Use the configured http client options for mediaproxy

lib/pleroma/helpers/media_helper.ex

@@ -25,7 +25,7 @@ def missing_dependencies do
   end
 
   def image_resize(url, options) do
-    with {:ok, env} <- HTTP.get(url, [], pool: :media),
+    with {:ok, env} <- HTTP.get(url, [], http_client_opts()),
          {:ok, resized} <-
            Operation.thumbnail_buffer(env.body, options.max_width,
              height: options.max_height,
@@ -46,7 +46,7 @@ def image_resize(url, options) do
   def video_framegrab(url) do
     with executable when is_binary(executable) <- System.find_executable("ffmpeg"),
          false <- @cachex.exists?(:failed_media_helper_cache, url),
-         {:ok, env} <- HTTP.get(url, [], pool: :media),
+         {:ok, env} <- HTTP.get(url, [], http_client_opts()),
          {:ok, pid} <- StringIO.open(env.body) do
       body_stream = IO.binstream(pid, 1)
 
@@ -84,4 +84,6 @@ def video_framegrab(url) do
       {:error, _} = error -> error
     end
   end
+
+  defp http_client_opts, do: Pleroma.Config.get([:media_proxy, :proxy_opts, :http], pool: :media)
 end