From: Antonio Terceiro <terceiro@debian.org>
Date: Mon, 10 Mar 2025 15:49:47 -0300
Subject: Rack::Accept::Response: drop usage of deprecated method

Rack 3.1 has removed `header` in favor of `headers`.

Forwarded: https://github.com/mjackson/rack-accept/pull/23
---
 lib/rack/accept/response.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/rack/accept/response.rb b/lib/rack/accept/response.rb
index 88eddf0..c4cc006 100644
--- a/lib/rack/accept/response.rb
+++ b/lib/rack/accept/response.rb
@@ -12,7 +12,7 @@ module Rack::Accept
     def not_acceptable!
       self.status = 406
       self.body = []
-      header['Content-Length'] = '0'
+      headers['Content-Length'] = '0'
     end
   end
 end