Why is my Github-hosted site responding with HTTP 302 instead of 200?

Question

I own the domain penkov.id.au. I host a blog using github, with an A record for the subdomain michael.penkov.id.au pointing to the github pages server (204.232.175.

Answer 1

I'm met with a 200 HTTP response.:

GET http://michael.penkov.id.au/blog/2014/01/02/reinventing-the-wheel.html

HTTP/1.1 200 OK
Server: GitHub.com
Date: Thu, 02 Jan 2014 16:04:17 GMT
Content-Type: text/html
Connection: keep-alive
Content-Length: 10314
Last-Modified: Thu, 02 Jan 2014 14:38:15 GMT
Expires: Thu, 02 Jan 2014 16:14:17 GMT
Cache-Control: max-age=600
Vary: Accept-Encoding
Accept-Ranges: bytes
Vary: Accept-Encoding

You're likely waiting for Facebook (and other services') DNS cache to flush. It shouldn't take more than 48 hours. I can sometimes get the Facebook Debugger to return a 200, but it still has errors, because of this HTML tag on the page pointing elsewhere: