From 8003c07762931d77282f436109629b144925ffe7 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Fri, 12 Jun 2020 18:06:55 -0700
Subject: [PATCH] modules/media: Add explicit cache controls w/ immutability
 hint.

---
 modules/media/download.cc  | 11 ++++++++++-
 modules/media/thumbnail.cc |  9 +++++++--
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/modules/media/download.cc b/modules/media/download.cc
index 69b6e96d5..3fff601ba 100644
--- a/modules/media/download.cc
+++ b/modules/media/download.cc
@@ -127,10 +127,19 @@ get__download_local(client &client,
 		};
 	});
 
+	static const auto &addl_headers
+	{
+		"Cache-Control: public, max-age=31536000, immutable\r\n"_sv
+	};
+
 	// Send HTTP head to client
 	m::resource::response
 	{
-		client, http::OK, content_type, file_size
+		client,
+		http::OK,
+		content_type,
+		file_size,
+		addl_headers,
 	};
 
 	size_t sent{0}, read
diff --git a/modules/media/thumbnail.cc b/modules/media/thumbnail.cc
index 4addacf53..be5f5b08e 100644
--- a/modules/media/thumbnail.cc
+++ b/modules/media/thumbnail.cc
@@ -327,10 +327,15 @@ get__thumbnail_local(client &client,
 				"Unknown reason",
 		};
 
+	static const auto &addl_headers
+	{
+		"Cache-Control: public, max-age=31536000, immutable\r\n"_sv
+	};
+
 	if(fallback)
 		return m::resource::response
 		{
-			client, buf, content_type
+			client, buf, content_type, http::OK, addl_headers
 		};
 
 	const auto closure{[&client, &content_type]
@@ -338,7 +343,7 @@ get__thumbnail_local(client &client,
 	{
 		m::resource::response
 		{
-			client, buf, content_type
+			client, buf, content_type, http::OK, addl_headers
 		};
 	}};