diff --git a/docs/configuration/cheatsheet.md b/docs/configuration/cheatsheet.md
index aaea3f46c..ddea6a4fb 100644
--- a/docs/configuration/cheatsheet.md
+++ b/docs/configuration/cheatsheet.md
@@ -262,6 +262,12 @@ Urls of attachments pass to script as arguments.
 
 * `script_path`: path to external script.
 
+Example:
+```elixir
+config :pleroma, Pleroma.Web.MediaProxy.Invalidation.Script,
+  script_path: "./installation/nginx-cache-purge.example"
+```
+
 #### Pleroma.Web.MediaProxy.Invalidation.Http
 
 This strategy allow perform custom http request to purge cache.
@@ -270,6 +276,14 @@ This strategy allow perform custom http request to purge cache.
 * `headers`: http headers. default is empty
 * `options`: request options. default is empty
 
+Example:
+```elixir
+config :pleroma, Pleroma.Web.MediaProxy.Invalidation.Http,
+  method: :purge,
+  headers: [],
+  options: []
+```
+
 ## Link previews
 
 ### Pleroma.Web.Metadata (provider)
diff --git a/lib/pleroma/web/media_proxy/invalidation.ex b/lib/pleroma/web/media_proxy/invalidation.ex
index 371aa8ae0..c037ff13e 100644
--- a/lib/pleroma/web/media_proxy/invalidation.ex
+++ b/lib/pleroma/web/media_proxy/invalidation.ex
@@ -1,8 +1,15 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.MediaProxy.Invalidation do
+  @moduledoc false
+
   @callback purge(list(String.t()), map()) :: {:ok, String.t()} | {:error, String.t()}
 
   alias Pleroma.Config
 
+  @spec purge(list(String.t())) :: {:ok, String.t()} | {:error, String.t()}
   def purge(urls) do
     [:media_proxy, :invalidation, :enabled]
     |> Config.get()
@@ -13,7 +20,6 @@ defp do_purge(true, urls) do
     provider = Config.get([:media_proxy, :invalidation, :provider])
     options = Config.get(provider)
     provider.purge(urls, options)
-    :ok
   end
 
   defp do_purge(_, _), do: :ok
diff --git a/lib/pleroma/web/media_proxy/invalidations/http.ex b/lib/pleroma/web/media_proxy/invalidations/http.ex
index 66fafa7ba..07248df6e 100644
--- a/lib/pleroma/web/media_proxy/invalidations/http.ex
+++ b/lib/pleroma/web/media_proxy/invalidations/http.ex
@@ -1,16 +1,40 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.MediaProxy.Invalidation.Http do
+  @moduledoc false
   @behaviour Pleroma.Web.MediaProxy.Invalidation
 
+  require Logger
+
   @impl Pleroma.Web.MediaProxy.Invalidation
   def purge(urls, opts) do
     method = Map.get(opts, :method, :purge)
     headers = Map.get(opts, :headers, [])
     options = Map.get(opts, :options, [])
 
+    Logger.debug("Running cache purge: #{inspect(urls)}")
+
     Enum.each(urls, fn url ->
-      Pleroma.HTTP.request(method, url, "", headers, options)
+      with {:error, error} <- do_purge(method, url, headers, options) do
+        Logger.error("Error while cache purge: url - #{url}, error: #{inspect(error)}")
+      end
     end)
 
     {:ok, "success"}
   end
+
+  defp do_purge(method, url, headers, options) do
+    case Pleroma.HTTP.request(method, url, "", headers, options) do
+      {:ok, %{status: status} = env} when 400 <= status and status < 500 ->
+        {:error, env}
+
+      {:error, error} = error ->
+        error
+
+      _ ->
+        {:ok, "success"}
+    end
+  end
 end
diff --git a/lib/pleroma/web/media_proxy/invalidations/script.ex b/lib/pleroma/web/media_proxy/invalidations/script.ex
index 94c79511a..6be782132 100644
--- a/lib/pleroma/web/media_proxy/invalidations/script.ex
+++ b/lib/pleroma/web/media_proxy/invalidations/script.ex
@@ -1,6 +1,14 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.MediaProxy.Invalidation.Script do
+  @moduledoc false
+
   @behaviour Pleroma.Web.MediaProxy.Invalidation
 
+  require Logger
+
   @impl Pleroma.Web.MediaProxy.Invalidation
   def purge(urls, %{script_path: script_path} = _options) do
     args =
@@ -9,7 +17,25 @@ def purge(urls, %{script_path: script_path} = _options) do
       |> Enum.uniq()
       |> Enum.join(" ")
 
-    System.cmd(Path.expand(script_path), [args])
-    {:ok, "success"}
+    path = Path.expand(script_path)
+
+    Logger.debug("Running cache purge: #{inspect(urls)}, #{path}")
+
+    case do_purge(path, [args]) do
+      {result, exit_status} when exit_status > 0 ->
+        Logger.error("Error while cache purge: #{inspect(result)}")
+        {:error, inspect(result)}
+
+      _ ->
+        {:ok, "success"}
+    end
+  end
+
+  def purge(_, _), do: {:error, "not found script path"}
+
+  defp do_purge(path, args) do
+    System.cmd(path, args)
+  rescue
+    error -> {inspect(error), 1}
   end
 end
diff --git a/test/web/media_proxy/invalidations/http_test.exs b/test/web/media_proxy/invalidations/http_test.exs
new file mode 100644
index 000000000..8a3b4141c
--- /dev/null
+++ b/test/web/media_proxy/invalidations/http_test.exs
@@ -0,0 +1,35 @@
+defmodule Pleroma.Web.MediaProxy.Invalidation.HttpTest do
+  use ExUnit.Case
+  alias Pleroma.Web.MediaProxy.Invalidation
+
+  import ExUnit.CaptureLog
+  import Tesla.Mock
+
+  test "logs hasn't error message when request is valid" do
+    mock(fn
+      %{method: :purge, url: "http://example.com/media/example.jpg"} ->
+        %Tesla.Env{status: 200}
+    end)
+
+    refute capture_log(fn ->
+             assert Invalidation.Http.purge(
+                      ["http://example.com/media/example.jpg"],
+                      %{}
+                    ) == {:ok, "success"}
+           end) =~ "Error while cache purge"
+  end
+
+  test "it write error message in logs when request invalid" do
+    mock(fn
+      %{method: :purge, url: "http://example.com/media/example1.jpg"} ->
+        %Tesla.Env{status: 404}
+    end)
+
+    assert capture_log(fn ->
+             assert Invalidation.Http.purge(
+                      ["http://example.com/media/example1.jpg"],
+                      %{}
+                    ) == {:ok, "success"}
+           end) =~ "Error while cache purge: url - http://example.com/media/example1.jpg"
+  end
+end
diff --git a/test/web/media_proxy/invalidations/script_test.exs b/test/web/media_proxy/invalidations/script_test.exs
new file mode 100644
index 000000000..1358963ab
--- /dev/null
+++ b/test/web/media_proxy/invalidations/script_test.exs
@@ -0,0 +1,20 @@
+defmodule Pleroma.Web.MediaProxy.Invalidation.ScriptTest do
+  use ExUnit.Case
+  alias Pleroma.Web.MediaProxy.Invalidation
+
+  import ExUnit.CaptureLog
+
+  test "it logger error when script not found" do
+    assert capture_log(fn ->
+             assert Invalidation.Script.purge(
+                      ["http://example.com/media/example.jpg"],
+                      %{script_path: "./example"}
+                    ) == {:error, "\"%ErlangError{original: :enoent}\""}
+           end) =~ "Error while cache purge: \"%ErlangError{original: :enoent}\""
+
+    assert Invalidation.Script.purge(
+             ["http://example.com/media/example.jpg"],
+             %{}
+           ) == {:error, "not found script path"}
+  end
+end