Set charset in content-type header

app/action.rb

@@ -22,10 +22,6 @@ module Adamantium
     handle_exception ROM::TupleCountMismatchError => :not_found
     handle_exception StandardError => :handle_error
 
-    config.default_headers = {
-      "Content-Type" => "application/octet-stream"
-    }
-
     def cache(key:, content:)
       cacher.call(key: key, content: content, expiry: TimeMath.min.advance(Time.now, +10))
     end

config.ru

@@ -20,9 +20,9 @@ end
 
 require "adamantium/middleware/header_fix"
 use Adamantium::Middleware::HeaderFix do |headers, env|
-  if env["REQUEST_METHOD"] == "HEAD"
-    headers['Content-Type'] = "text/html"
-  end
+  # if env["REQUEST_METHOD"] == "HEAD"
+    headers['Content-Type'] = "text/html; charset=utf-8"
+  # end
 end
 
 run Hanami.app