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-rw-r--r--actionpack/lib/action_dispatch/http/response.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index f71c6afd6c..516a2af69a 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -227,7 +227,9 @@ module ActionDispatch # :nodoc:
return unless content_type
new_header_info = parse_content_type(content_type.to_s)
prev_header_info = parsed_content_type_header
- set_content_type new_header_info.mime_type, new_header_info.charset || prev_header_info.charset || self.class.default_charset
+ charset = new_header_info.charset || prev_header_info.charset
+ charset ||= self.class.default_charset unless prev_header_info.mime_type
+ set_content_type new_header_info.mime_type, charset
end
# Sets the HTTP response's content MIME type. For example, in the controller