Bug#722497:
I can also confirm that partial requests seem to cause this problem:
####
T 2001:44b8:1109:4900:a00:27ff:fe4c:1ee5:42605 ->
2001:388:30bc:cafe::beef:80 [AP]
GET /pub/debian-multimedia/dists/sid/InRelease HTTP/1.1.
User-Agent: Debian Apt-Cacher-NG/0.7.25.
Host: mirror.aarnet.edu.au.
Range: bytes=26385-.
If-Range: Tue, 16 Apr 2013 09:36:21 GMT.
Cache-Control: no-store,no-cache,max-age=0.
Accept: */*.
Connection: keep-alive.
.
#####
T 10.1.1.77:42138 -> 150.101.135.3:80 [AP]
GET /pub/debian/dists/sid/InRelease HTTP/1.1.
User-Agent: Debian Apt-Cacher-NG/0.7.25.
Host: mirror.internode.on.net.
Range: bytes=198983-.
If-Range: Thu, 13 Mar 2014 02:53:19 GMT.
Cache-Control: no-store,no-cache,max-age=0.
Accept: */*.
Connection: keep-alive.
.
##
T 150.101.135.3:80 -> 10.1.1.77:42138 [AP]
HTTP/1.1 206 Partial Content.
Server: nginx/1.0.12.
Date: Thu, 13 Mar 2014 08:03:52 GMT.
Content-Type: application/octet-stream.
Content-Length: 1.
Last-Modified: Thu, 13 Mar 2014 02:53:19 GMT.
Connection: keep-alive.
Keep-Alive: timeout=20.
Content-Range: bytes 198983-198983/198984.
.
#####
T 2001:44b8:1109:4900:a00:27ff:fe4c:1ee5:42608 ->
2001:388:30bc:cafe::beef:80 [AP]
GET /pub/debian-multimedia/dists/sid/InRelease HTTP/1.1.
User-Agent: Debian Apt-Cacher-NG/0.7.25.
Host: mirror.aarnet.edu.au.
Range: bytes=26385-.
If-Range: Tue, 16 Apr 2013 09:36:21 GMT.
Cache-Control: no-store,no-cache,max-age=0.
Accept: */*.
Connection: keep-alive.
.
#######
T 2001:44b8:1109:4900:a00:27ff:fe4c:1ee5:42609 ->
2001:388:30bc:cafe::beef:80 [AP]
GET /pub/debian-multimedia/dists/sid/InRelease HTTP/1.1.
User-Agent: Debian Apt-Cacher-NG/0.7.25.
Host: mirror.aarnet.edu.au.
Range: bytes=26385-.
If-Range: Tue, 16 Apr 2013 09:36:21 GMT.
Cache-Control: no-store,no-cache,max-age=0.
Accept: */*.
Connection: keep-alive.
.
sources.list:
deb http://localhost:3142/mirror.internode.on.net/pub/debian sid main
non-free contrib
deb-src http://localhost:3142/mirror.internode.on.net/pub/debian sid
main non-free contrib
deb http://localhost:3142/mirror.aarnet.edu.au/pub/debian-multimedia
sid main non-free
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