Extract private Req.Finch (#380)

lib/req.ex

@@ -135,6 +135,8 @@ defmodule Req do
   @req Req.Request.new()
        |> Req.Steps.attach()
 
+  @default_finch_options Req.Finch.pool_options(%{})
+
   @doc """
   Returns a new request struct with built-in steps.
 
@@ -361,7 +363,8 @@ defmodule Req do
 
         * `:timeout` - socket connect timeout in milliseconds, defaults to `30_000`.
 
-        * `:protocols` - the HTTP protocols to use, defaults to `#{inspect(Req.Application.__default_protocols__())}`.
+        * `:protocols` - the HTTP protocols to use, defaults to
+          `#{inspect(Keyword.fetch!(@default_finch_options, :protocols))}`.
 
         * `:hostname` - Mint explicit hostname.
 

lib/req/application.ex

@@ -9,18 +9,12 @@ defmodule Req.Application do
       {Finch,
        name: Req.Finch,
        pools: %{
-         default: [
-           protocols: __default_protocols__()
-         ]
+         default: Req.Finch.pool_options(%{})
        }},
       {DynamicSupervisor, strategy: :one_for_one, name: Req.FinchSupervisor},
       {Req.Test.Ownership, name: Req.Test.Ownership}
     ]
 
     Supervisor.start_link(children, strategy: :one_for_one)
   end
-
-  def __default_protocols__ do
-    [:http1]
-  end
 end