diff --git a/lib/pleroma/http/connection.ex b/lib/pleroma/http/connection.ex
index ef1c1cabd..6cb26c0fe 100644
--- a/lib/pleroma/http/connection.ex
+++ b/lib/pleroma/http/connection.ex
@@ -9,8 +9,7 @@ defmodule Pleroma.HTTP.Connection do
 
   @options [
     connect_timeout: 10_000,
-    timeout: 20_000,
-    protocols: [:http]
+    timeout: 20_000
   ]
 
   @doc """
@@ -24,8 +23,7 @@ defmodule Pleroma.HTTP.Connection do
   def new(opts \\ []) do
     middleware = [Tesla.Middleware.FollowRedirects]
     adapter = Application.get_env(:tesla, :adapter)
-    options = options(opts)
-    Tesla.client(middleware, {adapter, options})
+    Tesla.client(middleware, {adapter, options(opts)})
   end
 
   # fetch http options
diff --git a/lib/pleroma/http/http.ex b/lib/pleroma/http/http.ex
index d493a8b4a..21c057f4b 100644
--- a/lib/pleroma/http/http.ex
+++ b/lib/pleroma/http/http.ex
@@ -45,9 +45,9 @@ defmodule Pleroma.HTTP do
 
       %{}
       |> Builder.method(method)
+      |> Builder.url(url)
       |> Builder.headers(headers)
       |> Builder.opts(options)
-      |> Builder.url(url)
       |> Builder.add_param(:body, :body, body)
       |> Builder.add_param(:query, :query, params)
       |> Enum.into([])
diff --git a/lib/pleroma/http/request_builder.ex b/lib/pleroma/http/request_builder.ex
index 4e77870bd..6edf15bbe 100644
--- a/lib/pleroma/http/request_builder.ex
+++ b/lib/pleroma/http/request_builder.ex
@@ -53,6 +53,15 @@ defmodule Pleroma.HTTP.RequestBuilder do
         header_list
       end
 
+    # TODO: maybe we need this header for all adapters, so we won't fail on adapter change
+    header_list =
+      if Application.get_env(:tesla, :adapter) == Tesla.Adapter.Gun do
+        %{host: host} = URI.parse(request.url)
+        header_list ++ [{"host", host}]
+      else
+        header_list
+      end
+
     Map.put_new(request, :headers, header_list)
   end
 
diff --git a/test/http/request_builder_test.exs b/test/http/request_builder_test.exs
index ea4dd087e..631730f65 100644
--- a/test/http/request_builder_test.exs
+++ b/test/http/request_builder_test.exs
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.HTTP.RequestBuilderTest do
-  use ExUnit.Case, async: true
+  use ExUnit.Case
   use Pleroma.Tests.Helpers
   alias Pleroma.HTTP.RequestBuilder
 
@@ -21,6 +21,17 @@ defmodule Pleroma.HTTP.RequestBuilderTest do
                headers: [{"user-agent", Pleroma.Application.user_agent()}]
              }
     end
+
+    test "it adds host header for gun adapter" do
+      adapter = Application.get_env(:tesla, :adapter)
+      Application.put_env(:tesla, :adapter, Tesla.Adapter.Gun)
+      on_exit(fn -> Application.put_env(:tesla, :adapter, adapter) end)
+
+      assert RequestBuilder.headers(%{url: "https://example.com"}, []) == %{
+               headers: [{"host", "example.com"}],
+               url: "https://example.com"
+             }
+    end
   end
 
   describe "add_optional_params/3" do