blockscout/apps/explorer_web/config/prod.exs

use Mix.Config

# For production, we often load configuration from external
# sources, such as your system environment. For this reason,
# you won't find the :http configuration below, but set inside
# ExplorerWeb.Endpoint.init/2 when load_from_system_env is
# true. Any dynamic configuration should be done there.
#
# Don't forget to configure the url host to something meaningful,
# Phoenix uses this information when generating URLs.
#
# Finally, we also include the path to a cache manifest
# containing the digested version of static files. This
# manifest is generated by the mix phx.digest task
# which you typically run after static files are built.
config :explorer_web, ExplorerWeb.Endpoint,
  cache_static_manifest: "priv/static/cache_manifest.json",
  force_ssl: [rewrite_on: [:x_forwarded_proto]],
  instrumenters: [NewRelixir.Instrumenters.Phoenix],
  load_from_system_env: true,
  pubsub: [
    adapter: Phoenix.PubSub.Redis,
    url: System.get_env("REDIS_URL"),
    node_name: System.get_env("DYNO")
  ],
  secret_key_base: System.get_env("SECRET_KEY_BASE"),
  url: [
    scheme: "https",
    host: Map.fetch!(System.get_env(), "HEROKU_APP_NAME") <> ".herokuapp.com",
    port: 443
  ]