By Yusuke Takita
こんにちは。Takitaです。
解決!
refs: https://github.com/BetterErrors/better_errors/issues/270#issuecomment-236236791
# vim config/initializers/better_errors.rb if Rails.env.development? BetterErrors::Middleware.allow_ip! '0.0.0.0/0' end