X-Git-Url: http://git.squeep.com/?a=blobdiff_plain;f=lib%2Fpleroma%2Freverse_proxy.ex;h=a25b5ea4e16f0af9c804d65a53a4fd4a7afd3fd4;hb=cc21fc5f537510416a088adff085b675de1be58e;hp=7f328d00d50df1c2531c82bb986784499c091f68;hpb=0863ec27379a09ee8367fe61da9e63c90cfe18ee;p=akkoma

diff --git a/lib/pleroma/reverse_proxy.ex b/lib/pleroma/reverse_proxy.ex
index 7f328d00d..a25b5ea4e 100644
--- a/lib/pleroma/reverse_proxy.ex
+++ b/lib/pleroma/reverse_proxy.ex
@@ -1,3 +1,7 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.ReverseProxy do
   @keep_req_headers ~w(accept user-agent accept-encoding cache-control if-modified-since if-unmodified-since if-none-match if-range range)
   @resp_cache_headers ~w(etag date last-modified cache-control)
@@ -271,11 +275,24 @@ defmodule Pleroma.ReverseProxy do
 
   defp build_resp_cache_headers(headers, _opts) do
     has_cache? = Enum.any?(headers, fn {k, _} -> k in @resp_cache_headers end)
-
-    if has_cache? do
-      headers
-    else
-      List.keystore(headers, "cache-control", 0, {"cache-control", @default_cache_control_header})
+    has_cache_control? = List.keymember?(headers, "cache-control", 0)
+
+    cond do
+      has_cache? && has_cache_control? ->
+        headers
+
+      has_cache? ->
+        # There's caching header present but no cache-control -- we need to explicitely override it to public
+        # as Plug defaults to "max-age=0, private, must-revalidate"
+        List.keystore(headers, "cache-control", 0, {"cache-control", "public"})
+
+      true ->
+        List.keystore(
+          headers,
+          "cache-control",
+          0,
+          {"cache-control", @default_cache_control_header}
+        )
     end
   end