ターミナルで以下を打つ。
ターミナル
$ rails routes
Prefix Verb URI Pattern Controller#Action
root GET / static_pages#top
users POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
login GET /login(.:format) user_sessions#new
POST /login(.:format) user_sessions#create
logout DELETE /logout(.:format) user_sessions#destroy
board_comments POST /boards/:board_id/comments(.:format) comments#create
edit_comment GET /comments/:id/edit(.:format) comments#edit
comment DELETE /comments/:id(.:format) comments#destroy
boards GET /boards(.:format) boards#index
POST /boards(.:format) boards#create
new_board GET /boards/new(.:format) boards#new
board GET /boards/:id(.:format) boards#show
rails_postmark_inbound_emails POST /rails/action_mailbox/postmark/inbound_emails(.:format) action_mailbox/ingresses/postmark/inbound_emails#create
rails_relay_inbound_emails POST /rails/action_mailbox/relay/inbound_emails(.:format) action_mailbox/ingresses/relay/inbound_emails#create
rails_sendgrid_inbound_emails POST /rails/action_mailbox/sendgrid/inbound_emails(.:format) action_mailbox/ingresses/sendgrid/inbound_emails#create
rails_mandrill_inbound_health_check GET /rails/action_mailbox/mandrill/inbound_emails(.:format) action_mailbox/ingresses/mandrill/inbound_emails#health_check