diff --git a/README.md b/README.md
index 8860b8f..e6c9f35 100644
--- a/README.md
+++ b/README.md
@@ -99,7 +99,7 @@ config :my_app_members, MyAppMembersWeb.Endpoint, server: false
   - `:host`
   - `:path`
   - `:phoenix_endpoint` / `:plug`
-  - `:opts` - only for `:plug`
+  - `:opts` - plug call options.
 - `:log_requests` - `true` by default. Log the requests or not.
 
 <!-- MDOC !-->
diff --git a/lib/main_proxy/plug.ex b/lib/main_proxy/plug.ex
index 5f11145..3decacb 100644
--- a/lib/main_proxy/plug.ex
+++ b/lib/main_proxy/plug.ex
@@ -13,11 +13,12 @@ defmodule MainProxy.Plug do
     backends = Keyword.fetch!(opts, :backends)
 
     backend = choose_backend(conn, backends)
+    opts = Map.get(backend, :opts, [])
     log_request("Backend chosen: #{inspect(backend)}")
 
     case backend do
-      %{phoenix_endpoint: phoenix_endpoint} -> phoenix_endpoint.call(conn, [])
-      %{plug: plug} -> plug.call(conn, [])
+      %{phoenix_endpoint: phoenix_endpoint} -> phoenix_endpoint.call(conn, opts)
+      %{plug: plug} -> plug.call(conn, opts)
     end
   end