Bug: RSS feed is served as 'application/octet-stream' instead of 'application/rss+xml' #3203

Describe the bug

When loading the RSS feed linked from the 'Our Blogs' page via the link in the sidebar, it is served as 'application/octet-stream' instead of 'application/rss+xml', resulting in Safari (and Waterfox) wanting to download it as a file instead of handing it off to the application registered for that purpose.

To Reproduce

Go to the 'Our Blogs' page in either Safari or Waterfox on a Mac, and click on the 'RSS' link in the 'Subscribe to Python Insider via' sidebar segment. The browser will offer to download the feed as a file.

Check the content type header via curl;

% curl -I "https://blog.python.org/feeds/posts/default?alt=rss"
HTTP/2 200 
server: GitHub.com
content-type: application/octet-stream
last-modified: Mon, 26 Oct 2026 04:31:30 GMT
access-control-allow-origin: *
etag: "6aded7a2-609e"
expires: Thu, 29 Oct 2026 20:42:04 GMT
cache-control: max-age=600
x-proxy-cache: HIT
x-github-request-id: C63A:1F8871:4739843:47FC02C:6AE3D3A1
x-github-edge-region: fra
accept-ranges: bytes
age: 0
date: Fri, 30 Oct 2026 04:03:16 GMT
via: 1.1 varnish
x-served-by: cache-rtm-ehrd2290021-RTM
x-cache: HIT
x-cache-hits: 0
x-timer: S1793332997.726940,VS0,VE116
vary: Accept-Encoding
x-fastly-request-id: 5d4a77ac8721c70f694d76036b7669505504919f
content-length: 24734

Expected behavior

The content type should be 'application/rss+xml' instead.

URL to the issue

No response

Screenshots

"![SCREENSHOT_DESCRIPTION](SCREENSHOT_LINK.png)"

Browsers

Safari

Operating System

macOS

Browser Version

Version 27.2 (22625.2.8.11.9)

Relevant log output

Additional context