RSS2 feeds are published as text/xml rather than application/rss+xml

[Orakel78]

It seems to me that there is a bug in feed-rss.php, feed-rss2.php and feed-rss2-comments.php

All files have the following header

header('Content-Type: ' . feed_content_type('rss-http') . '; charset=' . get_option('blog_charset'), true);

Which seems to publish the feed as text/xml rather than application/rss+xml which I believe it should be.

[SergeyBiryukov]

Current header was introduced in [11358] as a fix for #9810.

See also: ​The Proper Content Type for XML Feeds.

[solarissmoke]

There is a filter on feed_content_type if you want to change this yourself - but until the issues with compatibility are resolved I don't think core will change.