heroku[router]: at=error code=H10 desc="App crashed" 方法
heroku[router]: at=error code=H10 desc="App crashed" method
在 Ruby 在 Rails - Heroku 部署，我得到了一个错误 heroku[route]: at=error code=H10 desc="App crashed" method 在一些调试日志文本之后，主要部分我得到的日志文件：
2022-01-08T11:12:12.754916+00:00 heroku[web.1]: Starting process with command `bin/rails server -p ${PORT:-5000} -e production`
2022-01-08T11:12:16.534794+00:00 app[web.1]: => Booting Puma
2022-01-08T11:12:16.534809+00:00 app[web.1]: => Rails 6.1.4.4 application starting in production
2022-01-08T11:12:16.534810+00:00 app[web.1]: => Run `bin/rails server --help` for more startup options
2022-01-08T11:12:17.742438+00:00 app[web.1]: Exiting
2022-01-08T11:12:17.745593+00:00 app[web.1]: /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:34:in `require': cannot load such file -- net/pop (LoadError)
2022-01-08T11:12:17.745616+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/zeitwerk-2.5.3/lib/zeitwerk/kernel.rb:35:in `require'
2022-01-08T11:12:17.745630+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail/network/retriever_methods/pop3.rb:36:in `<class:POP3>'
2022-01-08T11:12:17.745642+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail/network/retriever_methods/pop3.rb:35:in `<module:Mail>'
2022-01-08T11:12:17.745655+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail/network/retriever_methods/pop3.rb:4:in `<main>'
2022-01-08T11:12:17.745668+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
2022-01-08T11:12:17.745681+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
2022-01-08T11:12:17.745694+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
2022-01-08T11:12:17.745708+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
2022-01-08T11:12:17.745720+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
2022-01-08T11:12:17.745733+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/zeitwerk-2.5.3/lib/zeitwerk/kernel.rb:35:in `require'
2022-01-08T11:12:17.745745+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail.rb:54:in `block in eager_autoload!'
2022-01-08T11:12:17.745761+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail.rb:54:in `each'
2022-01-08T11:12:17.745774+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail.rb:54:in `eager_autoload!'
2022-01-08T11:12:17.745786+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/actionmailer-6.1.4.4/lib/action_mailer.rb:61:in `eager_load!'
2022-01-08T11:12:17.745799+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/application/finisher.rb:134:in `each'
2022-01-08T11:12:17.745811+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/application/finisher.rb:134:in `block in <module:Finisher>'
2022-01-08T11:12:17.745824+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/initializable.rb:32:in `instance_exec'
2022-01-08T11:12:17.745838+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/initializable.rb:32:in `run'
2022-01-08T11:12:17.745850+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/initializable.rb:61:in `block in run_initializers'
2022-01-08T11:12:17.745863+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:228:in `block in tsort_each'
2022-01-08T11:12:17.745875+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
2022-01-08T11:12:17.745888+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:431:in `each_strongly_connected_component_from'
2022-01-08T11:12:17.745900+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:349:in `block in each_strongly_connected_component'
2022-01-08T11:12:17.745913+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:347:in `each'
2022-01-08T11:12:17.745926+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:347:in `call'
2022-01-08T11:12:17.745938+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:347:in `each_strongly_connected_component'
2022-01-08T11:12:17.745950+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:226:in `tsort_each'
2022-01-08T11:12:17.745963+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:205:in `tsort_each'
2022-01-08T11:12:17.745975+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/initializable.rb:60:in `run_initializers'
2022-01-08T11:12:17.745988+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/application.rb:391:in `initialize!'
2022-01-08T11:12:17.746002+00:00 app[web.1]: from /app/config/environment.rb:5:in `<main>'
2022-01-08T11:12:17.746015+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
2022-01-08T11:12:17.746027+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
2022-01-08T11:12:17.746040+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
2022-01-08T11:12:17.746053+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
2022-01-08T11:12:17.746066+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
2022-01-08T11:12:17.746079+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/zeitwerk-2.5.3/lib/zeitwerk/kernel.rb:35:in `require'
2022-01-08T11:12:17.746092+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/activesupport-6.1.4.4/lib/active_support/dependencies.rb:332:in `block in require'
2022-01-08T11:12:17.746104+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/activesupport-6.1.4.4/lib/active_support/dependencies.rb:299:in `load_dependency'
2022-01-08T11:12:17.746117+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/activesupport-6.1.4.4/lib/active_support/dependencies.rb:332:in `require'
2022-01-08T11:12:17.746130+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:54:in `require_relative'
2022-01-08T11:12:17.746143+00:00 app[web.1]: from config.ru:3:in `block in <main>'
2022-01-08T11:12:17.746156+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/builder.rb:116:in `eval'
2022-01-08T11:12:17.746169+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/builder.rb:116:in `new_from_string'
2022-01-08T11:12:17.746181+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/builder.rb:105:in `load_file'
2022-01-08T11:12:17.746194+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/builder.rb:66:in `parse_file'
2022-01-08T11:12:17.746206+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:349:in `build_app_and_options_from_config'
2022-01-08T11:12:17.746219+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:249:in `app'
2022-01-08T11:12:17.746232+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:422:in `wrapped_app'
2022-01-08T11:12:17.746245+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:312:in `block in start'
2022-01-08T11:12:17.746258+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:379:in `handle_profiling'
2022-01-08T11:12:17.746270+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:311:in `start'
2022-01-08T11:12:17.746283+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/commands/server/server_command.rb:39:in `start'
2022-01-08T11:12:17.746297+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/commands/server/server_command.rb:144:in `block in perform'
2022-01-08T11:12:17.746309+00:00 app[web.1]: from <internal:kernel>:90:in `tap'
2022-01-08T11:12:17.746322+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/commands/server/server_command.rb:135:in `perform'
2022-01-08T11:12:17.746335+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/thor-1.2.1/lib/thor/command.rb:27:in `run'
2022-01-08T11:12:17.746348+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/thor-1.2.1/lib/thor/invocation.rb:127:in `invoke_command'
2022-01-08T11:12:17.746361+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/thor-1.2.1/lib/thor.rb:392:in `dispatch'
2022-01-08T11:12:17.746373+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/command/base.rb:69:in `perform'
2022-01-08T11:12:17.746386+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/command.rb:48:in `invoke'
2022-01-08T11:12:17.746399+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/commands.rb:18:in `<main>'
2022-01-08T11:12:17.746412+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
2022-01-08T11:12:17.746424+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
2022-01-08T11:12:17.746437+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
2022-01-08T11:12:17.746451+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
2022-01-08T11:12:17.746463+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
2022-01-08T11:12:17.746476+00:00 app[web.1]: from bin/rails:5:in `<main>'
2022-01-08T11:12:17.961296+00:00 heroku[web.1]: Process exited with status 1
2022-01-08T11:12:18.044550+00:00 heroku[web.1]: State changed from starting to crashed
虽然这是生产环境全文的主题，但是在本地开发环境中，启动Rails服务器时没有发现任何问题！在开发环境中一切正常。
此外，URL 显示了以下文本：
Application error An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command heroku logs --tail
And the console is showing this: Failed to load resource: the server responded with a status of 503 (Service Unavailable)
解决方案
好的，在修复了从日志文件中发现的错误后，我明白了，在我们的 Gemfile 中，我们需要添加一些 gem（大约 3 gems）这是某些依赖项所需要的。那些 gem 是：
# Gemfile
gem 'net-smtp', require: false
gem 'net-pop', require: false
gem 'net-imap', require: false
将这些添加到我们的 gem 文件后，运行
bundle install
然后将代码部署到 heroku 上，这将进行正确的部署。
在 Ruby 在 Rails - Heroku 部署，我得到了一个错误 heroku[route]: at=error code=H10 desc="App crashed" method 在一些调试日志文本之后，主要部分我得到的日志文件：
2022-01-08T11:12:12.754916+00:00 heroku[web.1]: Starting process with command `bin/rails server -p ${PORT:-5000} -e production`
2022-01-08T11:12:16.534794+00:00 app[web.1]: => Booting Puma
2022-01-08T11:12:16.534809+00:00 app[web.1]: => Rails 6.1.4.4 application starting in production
2022-01-08T11:12:16.534810+00:00 app[web.1]: => Run `bin/rails server --help` for more startup options
2022-01-08T11:12:17.742438+00:00 app[web.1]: Exiting
2022-01-08T11:12:17.745593+00:00 app[web.1]: /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:34:in `require': cannot load such file -- net/pop (LoadError)
2022-01-08T11:12:17.745616+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/zeitwerk-2.5.3/lib/zeitwerk/kernel.rb:35:in `require'
2022-01-08T11:12:17.745630+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail/network/retriever_methods/pop3.rb:36:in `<class:POP3>'
2022-01-08T11:12:17.745642+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail/network/retriever_methods/pop3.rb:35:in `<module:Mail>'
2022-01-08T11:12:17.745655+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail/network/retriever_methods/pop3.rb:4:in `<main>'
2022-01-08T11:12:17.745668+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
2022-01-08T11:12:17.745681+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
2022-01-08T11:12:17.745694+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
2022-01-08T11:12:17.745708+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
2022-01-08T11:12:17.745720+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
2022-01-08T11:12:17.745733+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/zeitwerk-2.5.3/lib/zeitwerk/kernel.rb:35:in `require'
2022-01-08T11:12:17.745745+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail.rb:54:in `block in eager_autoload!'
2022-01-08T11:12:17.745761+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail.rb:54:in `each'
2022-01-08T11:12:17.745774+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/mail-2.7.1/lib/mail.rb:54:in `eager_autoload!'
2022-01-08T11:12:17.745786+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/actionmailer-6.1.4.4/lib/action_mailer.rb:61:in `eager_load!'
2022-01-08T11:12:17.745799+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/application/finisher.rb:134:in `each'
2022-01-08T11:12:17.745811+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/application/finisher.rb:134:in `block in <module:Finisher>'
2022-01-08T11:12:17.745824+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/initializable.rb:32:in `instance_exec'
2022-01-08T11:12:17.745838+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/initializable.rb:32:in `run'
2022-01-08T11:12:17.745850+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/initializable.rb:61:in `block in run_initializers'
2022-01-08T11:12:17.745863+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:228:in `block in tsort_each'
2022-01-08T11:12:17.745875+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
2022-01-08T11:12:17.745888+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:431:in `each_strongly_connected_component_from'
2022-01-08T11:12:17.745900+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:349:in `block in each_strongly_connected_component'
2022-01-08T11:12:17.745913+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:347:in `each'
2022-01-08T11:12:17.745926+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:347:in `call'
2022-01-08T11:12:17.745938+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:347:in `each_strongly_connected_component'
2022-01-08T11:12:17.745950+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:226:in `tsort_each'
2022-01-08T11:12:17.745963+00:00 app[web.1]: from /app/vendor/ruby-3.1.0/lib/ruby/3.1.0/tsort.rb:205:in `tsort_each'
2022-01-08T11:12:17.745975+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/initializable.rb:60:in `run_initializers'
2022-01-08T11:12:17.745988+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/application.rb:391:in `initialize!'
2022-01-08T11:12:17.746002+00:00 app[web.1]: from /app/config/environment.rb:5:in `<main>'
2022-01-08T11:12:17.746015+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
2022-01-08T11:12:17.746027+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
2022-01-08T11:12:17.746040+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
2022-01-08T11:12:17.746053+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
2022-01-08T11:12:17.746066+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
2022-01-08T11:12:17.746079+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/zeitwerk-2.5.3/lib/zeitwerk/kernel.rb:35:in `require'
2022-01-08T11:12:17.746092+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/activesupport-6.1.4.4/lib/active_support/dependencies.rb:332:in `block in require'
2022-01-08T11:12:17.746104+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/activesupport-6.1.4.4/lib/active_support/dependencies.rb:299:in `load_dependency'
2022-01-08T11:12:17.746117+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/activesupport-6.1.4.4/lib/active_support/dependencies.rb:332:in `require'
2022-01-08T11:12:17.746130+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:54:in `require_relative'
2022-01-08T11:12:17.746143+00:00 app[web.1]: from config.ru:3:in `block in <main>'
2022-01-08T11:12:17.746156+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/builder.rb:116:in `eval'
2022-01-08T11:12:17.746169+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/builder.rb:116:in `new_from_string'
2022-01-08T11:12:17.746181+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/builder.rb:105:in `load_file'
2022-01-08T11:12:17.746194+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/builder.rb:66:in `parse_file'
2022-01-08T11:12:17.746206+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:349:in `build_app_and_options_from_config'
2022-01-08T11:12:17.746219+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:249:in `app'
2022-01-08T11:12:17.746232+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:422:in `wrapped_app'
2022-01-08T11:12:17.746245+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:312:in `block in start'
2022-01-08T11:12:17.746258+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:379:in `handle_profiling'
2022-01-08T11:12:17.746270+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/rack-2.2.3/lib/rack/server.rb:311:in `start'
2022-01-08T11:12:17.746283+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/commands/server/server_command.rb:39:in `start'
2022-01-08T11:12:17.746297+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/commands/server/server_command.rb:144:in `block in perform'
2022-01-08T11:12:17.746309+00:00 app[web.1]: from <internal:kernel>:90:in `tap'
2022-01-08T11:12:17.746322+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/commands/server/server_command.rb:135:in `perform'
2022-01-08T11:12:17.746335+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/thor-1.2.1/lib/thor/command.rb:27:in `run'
2022-01-08T11:12:17.746348+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/thor-1.2.1/lib/thor/invocation.rb:127:in `invoke_command'
2022-01-08T11:12:17.746361+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/thor-1.2.1/lib/thor.rb:392:in `dispatch'
2022-01-08T11:12:17.746373+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/command/base.rb:69:in `perform'
2022-01-08T11:12:17.746386+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/command.rb:48:in `invoke'
2022-01-08T11:12:17.746399+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/railties-6.1.4.4/lib/rails/commands.rb:18:in `<main>'
2022-01-08T11:12:17.746412+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
2022-01-08T11:12:17.746424+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
2022-01-08T11:12:17.746437+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/loaded_features_index.rb:100:in `register'
2022-01-08T11:12:17.746451+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
2022-01-08T11:12:17.746463+00:00 app[web.1]: from /app/vendor/bundle/ruby/3.1.0/gems/bootsnap-1.9.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
2022-01-08T11:12:17.746476+00:00 app[web.1]: from bin/rails:5:in `<main>'
2022-01-08T11:12:17.961296+00:00 heroku[web.1]: Process exited with status 1
2022-01-08T11:12:18.044550+00:00 heroku[web.1]: State changed from starting to crashed
虽然这是生产环境全文的主题，但是在本地开发环境中，启动Rails服务器时没有发现任何问题！在开发环境中一切正常。
此外，URL 显示了以下文本：
Application error An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command heroku logs --tail
And the console is showing this: Failed to load resource: the server responded with a status of 503 (Service Unavailable)
解决方案
好的，在修复了从日志文件中发现的错误后，我明白了，在我们的 Gemfile 中，我们需要添加一些 gem（大约 3 gems）这是某些依赖项所需要的。那些 gem 是：
# Gemfile
gem 'net-smtp', require: false
gem 'net-pop', require: false
gem 'net-imap', require: false
将这些添加到我们的 gem 文件后，运行
bundle install
然后将代码部署到 heroku 上，这将进行正确的部署。