Endpoint config when deploying to Gigalixir using mix

# prod.exs
config :bob_versions_web, BobVersionsWeb.Endpoint,
  http: [:inet6, port: System.get_env("PORT") || 4000],
  url: [scheme: "https", port: 443],
  force_ssl: [rewrite_on: [:x_forwarded_proto], host: nil],
  check_origin: ["//*.kobrakai.de", "//*.gigalixirapp.com"]

# releases.exs
config :bob_versions_web, BobVersionsWeb.Endpoint,
  secret_key_base: System.fetch_env!("SECRET_KEY_BASE")

This is what I deploy to gigalixir using releases.

Generally you should not need to configure url: [host: …] unless you’re using MyAppWeb.Endpoint for url generation (of non-relative paths) instead of a conn. The latter does hold the current request host and simply uses that one.

Oh

I use MyAppWeb.Endpoint when I use a path helper (Routes) to create a url to display.

Not so many though, so I’ll refactor and use the conn instead and hope that’ll fix it.

Thanks!

Changed my url generating code to use conn instead of MyAppWeb.Endpoint.

From:
Routes.v1_authentication_url(MyAppWeb.Endpoint, :register)
To:
Routes.v1_authentication_url(conn, :register)

Switched prod.exs back from whence it came
url: [nil, port: 80],

Behaviour of deployed app unchanged
http://localhost/api/v1/register

The config follows the docs

“Whenever possible prefer to pass a conn (or @conn in your views) in place of an Endpoint .”

Hmmm,

On the server

IO.inspect(conn.host)
app_name.gigalixir.com (also set in the req headers)

But,
IO.inspect(Routes.v1_authentication_url(conn, :register))
http://localhost/…

I’m clearly missing something fundamental to how the path helpers work … will investigate

Phoenix.Router.Helpers matches on %Conn{private: private}. There are 2 possibles for private either %{phoenix_router_url: _} or %{phoenix_endpoint: _}.

My conn only has phoenix_endpoint set. The upshot is a call to endpoint.url() in Phoenix.Endpoint. Which gets it’s info from prod.exs and defaults to [host: "localhost", path: "/"]

So, I’m still no further forward. I’m not sure how url [nil, port:80] in the Gigalixir docs works - clearly in my case it doesn’t.

I need my links to work, so I’m going to fallback to simply String replacing with a hardcoded app name on the result of the helper. If anyone can throw light on why my config doesn’t work I’d be interested to learn more.

Maybe I was wrong with the host of the conn being picked up. The one app I have in production with urls (emails) needs to deal with subdomains, so I have handling for that anyways.

If all you have is one domain you can set it to url: [host: "wherever_domain.com"]. That’s at least better than using some string replacement.

I’ve had to literally replace localhost with this tiny helper to make progress. Would like the permanent fix, but this works.

def route(route) do
case Mix.env() do
:prod →
String.replace_leading(route,“http://localhost”, “https://my-app-name.gigalixirapp.com”)
_ → route
end
end

I did try that among the various options - just hard coding the Gigalixir app name like that. But it didn’t get picked up. There must be something else that’s wrong somewhere. Time to move on

Are you sure you added it to url: […] and not http: []? The :url config is meant for that exact case.

I’m never sure when it comes to deployment, but happens you’re right! I thought I’d tried that, but clearly I hadn’t. Thanks for making me persist +1