I have elixir application which I am using with plug(no Phoenix), I was trying to upgrade it to cowboy2 from cowboy. I am using VS code for development, I keep getting following error when I am running server
** (Mix) Could not start application ok_api: exited in:
OkApi.start(:normal, [])
** (EXIT) an exception was raised:
** (FunctionClauseError) no function clause matching in :proplists.get_value/3
(stdlib) proplists.erl:215: :proplists.get_value(:num_acceptors, %{max_connections: 16384, num_acceptors: 100, socket_opts: [port: 4001]}, 10)
(ranch) /Users/ok/Documents/migration/ok_api/deps/ranch/src/ranch.erl:116: :ranch.child_spec/5
(plug_cowboy) lib/plug/cowboy.ex:183: Plug.Cowboy.child_spec/1
(ok_api) lib/ok_api.ex:92: OkApi.start/2
(kernel) application_master.erl:277: :application_master.start_it_old/4
this is my children config
children = [
Plug.Cowboy.child_spec(scheme: :http, plug: OkApi.Router, options: [port: 4001])
]
these 2 version I have in my mix.lock file
"plug": {:hex, :plug, "1.7.1", "8516d565fb84a6a8b2ca722e74e2cd25ca0fc9d64f364ec9dbec09d33eb78ccd", [:mix], [{:mime, "~> 1.0", [hex: :mime, optional: false]}, {:plug_crypto, "~> 1.0", [hex: :plug_crypto, optional: false]}]},
"plug_cowboy": {:hex, :plug_cowboy, "2.0.1", "d798f8ee5acc86b7d42dbe4450b8b0dadf665ce588236eb0a751a132417a980e", [:mix], [{:cowboy, "~> 2.5", [hex: :cowboy, optional: false]}, {:plug, "~> 1.7", [hex: :plug, optional: false]}]},
app is getting compiled fine but while running only this error is coming. please help.
When updating Cowboy to version 2, make sure you have explicitly updated both ranch and ranch_proxy_protocol to modern versions. Usually putting the line
{:ranch, "~> 1.7"}
into deps section of your mix.exs file would resolve an issue.