  # Code is not reloaded between requests.
  config.enable_reloading = false

  # Eager load code on boot for better performance and memory savings (ignored by Rake tasks).
  config.eager_load = true

  # Full error reports are disabled.
  config.consider_all_requests_local = false

  # Turn on fragment caching in view templates.
  config.action_controller.perform_caching = true

  # Cache assets for far-future expiry since they are all digest stamped.
  config.public_file_server.headers = { "cache-control" => "public, max-age=#{1.year.to_i}" }

  # Enable serving of images, stylesheets, and JavaScripts from an asset server.
  # config.asset_host = ";

  # Store uploaded files on the local file system (see config/storage.yml for options).
  config.active_storage.service = :local

  # Assume all access to the app is happening through a SSL-terminating reverse proxy.
  config.assume_ssl = false

  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
  config.force_ssl = false

  # Skip http-to-https redirect for the default health check endpoint.
  # config.ssl_options = { redirect: { exclude: ->(request) { request.path == "/up" } } }

  # Log to STDOUT with the current request id as a default log tag.
  config.log_tags = [ :request_id ]
  config.logger   = ActiveSupport::TaggedLogging.logger(STDOUT)

  # Change to "debug" to log everything (including potentially personally-identifiable information!)
  config.log_level = ENV.fetch("RAILS_LOG_LEVEL", "info")

  # Prevent health checks from clogging up the logs.
  config.silence_healthcheck_path = "/up"

  # Don't log any deprecations.
  config.active_support.report_deprecations = false

  # Replace the default in-process memory cache store with a durable alternative.
  config.cache_store = :solid_cache_store

  # Replace the default in-process and non-durable queuing backend for Active Job.
  config.active_job.queue_adapter = :solid_queue
  config.solid_queue.connects_to = { database: { writing: :queue } }

  # Ignore bad email addresses and do not raise email delivery errors.
  # Set this to true and configure the email server for immediate delivery to raise delivery errors.
  # config.action_mailer.raise_delivery_errors = false

  # Set host to be used by links generated in mailer templates.
  config.action_mailer.default_url_options = { host: "example" }

  # Specify outgoing SMTP server. Remember to add smtp/* credentials via rails credentials:edit.
  # config.action_mailer.smtp_settings = {
  #   user_name: Rails.application.credentials.dig(:smtp, :user_name),
  #   password: Rails.application.credentials.dig(:smtp, :password),
  #   address: "smtp.example",
  #   port: 587,
  #   authentication: :plain
  # }

  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
  # the I18n.default_locale when a translation cannot be found).
  config.i18n.fallbacks = true

  # Do not dump schema after migrations.
  config.active_record.dump_schema_after_migration = false

  # Only use :id for inspections in production.
  config.active_record.attributes_for_inspect = [ :id ]

  # Enable DNS rebinding protection and other `Host` header attacks.
  # config.hosts = [
  #   "example",     # Allow requests from example
  #   /.*\.example\/ # Allow requests from subdomains like `www.example`
  # ]
  #
  # Skip DNS rebinding protection for the default health check endpoint.
  # config.host_authorization = { exclude: ->(request) { request.path == "/up" } }
end

I'm at a loss for what to even look for, at this point. Help!

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