Merge remote-tracking branch 'remotes/origin/develop' into output-of-relationships-in-statuses

# Conflicts:
#	CHANGELOG.md

31 files changed, 1471 insertions, 307 deletions

diff --git a/lib/mix/tasks/pleroma/benchmark.ex b/lib/mix/tasks/pleroma/benchmark.ex
index b2bbe40ac..6ab7fe8ef 100644
--- a/lib/mix/tasks/pleroma/benchmark.ex
+++ b/lib/mix/tasks/pleroma/benchmark.ex
@@ -75,4 +75,43 @@ defmodule Mix.Tasks.Pleroma.Benchmark do
       inputs: inputs
     )
   end
+
+  def run(["adapters"]) do
+    start_pleroma()
+
+    :ok =
+      Pleroma.Gun.Conn.open(
+        "https://httpbin.org/stream-bytes/1500",
+        :gun_connections
+      )
+
+    Process.sleep(1_500)
+
+    Benchee.run(
+      %{
+        "Without conn and without pool" => fn ->
+          {:ok, %Tesla.Env{}} =
+            Pleroma.HTTP.get("https://httpbin.org/stream-bytes/1500", [],
+              adapter: [pool: :no_pool, receive_conn: false]
+            )
+        end,
+        "Without conn and with pool" => fn ->
+          {:ok, %Tesla.Env{}} =
+            Pleroma.HTTP.get("https://httpbin.org/stream-bytes/1500", [],
+              adapter: [receive_conn: false]
+            )
+        end,
+        "With reused conn and without pool" => fn ->
+          {:ok, %Tesla.Env{}} =
+            Pleroma.HTTP.get("https://httpbin.org/stream-bytes/1500", [],
+              adapter: [pool: :no_pool]
+            )
+        end,
+        "With reused conn and with pool" => fn ->
+          {:ok, %Tesla.Env{}} = Pleroma.HTTP.get("https://httpbin.org/stream-bytes/1500")
+        end
+      },
+      parallel: 10
+    )
+  end
 end
diff --git a/lib/mix/tasks/pleroma/emoji.ex b/lib/mix/tasks/pleroma/emoji.ex
index 2b03a3009..429d763c7 100644
--- a/lib/mix/tasks/pleroma/emoji.ex
+++ b/lib/mix/tasks/pleroma/emoji.ex
@@ -4,13 +4,13 @@
 
 defmodule Mix.Tasks.Pleroma.Emoji do
   use Mix.Task
+  import Mix.Pleroma
 
   @shortdoc "Manages emoji packs"
   @moduledoc File.read!("docs/administration/CLI_tasks/emoji.md")
 
   def run(["ls-packs" | args]) do
-    Mix.Pleroma.start_pleroma()
-    Application.ensure_all_started(:hackney)
+    start_pleroma()
 
     {options, [], []} = parse_global_opts(args)
 
@@ -36,8 +36,7 @@ defmodule Mix.Tasks.Pleroma.Emoji do
   end
 
   def run(["get-packs" | args]) do
-    Mix.Pleroma.start_pleroma()
-    Application.ensure_all_started(:hackney)
+    start_pleroma()
 
     {options, pack_names, []} = parse_global_opts(args)
 
@@ -135,7 +134,7 @@ defmodule Mix.Tasks.Pleroma.Emoji do
   end
 
   def run(["gen-pack", src]) do
-    Application.ensure_all_started(:hackney)
+    start_pleroma()
 
     proposed_name = Path.basename(src) |> Path.rootname()
     name = String.trim(IO.gets("Pack name [#{proposed_name}]: "))
diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex
index 51850abb5..a00938c04 100644
--- a/lib/pleroma/application.ex
+++ b/lib/pleroma/application.ex
@@ -3,8 +3,12 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Application do
-  import Cachex.Spec
   use Application
+
+  import Cachex.Spec
+
+  alias Pleroma.Config
+
   require Logger
 
   @name Mix.Project.config()[:name]
@@ -18,9 +22,9 @@ defmodule Pleroma.Application do
   def repository, do: @repository
 
   def user_agent do
-    case Pleroma.Config.get([:http, :user_agent], :default) do
+    case Config.get([:http, :user_agent], :default) do
       :default ->
-        info = "#{Pleroma.Web.base_url()} <#{Pleroma.Config.get([:instance, :email], "")}>"
+        info = "#{Pleroma.Web.base_url()} <#{Config.get([:instance, :email], "")}>"
         named_version() <> "; " <> info
 
       custom ->
@@ -33,27 +37,51 @@ defmodule Pleroma.Application do
   def start(_type, _args) do
     Pleroma.Config.Holder.save_default()
     Pleroma.HTML.compile_scrubbers()
-    Pleroma.Config.DeprecationWarnings.warn()
+    Config.DeprecationWarnings.warn()
     Pleroma.Plugs.HTTPSecurityPlug.warn_if_disabled()
     Pleroma.Repo.check_migrations_applied!()
     setup_instrumenters()
     load_custom_modules()
 
+    adapter = Application.get_env(:tesla, :adapter)
+
+    if adapter == Tesla.Adapter.Gun do
+      if version = Pleroma.OTPVersion.version() do
+        [major, minor] =
+          version
+          |> String.split(".")
+          |> Enum.map(&String.to_integer/1)
+          |> Enum.take(2)
+
+        if (major == 22 and minor < 2) or major < 22 do
+          raise "
+            !!!OTP VERSION WARNING!!!
+            You are using gun adapter with OTP version #{version}, which doesn't support correct handling of unordered certificates chains.
+            "
+        end
+      else
+        raise "
+          !!!OTP VERSION WARNING!!!
+          To support correct handling of unordered certificates chains - OTP version must be > 22.2.
+          "
+      end
+    end
+
     # Define workers and child supervisors to be supervised
     children =
       [
         Pleroma.Repo,
-        Pleroma.Config.TransferTask,
+        Config.TransferTask,
         Pleroma.Emoji,
         Pleroma.Captcha,
         Pleroma.Plugs.RateLimiter.Supervisor
       ] ++
         cachex_children() ++
-        hackney_pool_children() ++
+        http_children(adapter, @env) ++
         [
           Pleroma.Stats,
           Pleroma.JobQueueMonitor,
-          {Oban, Pleroma.Config.get(Oban)}
+          {Oban, Config.get(Oban)}
         ] ++
         task_children(@env) ++
         streamer_child(@env) ++
@@ -70,7 +98,7 @@ defmodule Pleroma.Application do
   end
 
   def load_custom_modules do
-    dir = Pleroma.Config.get([:modules, :runtime_dir])
+    dir = Config.get([:modules, :runtime_dir])
 
     if dir && File.exists?(dir) do
       dir
@@ -111,20 +139,6 @@ defmodule Pleroma.Application do
     Pleroma.Web.Endpoint.Instrumenter.setup()
   end
 
-  def enabled_hackney_pools do
-    [:media] ++
-      if Application.get_env(:tesla, :adapter) == Tesla.Adapter.Hackney do
-        [:federation]
-      else
-        []
-      end ++
-      if Pleroma.Config.get([Pleroma.Upload, :proxy_remote]) do
-        [:upload]
-      else
-        []
-      end
-  end
-
   defp cachex_children do
     [
       build_cachex("used_captcha", ttl_interval: seconds_valid_interval()),
@@ -146,7 +160,7 @@ defmodule Pleroma.Application do
     do: expiration(default: :timer.seconds(6 * 60 * 60), interval: :timer.seconds(60))
 
   defp seconds_valid_interval,
-    do: :timer.seconds(Pleroma.Config.get!([Pleroma.Captcha, :seconds_valid]))
+    do: :timer.seconds(Config.get!([Pleroma.Captcha, :seconds_valid]))
 
   defp build_cachex(type, opts),
     do: %{
@@ -155,7 +169,7 @@ defmodule Pleroma.Application do
       type: :worker
     }
 
-  defp chat_enabled?, do: Pleroma.Config.get([:chat, :enabled])
+  defp chat_enabled?, do: Config.get([:chat, :enabled])
 
   defp streamer_child(env) when env in [:test, :benchmark], do: []
 
@@ -169,13 +183,6 @@ defmodule Pleroma.Application do
 
   defp chat_child(_, _), do: []
 
-  defp hackney_pool_children do
-    for pool <- enabled_hackney_pools() do
-      options = Pleroma.Config.get([:hackney_pools, pool])
-      :hackney_pool.child_spec(pool, options)
-    end
-  end
-
   defp task_children(:test) do
     [
       %{
@@ -200,4 +207,31 @@ defmodule Pleroma.Application do
       }
     ]
   end
+
+  # start hackney and gun pools in tests
+  defp http_children(_, :test) do
+    hackney_options = Config.get([:hackney_pools, :federation])
+    hackney_pool = :hackney_pool.child_spec(:federation, hackney_options)
+    [hackney_pool, Pleroma.Pool.Supervisor]
+  end
+
+  defp http_children(Tesla.Adapter.Hackney, _) do
+    pools = [:federation, :media]
+
+    pools =
+      if Config.get([Pleroma.Upload, :proxy_remote]) do
+        [:upload | pools]
+      else
+        pools
+      end
+
+    for pool <- pools do
+      options = Config.get([:hackney_pools, pool])
+      :hackney_pool.child_spec(pool, options)
+    end
+  end
+
+  defp http_children(Tesla.Adapter.Gun, _), do: [Pleroma.Pool.Supervisor]
+
+  defp http_children(_, _), do: []
 end
diff --git a/lib/pleroma/config/config_db.ex b/lib/pleroma/config/config_db.ex
index 2b43d4c36..4097ee5b7 100644
--- a/lib/pleroma/config/config_db.ex
+++ b/lib/pleroma/config/config_db.ex
@@ -278,8 +278,6 @@ defmodule Pleroma.ConfigDB do
     }
   end
 
-  defp do_convert({:partial_chain, entity}), do: %{"tuple" => [":partial_chain", inspect(entity)]}
-
   defp do_convert(entity) when is_tuple(entity) do
     value =
       entity
@@ -323,15 +321,6 @@ defmodule Pleroma.ConfigDB do
     {:proxy_url, {do_transform_string(type), parse_host(host), port}}
   end
 
-  defp do_transform(%{"tuple" => [":partial_chain", entity]}) do
-    {partial_chain, []} =
-      entity
-      |> String.replace(~r/[^\w|^{:,[|^,|^[|^\]^}|^\/|^\.|^"]^\s/, "")
-      |> Code.eval_string()
-
-    {:partial_chain, partial_chain}
-  end
-
   defp do_transform(%{"tuple" => entity}) do
     Enum.reduce(entity, {}, fn val, acc -> Tuple.append(acc, do_transform(val)) end)
   end
diff --git a/lib/pleroma/config/transfer_task.ex b/lib/pleroma/config/transfer_task.ex
index 7c3449b5e..936bc9ab1 100644
--- a/lib/pleroma/config/transfer_task.ex
+++ b/lib/pleroma/config/transfer_task.ex
@@ -5,6 +5,7 @@
 defmodule Pleroma.Config.TransferTask do
   use Task
 
+  alias Pleroma.Config
   alias Pleroma.ConfigDB
   alias Pleroma.Repo
 
@@ -18,7 +19,9 @@ defmodule Pleroma.Config.TransferTask do
     {:pleroma, Oban},
     {:pleroma, :rate_limit},
     {:pleroma, :markup},
-    {:plerome, :streamer}
+    {:pleroma, :streamer},
+    {:pleroma, :pools},
+    {:pleroma, :connections_pool}
   ]
 
   @reboot_time_subkeys [
@@ -32,45 +35,33 @@ defmodule Pleroma.Config.TransferTask do
     {:pleroma, :gopher, [:enabled]}
   ]
 
-  @reject [nil, :prometheus]
-
   def start_link(_) do
     load_and_update_env()
-    if Pleroma.Config.get(:env) == :test, do: Ecto.Adapters.SQL.Sandbox.checkin(Repo)
+    if Config.get(:env) == :test, do: Ecto.Adapters.SQL.Sandbox.checkin(Repo)
     :ignore
   end
 
-  @spec load_and_update_env([ConfigDB.t()]) :: :ok | false
-  def load_and_update_env(deleted \\ [], restart_pleroma? \\ true) do
-    with {:configurable, true} <-
-           {:configurable, Pleroma.Config.get(:configurable_from_database)},
-         true <- Ecto.Adapters.SQL.table_exists?(Repo, "config"),
-         started_applications <- Application.started_applications() do
+  @spec load_and_update_env([ConfigDB.t()], boolean()) :: :ok
+  def load_and_update_env(deleted_settings \\ [], restart_pleroma? \\ true) do
+    with {_, true} <- {:configurable, Config.get(:configurable_from_database)} do
       # We need to restart applications for loaded settings take effect
 
-      in_db = Repo.all(ConfigDB)
-
-      with_deleted = in_db ++ deleted
-
-      reject_for_restart = if restart_pleroma?, do: @reject, else: [:pleroma | @reject]
-
-      applications =
-        with_deleted
-        |> Enum.map(&merge_and_update(&1))
-        |> Enum.uniq()
-        # TODO: some problem with prometheus after restart!
-        |> Enum.reject(&(&1 in reject_for_restart))
-
-      # to be ensured that pleroma will be restarted last
-      applications =
-        if :pleroma in applications do
-          List.delete(applications, :pleroma) ++ [:pleroma]
+      # TODO: some problem with prometheus after restart!
+      reject_restart =
+        if restart_pleroma? do
+          [nil, :prometheus]
         else
-          Restarter.Pleroma.rebooted()
-          applications
+          [:pleroma, nil, :prometheus]
         end
 
-      Enum.each(applications, &restart(started_applications, &1, Pleroma.Config.get(:env)))
+      started_applications = Application.started_applications()
+
+      (Repo.all(ConfigDB) ++ deleted_settings)
+      |> Enum.map(&merge_and_update/1)
+      |> Enum.uniq()
+      |> Enum.reject(&(&1 in reject_restart))
+      |> maybe_set_pleroma_last()
+      |> Enum.each(&restart(started_applications, &1, Config.get(:env)))
 
       :ok
     else
@@ -78,42 +69,54 @@ defmodule Pleroma.Config.TransferTask do
     end
   end
 
+  defp maybe_set_pleroma_last(apps) do
+    # to be ensured that pleroma will be restarted last
+    if :pleroma in apps do
+      apps
+      |> List.delete(:pleroma)
+      |> List.insert_at(-1, :pleroma)
+    else
+      Restarter.Pleroma.rebooted()
+      apps
+    end
+  end
+
+  defp group_for_restart(:logger, key, _, merged_value) do
+    # change logger configuration in runtime, without restart
+    if Keyword.keyword?(merged_value) and
+         key not in [:compile_time_application, :backends, :compile_time_purge_matching] do
+      Logger.configure_backend(key, merged_value)
+    else
+      Logger.configure([{key, merged_value}])
+    end
+
+    nil
+  end
+
+  defp group_for_restart(group, _, _, _) when group != :pleroma, do: group
+
+  defp group_for_restart(group, key, value, _) do
+    if pleroma_need_restart?(group, key, value), do: group
+  end
+
   defp merge_and_update(setting) do
     try do
       key = ConfigDB.from_string(setting.key)
       group = ConfigDB.from_string(setting.group)
 
-      default = Pleroma.Config.Holder.default_config(group, key)
+      default = Config.Holder.default_config(group, key)
       value = ConfigDB.from_binary(setting.value)
 
       merged_value =
-        if Ecto.get_meta(setting, :state) == :deleted do
-          default
-        else
-          if can_be_merged?(default, value) do
-            ConfigDB.merge_group(group, key, default, value)
-          else
-            value
-          end
+        cond do
+          Ecto.get_meta(setting, :state) == :deleted -> default
+          can_be_merged?(default, value) -> ConfigDB.merge_group(group, key, default, value)
+          true -> value
         end
 
       :ok = update_env(group, key, merged_value)
 
-      if group != :logger do
-        if group != :pleroma or pleroma_need_restart?(group, key, value) do
-          group
-        end
-      else
-        # change logger configuration in runtime, without restart
-        if Keyword.keyword?(merged_value) and
-             key not in [:compile_time_application, :backends, :compile_time_purge_matching] do
-          Logger.configure_backend(key, merged_value)
-        else
-          Logger.configure([{key, merged_value}])
-        end
-
-        nil
-      end
+      group_for_restart(group, key, value, merged_value)
     rescue
       error ->
         error_msg =
diff --git a/lib/pleroma/gun/api.ex b/lib/pleroma/gun/api.ex
new file mode 100644
index 000000000..f51cd7db8
--- /dev/null
+++ b/lib/pleroma/gun/api.ex
@@ -0,0 +1,45 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Gun.API do
+  @behaviour Pleroma.Gun
+
+  alias Pleroma.Gun
+
+  @gun_keys [
+    :connect_timeout,
+    :http_opts,
+    :http2_opts,
+    :protocols,
+    :retry,
+    :retry_timeout,
+    :trace,
+    :transport,
+    :tls_opts,
+    :tcp_opts,
+    :socks_opts,
+    :ws_opts
+  ]
+
+  @impl Gun
+  def open(host, port, opts \\ %{}), do: :gun.open(host, port, Map.take(opts, @gun_keys))
+
+  @impl Gun
+  defdelegate info(pid), to: :gun
+
+  @impl Gun
+  defdelegate close(pid), to: :gun
+
+  @impl Gun
+  defdelegate await_up(pid, timeout \\ 5_000), to: :gun
+
+  @impl Gun
+  defdelegate connect(pid, opts), to: :gun
+
+  @impl Gun
+  defdelegate await(pid, ref), to: :gun
+
+  @impl Gun
+  defdelegate set_owner(pid, owner), to: :gun
+end
diff --git a/lib/pleroma/gun/conn.ex b/lib/pleroma/gun/conn.ex
new file mode 100644
index 000000000..20823a765
--- /dev/null
+++ b/lib/pleroma/gun/conn.ex
@@ -0,0 +1,196 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Gun.Conn do
+  @moduledoc """
+  Struct for gun connection data
+  """
+  alias Pleroma.Gun
+  alias Pleroma.Pool.Connections
+
+  require Logger
+
+  @type gun_state :: :up | :down
+  @type conn_state :: :active | :idle
+
+  @type t :: %__MODULE__{
+          conn: pid(),
+          gun_state: gun_state(),
+          conn_state: conn_state(),
+          used_by: [pid()],
+          last_reference: pos_integer(),
+          crf: float(),
+          retries: pos_integer()
+        }
+
+  defstruct conn: nil,
+            gun_state: :open,
+            conn_state: :init,
+            used_by: [],
+            last_reference: 0,
+            crf: 1,
+            retries: 0
+
+  @spec open(String.t() | URI.t(), atom(), keyword()) :: :ok | nil
+  def open(url, name, opts \\ [])
+  def open(url, name, opts) when is_binary(url), do: open(URI.parse(url), name, opts)
+
+  def open(%URI{} = uri, name, opts) do
+    pool_opts = Pleroma.Config.get([:connections_pool], [])
+
+    opts =
+      opts
+      |> Enum.into(%{})
+      |> Map.put_new(:retry, pool_opts[:retry] || 1)
+      |> Map.put_new(:retry_timeout, pool_opts[:retry_timeout] || 1000)
+      |> Map.put_new(:await_up_timeout, pool_opts[:await_up_timeout] || 5_000)
+      |> maybe_add_tls_opts(uri)
+
+    key = "#{uri.scheme}:#{uri.host}:#{uri.port}"
+
+    conn_pid =
+      if Connections.count(name) < opts[:max_connection] do
+        do_open(uri, opts)
+      else
+        close_least_used_and_do_open(name, uri, opts)
+      end
+
+    if is_pid(conn_pid) do
+      conn = %Pleroma.Gun.Conn{
+        conn: conn_pid,
+        gun_state: :up,
+        conn_state: :active,
+        last_reference: :os.system_time(:second)
+      }
+
+      :ok = Gun.set_owner(conn_pid, Process.whereis(name))
+      Connections.add_conn(name, key, conn)
+    end
+  end
+
+  defp maybe_add_tls_opts(opts, %URI{scheme: "http"}), do: opts
+
+  defp maybe_add_tls_opts(opts, %URI{scheme: "https", host: host}) do
+    tls_opts = [
+      verify: :verify_peer,
+      cacertfile: CAStore.file_path(),
+      depth: 20,
+      reuse_sessions: false,
+      verify_fun:
+        {&:ssl_verify_hostname.verify_fun/3,
+         [check_hostname: Pleroma.HTTP.Connection.format_host(host)]}
+    ]
+
+    tls_opts =
+      if Keyword.keyword?(opts[:tls_opts]) do
+        Keyword.merge(tls_opts, opts[:tls_opts])
+      else
+        tls_opts
+      end
+
+    Map.put(opts, :tls_opts, tls_opts)
+  end
+
+  defp do_open(uri, %{proxy: {proxy_host, proxy_port}} = opts) do
+    connect_opts =
+      uri
+      |> destination_opts()
+      |> add_http2_opts(uri.scheme, Map.get(opts, :tls_opts, []))
+
+    with open_opts <- Map.delete(opts, :tls_opts),
+         {:ok, conn} <- Gun.open(proxy_host, proxy_port, open_opts),
+         {:ok, _} <- Gun.await_up(conn, opts[:await_up_timeout]),
+         stream <- Gun.connect(conn, connect_opts),
+         {:response, :fin, 200, _} <- Gun.await(conn, stream) do
+      conn
+    else
+      error ->
+        Logger.warn(
+          "Opening proxied connection to #{compose_uri_log(uri)} failed with error #{
+            inspect(error)
+          }"
+        )
+
+        error
+    end
+  end
+
+  defp do_open(uri, %{proxy: {proxy_type, proxy_host, proxy_port}} = opts) do
+    version =
+      proxy_type
+      |> to_string()
+      |> String.last()
+      |> case do
+        "4" -> 4
+        _ -> 5
+      end
+
+    socks_opts =
+      uri
+      |> destination_opts()
+      |> add_http2_opts(uri.scheme, Map.get(opts, :tls_opts, []))
+      |> Map.put(:version, version)
+
+    opts =
+      opts
+      |> Map.put(:protocols, [:socks])
+      |> Map.put(:socks_opts, socks_opts)
+
+    with {:ok, conn} <- Gun.open(proxy_host, proxy_port, opts),
+         {:ok, _} <- Gun.await_up(conn, opts[:await_up_timeout]) do
+      conn
+    else
+      error ->
+        Logger.warn(
+          "Opening socks proxied connection to #{compose_uri_log(uri)} failed with error #{
+            inspect(error)
+          }"
+        )
+
+        error
+    end
+  end
+
+  defp do_open(%URI{host: host, port: port} = uri, opts) do
+    host = Pleroma.HTTP.Connection.parse_host(host)
+
+    with {:ok, conn} <- Gun.open(host, port, opts),
+         {:ok, _} <- Gun.await_up(conn, opts[:await_up_timeout]) do
+      conn
+    else
+      error ->
+        Logger.warn(
+          "Opening connection to #{compose_uri_log(uri)} failed with error #{inspect(error)}"
+        )
+
+        error
+    end
+  end
+
+  defp destination_opts(%URI{host: host, port: port}) do
+    host = Pleroma.HTTP.Connection.parse_host(host)
+    %{host: host, port: port}
+  end
+
+  defp add_http2_opts(opts, "https", tls_opts) do
+    Map.merge(opts, %{protocols: [:http2], transport: :tls, tls_opts: tls_opts})
+  end
+
+  defp add_http2_opts(opts, _, _), do: opts
+
+  defp close_least_used_and_do_open(name, uri, opts) do
+    with [{key, conn} | _conns] <- Connections.get_unused_conns(name),
+         :ok <- Gun.close(conn.conn) do
+      Connections.remove_conn(name, key)
+
+      do_open(uri, opts)
+    else
+      [] -> {:error, :pool_overflowed}
+    end
+  end
+
+  def compose_uri_log(%URI{scheme: scheme, host: host, path: path}) do
+    "#{scheme}://#{host}#{path}"
+  end
+end
diff --git a/lib/pleroma/gun/gun.ex b/lib/pleroma/gun/gun.ex
new file mode 100644
index 000000000..4043e4880
--- /dev/null
+++ b/lib/pleroma/gun/gun.ex
@@ -0,0 +1,31 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Gun do
+  @callback open(charlist(), pos_integer(), map()) :: {:ok, pid()}
+  @callback info(pid()) :: map()
+  @callback close(pid()) :: :ok
+  @callback await_up(pid, pos_integer()) :: {:ok, atom()} | {:error, atom()}
+  @callback connect(pid(), map()) :: reference()
+  @callback await(pid(), reference()) :: {:response, :fin, 200, []}
+  @callback set_owner(pid(), pid()) :: :ok
+
+  @api Pleroma.Config.get([Pleroma.Gun], Pleroma.Gun.API)
+
+  defp api, do: @api
+
+  def open(host, port, opts), do: api().open(host, port, opts)
+
+  def info(pid), do: api().info(pid)
+
+  def close(pid), do: api().close(pid)
+
+  def await_up(pid, timeout \\ 5_000), do: api().await_up(pid, timeout)
+
+  def connect(pid, opts), do: api().connect(pid, opts)
+
+  def await(pid, ref), do: api().await(pid, ref)
+
+  def set_owner(pid, owner), do: api().set_owner(pid, owner)
+end
diff --git a/lib/pleroma/http/adapter_helper.ex b/lib/pleroma/http/adapter_helper.ex
new file mode 100644
index 000000000..510722ff9
--- /dev/null
+++ b/lib/pleroma/http/adapter_helper.ex
@@ -0,0 +1,41 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.HTTP.AdapterHelper do
+  alias Pleroma.HTTP.Connection
+
+  @type proxy ::
+          {Connection.host(), pos_integer()}
+          | {Connection.proxy_type(), Connection.host(), pos_integer()}
+
+  @callback options(keyword(), URI.t()) :: keyword()
+  @callback after_request(keyword()) :: :ok
+
+  @spec options(keyword(), URI.t()) :: keyword()
+  def options(opts, _uri) do
+    proxy = Pleroma.Config.get([:http, :proxy_url], nil)
+    maybe_add_proxy(opts, format_proxy(proxy))
+  end
+
+  @spec maybe_get_conn(URI.t(), keyword()) :: keyword()
+  def maybe_get_conn(_uri, opts), do: opts
+
+  @spec after_request(keyword()) :: :ok
+  def after_request(_opts), do: :ok
+
+  @spec format_proxy(String.t() | tuple() | nil) :: proxy() | nil
+  def format_proxy(nil), do: nil
+
+  def format_proxy(proxy_url) do
+    case Connection.parse_proxy(proxy_url) do
+      {:ok, host, port} -> {host, port}
+      {:ok, type, host, port} -> {type, host, port}
+      _ -> nil
+    end
+  end
+
+  @spec maybe_add_proxy(keyword(), proxy() | nil) :: keyword()
+  def maybe_add_proxy(opts, nil), do: opts
+  def maybe_add_proxy(opts, proxy), do: Keyword.put_new(opts, :proxy, proxy)
+end
diff --git a/lib/pleroma/http/adapter_helper/gun.ex b/lib/pleroma/http/adapter_helper/gun.ex
new file mode 100644
index 000000000..ead7cdc6b
--- /dev/null
+++ b/lib/pleroma/http/adapter_helper/gun.ex
@@ -0,0 +1,77 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.HTTP.AdapterHelper.Gun do
+  @behaviour Pleroma.HTTP.AdapterHelper
+
+  alias Pleroma.HTTP.AdapterHelper
+  alias Pleroma.Pool.Connections
+
+  require Logger
+
+  @defaults [
+    connect_timeout: 5_000,
+    domain_lookup_timeout: 5_000,
+    tls_handshake_timeout: 5_000,
+    retry: 1,
+    retry_timeout: 1000,
+    await_up_timeout: 5_000
+  ]
+
+  @spec options(keyword(), URI.t()) :: keyword()
+  def options(incoming_opts \\ [], %URI{} = uri) do
+    proxy =
+      Pleroma.Config.get([:http, :proxy_url])
+      |> AdapterHelper.format_proxy()
+
+    config_opts = Pleroma.Config.get([:http, :adapter], [])
+
+    @defaults
+    |> Keyword.merge(config_opts)
+    |> add_scheme_opts(uri)
+    |> AdapterHelper.maybe_add_proxy(proxy)
+    |> maybe_get_conn(uri, incoming_opts)
+  end
+
+  @spec after_request(keyword()) :: :ok
+  def after_request(opts) do
+    if opts[:conn] && opts[:body_as] != :chunks do
+      Connections.checkout(opts[:conn], self(), :gun_connections)
+    end
+
+    :ok
+  end
+
+  defp add_scheme_opts(opts, %{scheme: "http"}), do: opts
+
+  defp add_scheme_opts(opts, %{scheme: "https"}) do
+    opts
+    |> Keyword.put(:certificates_verification, true)
+    |> Keyword.put(:tls_opts, log_level: :warning)
+  end
+
+  defp maybe_get_conn(adapter_opts, uri, incoming_opts) do
+    {receive_conn?, opts} =
+      adapter_opts
+      |> Keyword.merge(incoming_opts)
+      |> Keyword.pop(:receive_conn, true)
+
+    if Connections.alive?(:gun_connections) and receive_conn? do
+      checkin_conn(uri, opts)
+    else
+      opts
+    end
+  end
+
+  defp checkin_conn(uri, opts) do
+    case Connections.checkin(uri, :gun_connections) do
+      nil ->
+        Task.start(Pleroma.Gun.Conn, :open, [uri, :gun_connections, opts])
+        opts
+
+      conn when is_pid(conn) ->
+        Keyword.merge(opts, conn: conn, close_conn: false)
+    end
+  end
+end
diff --git a/lib/pleroma/http/adapter_helper/hackney.ex b/lib/pleroma/http/adapter_helper/hackney.ex
new file mode 100644
index 000000000..dcb4cac71
--- /dev/null
+++ b/lib/pleroma/http/adapter_helper/hackney.ex
@@ -0,0 +1,43 @@
+defmodule Pleroma.HTTP.AdapterHelper.Hackney do
+  @behaviour Pleroma.HTTP.AdapterHelper
+
+  @defaults [
+    connect_timeout: 10_000,
+    recv_timeout: 20_000,
+    follow_redirect: true,
+    force_redirect: true,
+    pool: :federation
+  ]
+
+  @spec options(keyword(), URI.t()) :: keyword()
+  def options(connection_opts \\ [], %URI{} = uri) do
+    proxy = Pleroma.Config.get([:http, :proxy_url])
+
+    config_opts = Pleroma.Config.get([:http, :adapter], [])
+
+    @defaults
+    |> Keyword.merge(config_opts)
+    |> Keyword.merge(connection_opts)
+    |> add_scheme_opts(uri)
+    |> Pleroma.HTTP.AdapterHelper.maybe_add_proxy(proxy)
+  end
+
+  defp add_scheme_opts(opts, %URI{scheme: "http"}), do: opts
+
+  defp add_scheme_opts(opts, %URI{scheme: "https", host: host}) do
+    ssl_opts = [
+      ssl_options: [
+        # Workaround for remote server certificate chain issues
+        partial_chain: &:hackney_connect.partial_chain/1,
+
+        # We don't support TLS v1.3 yet
+        versions: [:tlsv1, :"tlsv1.1", :"tlsv1.2"],
+        server_name_indication: to_charlist(host)
+      ]
+    ]
+
+    Keyword.merge(opts, ssl_opts)
+  end
+
+  def after_request(_), do: :ok
+end
diff --git a/lib/pleroma/http/connection.ex b/lib/pleroma/http/connection.ex
index 80e6c30d6..ebacf7902 100644
--- a/lib/pleroma/http/connection.ex
+++ b/lib/pleroma/http/connection.ex
@@ -4,40 +4,121 @@
 
 defmodule Pleroma.HTTP.Connection do
   @moduledoc """
-  Connection for http-requests.
+  Configure Tesla.Client with default and customized adapter options.
   """
 
-  @hackney_options [
-    connect_timeout: 10_000,
-    recv_timeout: 20_000,
-    follow_redirect: true,
-    force_redirect: true,
-    pool: :federation
-  ]
-  @adapter Application.get_env(:tesla, :adapter)
+  alias Pleroma.Config
+  alias Pleroma.HTTP.AdapterHelper
 
-  @doc """
-  Configure a client connection
+  require Logger
+
+  @defaults [pool: :federation]
 
-  # Returns
+  @type ip_address :: ipv4_address() | ipv6_address()
+  @type ipv4_address :: {0..255, 0..255, 0..255, 0..255}
+  @type ipv6_address ::
+          {0..65_535, 0..65_535, 0..65_535, 0..65_535, 0..65_535, 0..65_535, 0..65_535, 0..65_535}
+  @type proxy_type() :: :socks4 | :socks5
+  @type host() :: charlist() | ip_address()
 
-  Tesla.Env.client
+  @doc """
+  Merge default connection & adapter options with received ones.
   """
-  @spec new(Keyword.t()) :: Tesla.Env.client()
-  def new(opts \\ []) do
-    Tesla.client([], {@adapter, hackney_options(opts)})
+
+  @spec options(URI.t(), keyword()) :: keyword()
+  def options(%URI{} = uri, opts \\ []) do
+    @defaults
+    |> pool_timeout()
+    |> Keyword.merge(opts)
+    |> adapter_helper().options(uri)
+  end
+
+  defp pool_timeout(opts) do
+    {config_key, default} =
+      if adapter() == Tesla.Adapter.Gun do
+        {:pools, Config.get([:pools, :default, :timeout])}
+      else
+        {:hackney_pools, 10_000}
+      end
+
+    timeout = Config.get([config_key, opts[:pool], :timeout], default)
+
+    Keyword.merge(opts, timeout: timeout)
+  end
+
+  @spec after_request(keyword()) :: :ok
+  def after_request(opts), do: adapter_helper().after_request(opts)
+
+  defp adapter, do: Application.get_env(:tesla, :adapter)
+
+  defp adapter_helper do
+    case adapter() do
+      Tesla.Adapter.Gun -> AdapterHelper.Gun
+      Tesla.Adapter.Hackney -> AdapterHelper.Hackney
+      _ -> AdapterHelper
+    end
+  end
+
+  @spec parse_proxy(String.t() | tuple() | nil) ::
+          {:ok, host(), pos_integer()}
+          | {:ok, proxy_type(), host(), pos_integer()}
+          | {:error, atom()}
+          | nil
+
+  def parse_proxy(nil), do: nil
+
+  def parse_proxy(proxy) when is_binary(proxy) do
+    with [host, port] <- String.split(proxy, ":"),
+         {port, ""} <- Integer.parse(port) do
+      {:ok, parse_host(host), port}
+    else
+      {_, _} ->
+        Logger.warn("Parsing port failed #{inspect(proxy)}")
+        {:error, :invalid_proxy_port}
+
+      :error ->
+        Logger.warn("Parsing port failed #{inspect(proxy)}")
+        {:error, :invalid_proxy_port}
+
+      _ ->
+        Logger.warn("Parsing proxy failed #{inspect(proxy)}")
+        {:error, :invalid_proxy}
+    end
+  end
+
+  def parse_proxy(proxy) when is_tuple(proxy) do
+    with {type, host, port} <- proxy do
+      {:ok, type, parse_host(host), port}
+    else
+      _ ->
+        Logger.warn("Parsing proxy failed #{inspect(proxy)}")
+        {:error, :invalid_proxy}
+    end
   end
 
-  # fetch Hackney options
-  #
-  def hackney_options(opts) do
-    options = Keyword.get(opts, :adapter, [])
-    adapter_options = Pleroma.Config.get([:http, :adapter], [])
-    proxy_url = Pleroma.Config.get([:http, :proxy_url], nil)
-
-    @hackney_options
-    |> Keyword.merge(adapter_options)
-    |> Keyword.merge(options)
-    |> Keyword.merge(proxy: proxy_url)
+  @spec parse_host(String.t() | atom() | charlist()) :: charlist() | ip_address()
+  def parse_host(host) when is_list(host), do: host
+  def parse_host(host) when is_atom(host), do: to_charlist(host)
+
+  def parse_host(host) when is_binary(host) do
+    host = to_charlist(host)
+
+    case :inet.parse_address(host) do
+      {:error, :einval} -> host
+      {:ok, ip} -> ip
+    end
+  end
+
+  @spec format_host(String.t()) :: charlist()
+  def format_host(host) do
+    host_charlist = to_charlist(host)
+
+    case :inet.parse_address(host_charlist) do
+      {:error, :einval} ->
+        :idna.encode(host_charlist)
+
+      {:ok, _ip} ->
+        host_charlist
+    end
   end
 end
diff --git a/lib/pleroma/http/http.ex b/lib/pleroma/http/http.ex
index ee5b5e127..583b56484 100644
--- a/lib/pleroma/http/http.ex
+++ b/lib/pleroma/http/http.ex
@@ -4,21 +4,47 @@
 
 defmodule Pleroma.HTTP do
   @moduledoc """
-
+    Wrapper for `Tesla.request/2`.
   """
 
   alias Pleroma.HTTP.Connection
+  alias Pleroma.HTTP.Request
   alias Pleroma.HTTP.RequestBuilder, as: Builder
+  alias Tesla.Client
+  alias Tesla.Env
+
+  require Logger
 
   @type t :: __MODULE__
 
   @doc """
-  Builds and perform http request.
+  Performs GET request.
+
+  See `Pleroma.HTTP.request/5`
+  """
+  @spec get(Request.url() | nil, Request.headers(), keyword()) ::
+          nil | {:ok, Env.t()} | {:error, any()}
+  def get(url, headers \\ [], options \\ [])
+  def get(nil, _, _), do: nil
+  def get(url, headers, options), do: request(:get, url, "", headers, options)
+
+  @doc """
+  Performs POST request.
+
+  See `Pleroma.HTTP.request/5`
+  """
+  @spec post(Request.url(), String.t(), Request.headers(), keyword()) ::
+          {:ok, Env.t()} | {:error, any()}
+  def post(url, body, headers \\ [], options \\ []),
+    do: request(:post, url, body, headers, options)
+
+  @doc """
+  Builds and performs http request.
 
   # Arguments:
   `method` - :get, :post, :put, :delete
-  `url`
-  `body`
+  `url` - full url
+  `body` - request body
   `headers` - a keyworld list of headers, e.g. `[{"content-type", "text/plain"}]`
   `options` - custom, per-request middleware or adapter options
 
@@ -26,61 +52,66 @@ defmodule Pleroma.HTTP do
   `{:ok, %Tesla.Env{}}` or `{:error, error}`
 
   """
-  def request(method, url, body \\ "", headers \\ [], options \\ []) do
-    try do
-      options =
-        process_request_options(options)
-        |> process_sni_options(url)
-
-      params = Keyword.get(options, :params, [])
-
-      %{}
-      |> Builder.method(method)
-      |> Builder.headers(headers)
-      |> Builder.opts(options)
-      |> Builder.url(url)
-      |> Builder.add_param(:body, :body, body)
-      |> Builder.add_param(:query, :query, params)
-      |> Enum.into([])
-      |> (&Tesla.request(Connection.new(options), &1)).()
-    rescue
-      e ->
-        {:error, e}
-    catch
-      :exit, e ->
-        {:error, e}
-    end
-  end
+  @spec request(atom(), Request.url(), String.t(), Request.headers(), keyword()) ::
+          {:ok, Env.t()} | {:error, any()}
+  def request(method, url, body, headers, options) when is_binary(url) do
+    uri = URI.parse(url)
+    adapter_opts = Connection.options(uri, options[:adapter] || [])
+    options = put_in(options[:adapter], adapter_opts)
+    params = options[:params] || []
+    request = build_request(method, headers, options, url, body, params)
 
-  defp process_sni_options(options, nil), do: options
+    adapter = Application.get_env(:tesla, :adapter)
+    client = Tesla.client([Tesla.Middleware.FollowRedirects], adapter)
 
-  defp process_sni_options(options, url) do
-    uri = URI.parse(url)
-    host = uri.host |> to_charlist()
+    pid = Process.whereis(adapter_opts[:pool])
 
-    case uri.scheme do
-      "https" -> options ++ [ssl: [server_name_indication: host]]
-      _ -> options
-    end
-  end
+    pool_alive? =
+      if adapter == Tesla.Adapter.Gun && pid do
+        Process.alive?(pid)
+      else
+        false
+      end
+
+    request_opts =
+      adapter_opts
+      |> Enum.into(%{})
+      |> Map.put(:env, Pleroma.Config.get([:env]))
+      |> Map.put(:pool_alive?, pool_alive?)
+
+    response = request(client, request, request_opts)
+
+    Connection.after_request(adapter_opts)
 
-  def process_request_options(options) do
-    Keyword.merge(Pleroma.HTTP.Connection.hackney_options([]), options)
+    response
   end
 
-  @doc """
-  Performs GET request.
+  @spec request(Client.t(), keyword(), map()) :: {:ok, Env.t()} | {:error, any()}
+  def request(%Client{} = client, request, %{env: :test}), do: request(client, request)
 
-  See `Pleroma.HTTP.request/5`
-  """
-  def get(url, headers \\ [], options \\ []),
-    do: request(:get, url, "", headers, options)
+  def request(%Client{} = client, request, %{body_as: :chunks}), do: request(client, request)
 
-  @doc """
-  Performs POST request.
+  def request(%Client{} = client, request, %{pool_alive?: false}), do: request(client, request)
 
-  See `Pleroma.HTTP.request/5`
-  """
-  def post(url, body, headers \\ [], options \\ []),
-    do: request(:post, url, body, headers, options)
+  def request(%Client{} = client, request, %{pool: pool, timeout: timeout}) do
+    :poolboy.transaction(
+      pool,
+      &Pleroma.Pool.Request.execute(&1, client, request, timeout),
+      timeout
+    )
+  end
+
+  @spec request(Client.t(), keyword()) :: {:ok, Env.t()} | {:error, any()}
+  def request(client, request), do: Tesla.request(client, request)
+
+  defp build_request(method, headers, options, url, body, params) do
+    Builder.new()
+    |> Builder.method(method)
+    |> Builder.headers(headers)
+    |> Builder.opts(options)
+    |> Builder.url(url)
+    |> Builder.add_param(:body, :body, body)
+    |> Builder.add_param(:query, :query, params)
+    |> Builder.convert_to_keyword()
+  end
 end
diff --git a/lib/pleroma/http/request.ex b/lib/pleroma/http/request.ex
new file mode 100644
index 000000000..761bd6ccf
--- /dev/null
+++ b/lib/pleroma/http/request.ex
@@ -0,0 +1,23 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.HTTP.Request do
+  @moduledoc """
+  Request struct.
+  """
+  defstruct method: :get, url: "", query: [], headers: [], body: "", opts: []
+
+  @type method :: :head | :get | :delete | :trace | :options | :post | :put | :patch
+  @type url :: String.t()
+  @type headers :: [{String.t(), String.t()}]
+
+  @type t :: %__MODULE__{
+          method: method(),
+          url: url(),
+          query: keyword(),
+          headers: headers(),
+          body: String.t(),
+          opts: keyword()
+        }
+end
diff --git a/lib/pleroma/http/request_builder.ex b/lib/pleroma/http/request_builder.ex
index 77ef4bfd8..2fc876d92 100644
--- a/lib/pleroma/http/request_builder.ex
+++ b/lib/pleroma/http/request_builder.ex
@@ -7,136 +7,87 @@ defmodule Pleroma.HTTP.RequestBuilder do
   Helper functions for building Tesla requests
   """
 
-  @doc """
-  Specify the request method when building a request
-
-  ## Parameters
-
-  - request (Map) - Collected request options
-  - m (atom) - Request method
-
-  ## Returns
+  alias Pleroma.HTTP.Request
+  alias Tesla.Multipart
 
-  Map
+  @doc """
+  Creates new request
   """
-  @spec method(map(), atom) :: map()
-  def method(request, m) do
-    Map.put_new(request, :method, m)
-  end
+  @spec new(Request.t()) :: Request.t()
+  def new(%Request{} = request \\ %Request{}), do: request
 
   @doc """
   Specify the request method when building a request
+  """
+  @spec method(Request.t(), Request.method()) :: Request.t()
+  def method(request, m), do: %{request | method: m}
 
-  ## Parameters
-
-  - request (Map) - Collected request options
-  - u (String) - Request URL
-
-  ## Returns
-
-  Map
+  @doc """
+  Specify the request method when building a request
   """
-  @spec url(map(), String.t()) :: map()
-  def url(request, u) do
-    Map.put_new(request, :url, u)
-  end
+  @spec url(Request.t(), Request.url()) :: Request.t()
+  def url(request, u), do: %{request | url: u}
 
   @doc """
   Add headers to the request
   """
-  @spec headers(map(), list(tuple)) :: map()
-  def headers(request, header_list) do
-    header_list =
+  @spec headers(Request.t(), Request.headers()) :: Request.t()
+  def headers(request, headers) do
+    headers_list =
       if Pleroma.Config.get([:http, :send_user_agent]) do
-        header_list ++ [{"User-Agent", Pleroma.Application.user_agent()}]
+        [{"user-agent", Pleroma.Application.user_agent()} | headers]
       else
-        header_list
+        headers
       end
 
-    Map.put_new(request, :headers, header_list)
+    %{request | headers: headers_list}
   end
 
   @doc """
   Add custom, per-request middleware or adapter options to the request
   """
-  @spec opts(map(), Keyword.t()) :: map()
-  def opts(request, options) do
-    Map.put_new(request, :opts, options)
-  end
-
-  @doc """
-  Add optional parameters to the request
-
-  ## Parameters
-
-  - request (Map) - Collected request options
-  - definitions (Map) - Map of parameter name to parameter location.
-  - options (KeywordList) - The provided optional parameters
-
-  ## Returns
-
-  Map
-  """
-  @spec add_optional_params(map(), %{optional(atom) => atom}, keyword()) :: map()
-  def add_optional_params(request, _, []), do: request
-
-  def add_optional_params(request, definitions, [{key, value} | tail]) do
-    case definitions do
-      %{^key => location} ->
-        request
-        |> add_param(location, key, value)
-        |> add_optional_params(definitions, tail)
-
-      _ ->
-        add_optional_params(request, definitions, tail)
-    end
-  end
+  @spec opts(Request.t(), keyword()) :: Request.t()
+  def opts(request, options), do: %{request | opts: options}
 
   @doc """
   Add optional parameters to the request
-
-  ## Parameters
-
-  - request (Map) - Collected request options
-  - location (atom) - Where to put the parameter
-  - key (atom) - The name of the parameter
-  - value (any) - The value of the parameter
-
-  ## Returns
-
-  Map
   """
-  @spec add_param(map(), atom, atom, any()) :: map()
-  def add_param(request, :query, :query, values), do: Map.put(request, :query, values)
+  @spec add_param(Request.t(), atom(), atom(), any()) :: Request.t()
+  def add_param(request, :query, :query, values), do: %{request | query: values}
 
-  def add_param(request, :body, :body, value), do: Map.put(request, :body, value)
+  def add_param(request, :body, :body, value), do: %{request | body: value}
 
   def add_param(request, :body, key, value) do
     request
-    |> Map.put_new_lazy(:body, &Tesla.Multipart.new/0)
+    |> Map.put(:body, Multipart.new())
     |> Map.update!(
       :body,
-      &Tesla.Multipart.add_field(
+      &Multipart.add_field(
         &1,
         key,
         Jason.encode!(value),
-        headers: [{:"Content-Type", "application/json"}]
+        headers: [{"content-type", "application/json"}]
       )
     )
   end
 
   def add_param(request, :file, name, path) do
     request
-    |> Map.put_new_lazy(:body, &Tesla.Multipart.new/0)
-    |> Map.update!(:body, &Tesla.Multipart.add_file(&1, path, name: name))
+    |> Map.put(:body, Multipart.new())
+    |> Map.update!(:body, &Multipart.add_file(&1, path, name: name))
   end
 
   def add_param(request, :form, name, value) do
-    request
-    |> Map.update(:body, %{name => value}, &Map.put(&1, name, value))
+    Map.update(request, :body, %{name => value}, &Map.put(&1, name, value))
   end
 
   def add_param(request, location, key, value) do
     Map.update(request, location, [{key, value}], &(&1 ++ [{key, value}]))
   end
+
+  def convert_to_keyword(request) do
+    request
+    |> Map.from_struct()
+    |> Enum.into([])
+  end
 end
diff --git a/lib/pleroma/object/fetcher.ex b/lib/pleroma/object/fetcher.ex
index eaa13d1e7..263ded5dd 100644
--- a/lib/pleroma/object/fetcher.ex
+++ b/lib/pleroma/object/fetcher.ex
@@ -141,7 +141,7 @@ defmodule Pleroma.Object.Fetcher do
         date: date
       })
 
-    [{:Signature, signature}]
+    [{"signature", signature}]
   end
 
   defp sign_fetch(headers, id, date) do
@@ -154,7 +154,7 @@ defmodule Pleroma.Object.Fetcher do
 
   defp maybe_date_fetch(headers, date) do
     if Pleroma.Config.get([:activitypub, :sign_object_fetches]) do
-      headers ++ [{:Date, date}]
+      headers ++ [{"date", date}]
     else
       headers
     end
@@ -166,7 +166,7 @@ defmodule Pleroma.Object.Fetcher do
     date = Pleroma.Signature.signed_date()
 
     headers =
-      [{:Accept, "application/activity+json"}]
+      [{"accept", "application/activity+json"}]
       |> maybe_date_fetch(date)
       |> sign_fetch(id, date)
 
diff --git a/lib/pleroma/otp_version.ex b/lib/pleroma/otp_version.ex
new file mode 100644
index 000000000..114d0054f
--- /dev/null
+++ b/lib/pleroma/otp_version.ex
@@ -0,0 +1,28 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.OTPVersion do
+  @spec version() :: String.t() | nil
+  def version do
+    # OTP Version https://erlang.org/doc/system_principles/versions.html#otp-version
+    [
+      Path.join(:code.root_dir(), "OTP_VERSION"),
+      Path.join([:code.root_dir(), "releases", :erlang.system_info(:otp_release), "OTP_VERSION"])
+    ]
+    |> get_version_from_files()
+  end
+
+  @spec get_version_from_files([Path.t()]) :: String.t() | nil
+  def get_version_from_files([]), do: nil
+
+  def get_version_from_files([path | paths]) do
+    if File.exists?(path) do
+      path
+      |> File.read!()
+      |> String.replace(~r/\r|\n|\s/, "")
+    else
+      get_version_from_files(paths)
+    end
+  end
+end
diff --git a/lib/pleroma/pool/connections.ex b/lib/pleroma/pool/connections.ex
new file mode 100644
index 000000000..4d4ba913c
--- /dev/null
+++ b/lib/pleroma/pool/connections.ex
@@ -0,0 +1,283 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Pool.Connections do
+  use GenServer
+
+  alias Pleroma.Config
+  alias Pleroma.Gun
+
+  require Logger
+
+  @type domain :: String.t()
+  @type conn :: Pleroma.Gun.Conn.t()
+
+  @type t :: %__MODULE__{
+          conns: %{domain() => conn()},
+          opts: keyword()
+        }
+
+  defstruct conns: %{}, opts: []
+
+  @spec start_link({atom(), keyword()}) :: {:ok, pid()}
+  def start_link({name, opts}) do
+    GenServer.start_link(__MODULE__, opts, name: name)
+  end
+
+  @impl true
+  def init(opts), do: {:ok, %__MODULE__{conns: %{}, opts: opts}}
+
+  @spec checkin(String.t() | URI.t(), atom()) :: pid() | nil
+  def checkin(url, name)
+  def checkin(url, name) when is_binary(url), do: checkin(URI.parse(url), name)
+
+  def checkin(%URI{} = uri, name) do
+    timeout = Config.get([:connections_pool, :checkin_timeout], 250)
+
+    GenServer.call(name, {:checkin, uri}, timeout)
+  end
+
+  @spec alive?(atom()) :: boolean()
+  def alive?(name) do
+    if pid = Process.whereis(name) do
+      Process.alive?(pid)
+    else
+      false
+    end
+  end
+
+  @spec get_state(atom()) :: t()
+  def get_state(name) do
+    GenServer.call(name, :state)
+  end
+
+  @spec count(atom()) :: pos_integer()
+  def count(name) do
+    GenServer.call(name, :count)
+  end
+
+  @spec get_unused_conns(atom()) :: [{domain(), conn()}]
+  def get_unused_conns(name) do
+    GenServer.call(name, :unused_conns)
+  end
+
+  @spec checkout(pid(), pid(), atom()) :: :ok
+  def checkout(conn, pid, name) do
+    GenServer.cast(name, {:checkout, conn, pid})
+  end
+
+  @spec add_conn(atom(), String.t(), Pleroma.Gun.Conn.t()) :: :ok
+  def add_conn(name, key, conn) do
+    GenServer.cast(name, {:add_conn, key, conn})
+  end
+
+  @spec remove_conn(atom(), String.t()) :: :ok
+  def remove_conn(name, key) do
+    GenServer.cast(name, {:remove_conn, key})
+  end
+
+  @impl true
+  def handle_cast({:add_conn, key, conn}, state) do
+    state = put_in(state.conns[key], conn)
+
+    Process.monitor(conn.conn)
+    {:noreply, state}
+  end
+
+  @impl true
+  def handle_cast({:checkout, conn_pid, pid}, state) do
+    state =
+      with true <- Process.alive?(conn_pid),
+           {key, conn} <- find_conn(state.conns, conn_pid),
+           used_by <- List.keydelete(conn.used_by, pid, 0) do
+        conn_state = if used_by == [], do: :idle, else: conn.conn_state
+
+        put_in(state.conns[key], %{conn | conn_state: conn_state, used_by: used_by})
+      else
+        false ->
+          Logger.debug("checkout for closed conn #{inspect(conn_pid)}")
+          state
+
+        nil ->
+          Logger.debug("checkout for alive conn #{inspect(conn_pid)}, but is not in state")
+          state
+      end
+
+    {:noreply, state}
+  end
+
+  @impl true
+  def handle_cast({:remove_conn, key}, state) do
+    state = put_in(state.conns, Map.delete(state.conns, key))
+    {:noreply, state}
+  end
+
+  @impl true
+  def handle_call({:checkin, uri}, from, state) do
+    key = "#{uri.scheme}:#{uri.host}:#{uri.port}"
+
+    case state.conns[key] do
+      %{conn: pid, gun_state: :up} = conn ->
+        time = :os.system_time(:second)
+        last_reference = time - conn.last_reference
+        crf = crf(last_reference, 100, conn.crf)
+
+        state =
+          put_in(state.conns[key], %{
+            conn
+            | last_reference: time,
+              crf: crf,
+              conn_state: :active,
+              used_by: [from | conn.used_by]
+          })
+
+        {:reply, pid, state}
+
+      %{gun_state: :down} ->
+        {:reply, nil, state}
+
+      nil ->
+        {:reply, nil, state}
+    end
+  end
+
+  @impl true
+  def handle_call(:state, _from, state), do: {:reply, state, state}
+
+  @impl true
+  def handle_call(:count, _from, state) do
+    {:reply, Enum.count(state.conns), state}
+  end
+
+  @impl true
+  def handle_call(:unused_conns, _from, state) do
+    unused_conns =
+      state.conns
+      |> Enum.filter(&filter_conns/1)
+      |> Enum.sort(&sort_conns/2)
+
+    {:reply, unused_conns, state}
+  end
+
+  defp filter_conns({_, %{conn_state: :idle, used_by: []}}), do: true
+  defp filter_conns(_), do: false
+
+  defp sort_conns({_, c1}, {_, c2}) do
+    c1.crf <= c2.crf and c1.last_reference <= c2.last_reference
+  end
+
+  @impl true
+  def handle_info({:gun_up, conn_pid, _protocol}, state) do
+    %{origin_host: host, origin_scheme: scheme, origin_port: port} = Gun.info(conn_pid)
+
+    host =
+      case :inet.ntoa(host) do
+        {:error, :einval} -> host
+        ip -> ip
+      end
+
+    key = "#{scheme}:#{host}:#{port}"
+
+    state =
+      with {key, conn} <- find_conn(state.conns, conn_pid, key),
+           {true, key} <- {Process.alive?(conn_pid), key} do
+        put_in(state.conns[key], %{
+          conn
+          | gun_state: :up,
+            conn_state: :active,
+            retries: 0
+        })
+      else
+        {false, key} ->
+          put_in(
+            state.conns,
+            Map.delete(state.conns, key)
+          )
+
+        nil ->
+          :ok = Gun.close(conn_pid)
+
+          state
+      end
+
+    {:noreply, state}
+  end
+
+  @impl true
+  def handle_info({:gun_down, conn_pid, _protocol, _reason, _killed}, state) do
+    retries = Config.get([:connections_pool, :retry], 1)
+    # we can't get info on this pid, because pid is dead
+    state =
+      with {key, conn} <- find_conn(state.conns, conn_pid),
+           {true, key} <- {Process.alive?(conn_pid), key} do
+        if conn.retries == retries do
+          :ok = Gun.close(conn.conn)
+
+          put_in(
+            state.conns,
+            Map.delete(state.conns, key)
+          )
+        else
+          put_in(state.conns[key], %{
+            conn
+            | gun_state: :down,
+              retries: conn.retries + 1
+          })
+        end
+      else
+        {false, key} ->
+          put_in(
+            state.conns,
+            Map.delete(state.conns, key)
+          )
+
+        nil ->
+          Logger.debug(":gun_down for conn which isn't found in state")
+
+          state
+      end
+
+    {:noreply, state}
+  end
+
+  @impl true
+  def handle_info({:DOWN, _ref, :process, conn_pid, reason}, state) do
+    Logger.debug("received DOWM message for #{inspect(conn_pid)} reason -> #{inspect(reason)}")
+
+    state =
+      with {key, conn} <- find_conn(state.conns, conn_pid) do
+        Enum.each(conn.used_by, fn {pid, _ref} ->
+          Process.exit(pid, reason)
+        end)
+
+        put_in(
+          state.conns,
+          Map.delete(state.conns, key)
+        )
+      else
+        nil ->
+          Logger.debug(":DOWN for conn which isn't found in state")
+
+          state
+      end
+
+    {:noreply, state}
+  end
+
+  defp find_conn(conns, conn_pid) do
+    Enum.find(conns, fn {_key, conn} ->
+      conn.conn == conn_pid
+    end)
+  end
+
+  defp find_conn(conns, conn_pid, conn_key) do
+    Enum.find(conns, fn {key, conn} ->
+      key == conn_key and conn.conn == conn_pid
+    end)
+  end
+
+  def crf(current, steps, crf) do
+    1 + :math.pow(0.5, current / steps) * crf
+  end
+end
diff --git a/lib/pleroma/pool/pool.ex b/lib/pleroma/pool/pool.ex
new file mode 100644
index 000000000..21a6fbbc5
--- /dev/null
+++ b/lib/pleroma/pool/pool.ex
@@ -0,0 +1,22 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Pool do
+  def child_spec(opts) do
+    poolboy_opts =
+      opts
+      |> Keyword.put(:worker_module, Pleroma.Pool.Request)
+      |> Keyword.put(:name, {:local, opts[:name]})
+      |> Keyword.put(:size, opts[:size])
+      |> Keyword.put(:max_overflow, opts[:max_overflow])
+
+    %{
+      id: opts[:id] || {__MODULE__, make_ref()},
+      start: {:poolboy, :start_link, [poolboy_opts, [name: opts[:name]]]},
+      restart: :permanent,
+      shutdown: 5000,
+      type: :worker
+    }
+  end
+end
diff --git a/lib/pleroma/pool/request.ex b/lib/pleroma/pool/request.ex
new file mode 100644
index 000000000..3fb930db7
--- /dev/null
+++ b/lib/pleroma/pool/request.ex
@@ -0,0 +1,65 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Pool.Request do
+  use GenServer
+
+  require Logger
+
+  def start_link(args) do
+    GenServer.start_link(__MODULE__, args)
+  end
+
+  @impl true
+  def init(_), do: {:ok, []}
+
+  @spec execute(pid() | atom(), Tesla.Client.t(), keyword(), pos_integer()) ::
+          {:ok, Tesla.Env.t()} | {:error, any()}
+  def execute(pid, client, request, timeout) do
+    GenServer.call(pid, {:execute, client, request}, timeout)
+  end
+
+  @impl true
+  def handle_call({:execute, client, request}, _from, state) do
+    response = Pleroma.HTTP.request(client, request)
+
+    {:reply, response, state}
+  end
+
+  @impl true
+  def handle_info({:gun_data, _conn, _stream, _, _}, state) do
+    {:noreply, state}
+  end
+
+  @impl true
+  def handle_info({:gun_up, _conn, _protocol}, state) do
+    {:noreply, state}
+  end
+
+  @impl true
+  def handle_info({:gun_down, _conn, _protocol, _reason, _killed}, state) do
+    {:noreply, state}
+  end
+
+  @impl true
+  def handle_info({:gun_error, _conn, _stream, _error}, state) do
+    {:noreply, state}
+  end
+
+  @impl true
+  def handle_info({:gun_push, _conn, _stream, _new_stream, _method, _uri, _headers}, state) do
+    {:noreply, state}
+  end
+
+  @impl true
+  def handle_info({:gun_response, _conn, _stream, _, _status, _headers}, state) do
+    {:noreply, state}
+  end
+
+  @impl true
+  def handle_info(msg, state) do
+    Logger.warn("Received unexpected message #{inspect(__MODULE__)} #{inspect(msg)}")
+    {:noreply, state}
+  end
+end
diff --git a/lib/pleroma/pool/supervisor.ex b/lib/pleroma/pool/supervisor.ex
new file mode 100644
index 000000000..faf646cb2
--- /dev/null
+++ b/lib/pleroma/pool/supervisor.ex
@@ -0,0 +1,42 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Pool.Supervisor do
+  use Supervisor
+
+  alias Pleroma.Config
+  alias Pleroma.Pool
+
+  def start_link(args) do
+    Supervisor.start_link(__MODULE__, args, name: __MODULE__)
+  end
+
+  def init(_) do
+    conns_child = %{
+      id: Pool.Connections,
+      start:
+        {Pool.Connections, :start_link, [{:gun_connections, Config.get([:connections_pool])}]}
+    }
+
+    Supervisor.init([conns_child | pools()], strategy: :one_for_one)
+  end
+
+  defp pools do
+    pools = Config.get(:pools)
+
+    pools =
+      if Config.get([Pleroma.Upload, :proxy_remote]) == false do
+        Keyword.delete(pools, :upload)
+      else
+        pools
+      end
+
+    for {pool_name, pool_opts} <- pools do
+      pool_opts
+      |> Keyword.put(:id, {Pool, pool_name})
+      |> Keyword.put(:name, pool_name)
+      |> Pool.child_spec()
+    end
+  end
+end
diff --git a/lib/pleroma/reverse_proxy/client.ex b/lib/pleroma/reverse_proxy/client.ex
index 26d14fabd..0d13ff174 100644
--- a/lib/pleroma/reverse_proxy/client.ex
+++ b/lib/pleroma/reverse_proxy/client.ex
@@ -3,19 +3,23 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.ReverseProxy.Client do
-  @callback request(atom(), String.t(), [tuple()], String.t(), list()) ::
-              {:ok, pos_integer(), [tuple()], reference() | map()}
-              | {:ok, pos_integer(), [tuple()]}
+  @type status :: pos_integer()
+  @type header_name :: String.t()
+  @type header_value :: String.t()
+  @type headers :: [{header_name(), header_value()}]
+
+  @callback request(atom(), String.t(), headers(), String.t(), list()) ::
+              {:ok, status(), headers(), reference() | map()}
+              | {:ok, status(), headers()}
               | {:ok, reference()}
               | {:error, term()}
 
-  @callback stream_body(reference() | pid() | map()) ::
-              {:ok, binary()} | :done | {:error, String.t()}
+  @callback stream_body(map()) :: {:ok, binary(), map()} | :done | {:error, atom() | String.t()}
 
   @callback close(reference() | pid() | map()) :: :ok
 
-  def request(method, url, headers, "", opts \\ []) do
-    client().request(method, url, headers, "", opts)
+  def request(method, url, headers, body \\ "", opts \\ []) do
+    client().request(method, url, headers, body, opts)
   end
 
   def stream_body(ref), do: client().stream_body(ref)
@@ -23,6 +27,12 @@ defmodule Pleroma.ReverseProxy.Client do
   def close(ref), do: client().close(ref)
 
   defp client do
-    Pleroma.Config.get([Pleroma.ReverseProxy.Client], :hackney)
+    :tesla
+    |> Application.get_env(:adapter)
+    |> client()
   end
+
+  defp client(Tesla.Adapter.Hackney), do: Pleroma.ReverseProxy.Client.Hackney
+  defp client(Tesla.Adapter.Gun), do: Pleroma.ReverseProxy.Client.Tesla
+  defp client(_), do: Pleroma.Config.get!(Pleroma.ReverseProxy.Client)
 end
diff --git a/lib/pleroma/reverse_proxy/client/hackney.ex b/lib/pleroma/reverse_proxy/client/hackney.ex
new file mode 100644
index 000000000..e84118a90
--- /dev/null
+++ b/lib/pleroma/reverse_proxy/client/hackney.ex
@@ -0,0 +1,24 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.ReverseProxy.Client.Hackney do
+  @behaviour Pleroma.ReverseProxy.Client
+
+  @impl true
+  def request(method, url, headers, body, opts \\ []) do
+    :hackney.request(method, url, headers, body, opts)
+  end
+
+  @impl true
+  def stream_body(ref) do
+    case :hackney.stream_body(ref) do
+      :done -> :done
+      {:ok, data} -> {:ok, data, ref}
+      {:error, error} -> {:error, error}
+    end
+  end
+
+  @impl true
+  def close(ref), do: :hackney.close(ref)
+end
diff --git a/lib/pleroma/reverse_proxy/client/tesla.ex b/lib/pleroma/reverse_proxy/client/tesla.ex
new file mode 100644
index 000000000..e81ea8bde
--- /dev/null
+++ b/lib/pleroma/reverse_proxy/client/tesla.ex
@@ -0,0 +1,90 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.ReverseProxy.Client.Tesla do
+  @behaviour Pleroma.ReverseProxy.Client
+
+  @type headers() :: [{String.t(), String.t()}]
+  @type status() :: pos_integer()
+
+  @spec request(atom(), String.t(), headers(), String.t(), keyword()) ::
+          {:ok, status(), headers}
+          | {:ok, status(), headers, map()}
+          | {:error, atom() | String.t()}
+          | no_return()
+
+  @impl true
+  def request(method, url, headers, body, opts \\ []) do
+    check_adapter()
+
+    opts = Keyword.put(opts, :body_as, :chunks)
+
+    with {:ok, response} <-
+           Pleroma.HTTP.request(
+             method,
+             url,
+             body,
+             headers,
+             Keyword.put(opts, :adapter, opts)
+           ) do
+      if is_map(response.body) and method != :head do
+        {:ok, response.status, response.headers, response.body}
+      else
+        {:ok, response.status, response.headers}
+      end
+    else
+      {:error, error} -> {:error, error}
+    end
+  end
+
+  @impl true
+  @spec stream_body(map()) ::
+          {:ok, binary(), map()} | {:error, atom() | String.t()} | :done | no_return()
+  def stream_body(%{pid: pid, opts: opts, fin: true}) do
+    # if connection was reused, but in tesla were redirects,
+    # tesla returns new opened connection, which must be closed manually
+    if opts[:old_conn], do: Tesla.Adapter.Gun.close(pid)
+    # if there were redirects we need to checkout old conn
+    conn = opts[:old_conn] || opts[:conn]
+
+    if conn, do: :ok = Pleroma.Pool.Connections.checkout(conn, self(), :gun_connections)
+
+    :done
+  end
+
+  def stream_body(client) do
+    case read_chunk!(client) do
+      {:fin, body} ->
+        {:ok, body, Map.put(client, :fin, true)}
+
+      {:nofin, part} ->
+        {:ok, part, client}
+
+      {:error, error} ->
+        {:error, error}
+    end
+  end
+
+  defp read_chunk!(%{pid: pid, stream: stream, opts: opts}) do
+    adapter = check_adapter()
+    adapter.read_chunk(pid, stream, opts)
+  end
+
+  @impl true
+  @spec close(map) :: :ok | no_return()
+  def close(%{pid: pid}) do
+    adapter = check_adapter()
+    adapter.close(pid)
+  end
+
+  defp check_adapter do
+    adapter = Application.get_env(:tesla, :adapter)
+
+    unless adapter == Tesla.Adapter.Gun do
+      raise "#{adapter} doesn't support reading body in chunks"
+    end
+
+    adapter
+  end
+end
diff --git a/lib/pleroma/reverse_proxy/reverse_proxy.ex b/lib/pleroma/reverse_proxy/reverse_proxy.ex
index 8b713b8f4..4bbeb493c 100644
--- a/lib/pleroma/reverse_proxy/reverse_proxy.ex
+++ b/lib/pleroma/reverse_proxy/reverse_proxy.ex
@@ -3,8 +3,6 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.ReverseProxy do
-  alias Pleroma.HTTP
-
   @keep_req_headers ~w(accept user-agent accept-encoding cache-control if-modified-since) ++
                       ~w(if-unmodified-since if-none-match if-range range)
   @resp_cache_headers ~w(etag date last-modified)
@@ -58,10 +56,10 @@ defmodule Pleroma.ReverseProxy do
 
   * `req_headers`, `resp_headers` additional headers.
 
-  * `http`: options for [hackney](https://github.com/benoitc/hackney).
+  * `http`: options for [hackney](https://github.com/benoitc/hackney) or [gun](https://github.com/ninenines/gun).
 
   """
-  @default_hackney_options [pool: :media]
+  @default_options [pool: :media]
 
   @inline_content_types [
     "image/gif",
@@ -94,11 +92,7 @@ defmodule Pleroma.ReverseProxy do
   def call(_conn, _url, _opts \\ [])
 
   def call(conn = %{method: method}, url, opts) when method in @methods do
-    hackney_opts =
-      Pleroma.HTTP.Connection.hackney_options([])
-      |> Keyword.merge(@default_hackney_options)
-      |> Keyword.merge(Keyword.get(opts, :http, []))
-      |> HTTP.process_request_options()
+    client_opts = Keyword.merge(@default_options, Keyword.get(opts, :http, []))
 
     req_headers = build_req_headers(conn.req_headers, opts)
 
@@ -110,7 +104,7 @@ defmodule Pleroma.ReverseProxy do
       end
 
     with {:ok, nil} <- Cachex.get(:failed_proxy_url_cache, url),
-         {:ok, code, headers, client} <- request(method, url, req_headers, hackney_opts),
+         {:ok, code, headers, client} <- request(method, url, req_headers, client_opts),
          :ok <-
            header_length_constraint(
              headers,
@@ -156,11 +150,11 @@ defmodule Pleroma.ReverseProxy do
     |> halt()
   end
 
-  defp request(method, url, headers, hackney_opts) do
+  defp request(method, url, headers, opts) do
     Logger.debug("#{__MODULE__} #{method} #{url} #{inspect(headers)}")
     method = method |> String.downcase() |> String.to_existing_atom()
 
-    case client().request(method, url, headers, "", hackney_opts) do
+    case client().request(method, url, headers, "", opts) do
       {:ok, code, headers, client} when code in @valid_resp_codes ->
         {:ok, code, downcase_headers(headers), client}
 
@@ -210,7 +204,7 @@ defmodule Pleroma.ReverseProxy do
              duration,
              Keyword.get(opts, :max_read_duration, @max_read_duration)
            ),
-         {:ok, data} <- client().stream_body(client),
+         {:ok, data, client} <- client().stream_body(client),
          {:ok, duration} <- increase_read_duration(duration),
          sent_so_far = sent_so_far + byte_size(data),
          :ok <-
diff --git a/lib/pleroma/web/activity_pub/mrf/anti_followbot_policy.ex b/lib/pleroma/web/activity_pub/mrf/anti_followbot_policy.ex
index b3547ecd4..0270b96ae 100644
--- a/lib/pleroma/web/activity_pub/mrf/anti_followbot_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/anti_followbot_policy.ex
@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2019 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ActivityPub.MRF.AntiFollowbotPolicy do
diff --git a/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex b/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
index d9a0acfd3..dfab105a3 100644
--- a/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
@@ -12,17 +12,23 @@ defmodule Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy do
 
   require Logger
 
-  @hackney_options [
-    pool: :media,
-    recv_timeout: 10_000
+  @options [
+    pool: :media
   ]
 
   def perform(:prefetch, url) do
     Logger.debug("Prefetching #{inspect(url)}")
 
+    opts =
+      if Application.get_env(:tesla, :adapter) == Tesla.Adapter.Hackney do
+        Keyword.put(@options, :recv_timeout, 10_000)
+      else
+        @options
+      end
+
     url
     |> MediaProxy.url()
-    |> HTTP.get([], adapter: @hackney_options)
+    |> HTTP.get([], adapter: opts)
   end
 
   def perform(:preload, %{"object" => %{"attachment" => attachments}} = _message) do
diff --git a/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex b/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex
index f67f48ab6..fc3475048 100644
--- a/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex
@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2019 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ActivityPub.MRF.NoPlaceholderTextPolicy do
diff --git a/lib/pleroma/web/rel_me.ex b/lib/pleroma/web/rel_me.ex
index e97c398dc..8e2b51508 100644
--- a/lib/pleroma/web/rel_me.ex
+++ b/lib/pleroma/web/rel_me.ex
@@ -3,11 +3,9 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.RelMe do
-  @hackney_options [
+  @options [
     pool: :media,
-    recv_timeout: 2_000,
-    max_body: 2_000_000,
-    with_body: true
+    max_body: 2_000_000
   ]
 
   if Pleroma.Config.get(:env) == :test do
@@ -25,8 +23,18 @@ defmodule Pleroma.Web.RelMe do
   def parse(_), do: {:error, "No URL provided"}
 
   defp parse_url(url) do
+    opts =
+      if Application.get_env(:tesla, :adapter) == Tesla.Adapter.Hackney do
+        Keyword.merge(@options,
+          recv_timeout: 2_000,
+          with_body: true
+        )
+      else
+        @options
+      end
+
     with {:ok, %Tesla.Env{body: html, status: status}} when status in 200..299 <-
-           Pleroma.HTTP.get(url, [], adapter: @hackney_options),
+           Pleroma.HTTP.get(url, [], adapter: opts),
          {:ok, html_tree} <- Floki.parse_document(html),
          data <-
            Floki.attribute(html_tree, "link[rel~=me]", "href") ++
diff --git a/lib/pleroma/web/rich_media/parser.ex b/lib/pleroma/web/rich_media/parser.ex
index 0779065ee..40980def8 100644
--- a/lib/pleroma/web/rich_media/parser.ex
+++ b/lib/pleroma/web/rich_media/parser.ex
@@ -3,11 +3,9 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.RichMedia.Parser do
-  @hackney_options [
+  @options [
     pool: :media,
-    recv_timeout: 2_000,
-    max_body: 2_000_000,
-    with_body: true
+    max_body: 2_000_000
   ]
 
   defp parsers do
@@ -77,8 +75,18 @@ defmodule Pleroma.Web.RichMedia.Parser do
   end
 
   defp parse_url(url) do
+    opts =
+      if Application.get_env(:tesla, :adapter) == Tesla.Adapter.Hackney do
+        Keyword.merge(@options,
+          recv_timeout: 2_000,
+          with_body: true
+        )
+      else
+        @options
+      end
+
     try do
-      {:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url, [], adapter: @hackney_options)
+      {:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url, [], adapter: opts)
 
       html
       |> parse_html()
diff --git a/lib/pleroma/web/web_finger/web_finger.ex b/lib/pleroma/web/web_finger/web_finger.ex
index 43a81c75d..7ffd0e51b 100644
--- a/lib/pleroma/web/web_finger/web_finger.ex
+++ b/lib/pleroma/web/web_finger/web_finger.ex
@@ -173,7 +173,8 @@ defmodule Pleroma.Web.WebFinger do
       get_template_from_xml(body)
     else
       _ ->
-        with {:ok, %{body: body}} <- HTTP.get("https://#{domain}/.well-known/host-meta", []) do
+        with {:ok, %{body: body, status: status}} when status in 200..299 <-
+               HTTP.get("https://#{domain}/.well-known/host-meta", []) do
           get_template_from_xml(body)
         else
           e -> {:error, "Can't find LRDD template: #{inspect(e)}"}
@@ -205,7 +206,7 @@ defmodule Pleroma.Web.WebFinger do
     with response <-
            HTTP.get(
              address,
-             Accept: "application/xrd+xml,application/jrd+json"
+             [{"accept", "application/xrd+xml,application/jrd+json"}]
            ),
          {:ok, %{status: status, body: body}} when status in 200..299 <- response do
       doc = XML.parse_document(body)