I investigated a little further, here's the results of two HEAD requests to launchpadlibrarian.net:
HEAD /58498441/pyOpenSSL-0.11.tar.gz HTTP/1.1 Host: launchpadlibrarian.net
HTTP/1.1 200 OK Date: Sat, 15 Jan 2011 12:56:20 GMT Server: TwistedWeb/10.1.0 Content-Length: 242152 Accept-Ranges: bytes Last-Modified: Mon, 01 Nov 2010 22:24:33 GMT Cache-Control: max-age=31536000, public Content-Type: text/html Age: 182423 X-Cache: HIT from nutmeg.canonical.com X-Cache-Lookup: HIT from nutmeg.canonical.com:3128 Via: 1.0 nutmeg.canonical.com:3128 (squid/2.7.STABLE7) Via: 1.1 launchpadlibrarian.net Vary: Accept-Encoding
HTTP/1.1 200 OK Date: Fri, 14 Jan 2011 22:13:19 GMT Server: TwistedWeb/10.1.0 Content-Length: 242152 Accept-Ranges: bytes Last-Modified: Mon, 01 Nov 2010 22:24:33 GMT Cache-Control: max-age=31536000, public Content-Type: application/x-tar Age: 235405 X-Cache: HIT from banana.canonical.com X-Cache-Lookup: HIT from banana.canonical.com:3128 Via: 1.0 banana.canonical.com:3128 (squid/2.7.STABLE7) Via: 1.1 launchpadlibrarian.net
I investigated a little further, here's the results of two HEAD requests to launchpadlibrar ian.net:
HEAD /58498441/ pyOpenSSL- 0.11.tar. gz HTTP/1.1 ian.net
Host: launchpadlibrar
HTTP/1.1 200 OK canonical. com canonical. com:3128 canonical. com:3128 (squid/2.7.STABLE7) ian.net
Date: Sat, 15 Jan 2011 12:56:20 GMT
Server: TwistedWeb/10.1.0
Content-Length: 242152
Accept-Ranges: bytes
Last-Modified: Mon, 01 Nov 2010 22:24:33 GMT
Cache-Control: max-age=31536000, public
Content-Type: text/html
Age: 182423
X-Cache: HIT from nutmeg.
X-Cache-Lookup: HIT from nutmeg.
Via: 1.0 nutmeg.
Via: 1.1 launchpadlibrar
Vary: Accept-Encoding
HEAD /58498441/ pyOpenSSL- 0.11.tar. gz HTTP/1.1 ian.net
Host: launchpadlibrar
HTTP/1.1 200 OK canonical. com canonical. com:3128 canonical. com:3128 (squid/2.7.STABLE7) ian.net
Date: Fri, 14 Jan 2011 22:13:19 GMT
Server: TwistedWeb/10.1.0
Content-Length: 242152
Accept-Ranges: bytes
Last-Modified: Mon, 01 Nov 2010 22:24:33 GMT
Cache-Control: max-age=31536000, public
Content-Type: application/x-tar
Age: 235405
X-Cache: HIT from banana.
X-Cache-Lookup: HIT from banana.
Via: 1.0 banana.
Via: 1.1 launchpadlibrar