Content-Type of XML feeds is misstated as 'text/html'

[celejar0]

I access blog XML feeds via a caching proxy (squid). The Content-Type in the HTTP response headers is initially reported correctly as 'text/xml', but when a subsequent request is made and the object is stale, wordpress sometimes returns a '304 Not Modified', but also incorrectly re-characterizes the Content-Type as 'text/html'. Example:

HTTP/1.0 304 Not Modified
X-Pingback: http://wordpress.org/development/xmlrpc.php
Last-Modified: Sat, 31 Oct 2009 21:28:00 GMT
ETag: "a4aa82a49dbe294617210eb367fa0997"
Content-type: text/html
Date: Mon, 02 Nov 2009 01:25:17 GMT
Server: LiteSpeed
Connection: close

I've seen this on 'wordpress.org/development/feed' (LiteSpeed), on a wordpress.com hosted blog (nginx), and on an independent site running wordpress (Apache).

[Denis-de-Bernardy]

See also: #11865

[dd32]

In my testing, Apache/PHP5.3 ignore the content-type header for 304 responses.

Try the attached patch, and see if it works for you.

[dd32]

No reporter feedback in 4 years, unable to duplicate.

This appears as if it may have been something in Squid reporting an incorrect content-type, I've been unable to duplicate it, and can't see anything in WordPress that could cause it.