correct pool and uniform headers format

lib/mix/tasks/pleroma/frontend.ex

@@ -124,7 +124,9 @@ defp download_build(frontend_info, dest) do
     url = String.replace(frontend_info["build_url"], "${ref}", frontend_info["ref"])
 
     with {:ok, %{status: 200, body: zip_body}} <-
-           Pleroma.HTTP.get(url, [], timeout: 120_000, recv_timeout: 120_000) do
+           Pleroma.HTTP.get(url, [],
+             adapter: [pool: :media, timeout: 120_000, recv_timeout: 120_000]
+           ) do
       unzip(zip_body, dest)
     else
       e -> {:error, e}

lib/pleroma/instances/instance.ex

@@ -150,7 +150,9 @@ def get_or_update_favicon(%URI{host: host} = instance_uri) do
   defp scrape_favicon(%URI{} = instance_uri) do
     try do
       with {:ok, %Tesla.Env{body: html}} <-
-             Pleroma.HTTP.get(to_string(instance_uri), [{:Accept, "text/html"}]),
+             Pleroma.HTTP.get(to_string(instance_uri), [{"accept", "text/html"}],
+               adapter: [pool: :media]
+             ),
            favicon_rel <-
              html
              |> Floki.parse_document!()

lib/pleroma/object/fetcher.ex

@@ -164,12 +164,12 @@ defp make_signature(id, date) do
         date: date
       })
 
-    [{"signature", signature}]
+    {"signature", signature}
   end
 
   defp sign_fetch(headers, id, date) do
     if Pleroma.Config.get([:activitypub, :sign_object_fetches]) do
-      headers ++ make_signature(id, date)
+      [make_signature(id, date) | headers]
     else
       headers
     end
@@ -177,7 +177,7 @@ defp sign_fetch(headers, id, date) do
 
   defp maybe_date_fetch(headers, date) do
     if Pleroma.Config.get([:activitypub, :sign_object_fetches]) do
-      headers ++ [{"date", date}]
+      [{"date", date} | headers]
     else
       headers
     end

lib/pleroma/web/rich_media/helpers.ex

@@ -96,6 +96,6 @@ def rich_media_get(url) do
         @rich_media_options
       end
 
-    Pleroma.HTTP.get(url, headers, options)
+    Pleroma.HTTP.get(url, headers, adapter: options)
   end
 end

lib/pleroma/web/web_finger/web_finger.ex

@@ -136,12 +136,12 @@ def get_template_from_xml(body) do
 
   def find_lrdd_template(domain) do
     with {:ok, %{status: status, body: body}} when status in 200..299 <-
-           HTTP.get("http://#{domain}/.well-known/host-meta", []) do
+           HTTP.get("http://#{domain}/.well-known/host-meta") do
       get_template_from_xml(body)
     else
       _ ->
         with {:ok, %{body: body, status: status}} when status in 200..299 <-
-               HTTP.get("https://#{domain}/.well-known/host-meta", []) do
+               HTTP.get("https://#{domain}/.well-known/host-meta") do
           get_template_from_xml(body)
         else
           e -> {:error, "Can't find LRDD template: #{inspect(e)}"}

test/support/http_request_mock.ex

@@ -1350,11 +1350,11 @@ def get("https://relay.mastodon.host/actor", _, _, _) do
     {:ok, %Tesla.Env{status: 200, body: File.read!("test/fixtures/relay/relay.json")}}
   end
 
-  def get("http://localhost:4001/", _, "", Accept: "text/html") do
+  def get("http://localhost:4001/", _, "", [{"accept", "text/html"}]) do
     {:ok, %Tesla.Env{status: 200, body: File.read!("test/fixtures/tesla_mock/7369654.html")}}
   end
 
-  def get("https://osada.macgirvin.com/", _, "", Accept: "text/html") do
+  def get("https://osada.macgirvin.com/", _, "", [{"accept", "text/html"}]) do
     {:ok,
      %Tesla.Env{
        status: 200,