From e9145b3f888eba925b296bfdce7cd0a274ec7b22 Mon Sep 17 00:00:00 2001 From: Tulir Asokan Date: Sun, 12 Feb 2023 14:39:50 +0200 Subject: [PATCH] Set immutable cache-control header for media downloads --- synapse/media/_base.py | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/synapse/media/_base.py b/synapse/media/_base.py index ef8334ae2..aba6a0e71 100644 --- a/synapse/media/_base.py +++ b/synapse/media/_base.py @@ -184,7 +184,9 @@ def add_file_headers( # recommend caching as it's sensitive or private - or at least # select private. don't bother setting Expires as all our # clients are smart enough to be happy with Cache-Control - request.setHeader(b"Cache-Control", b"public,max-age=86400,s-maxage=86400") + request.setHeader( + b"Cache-Control", b"public,immutable,max-age=86400,s-maxage=86400" + ) if file_size is not None: request.setHeader(b"Content-Length", b"%d" % (file_size,))