Comment 4 for bug 1685399

I discussed this with mvo; here's the debug output he requested from a run of 'apt-get update -o debug::acquire::http=true':

...

GET /ubuntu/dists/xenial-updates/InRelease HTTP/1.1
Host: 192.168.122.218
Cache-Control: max-age=0
Accept: text/*
Range: bytes=102145-
If-Range: Fri, 21 Apr 2017 23:25:00 GMT
User-Agent: Debian APT-HTTP/1.3 (1.2.19)

Answer for: http://192.168.122.218/ubuntu/dists/xenial-updates/InRelease
HTTP/1.1 416 Requested Range Not Satisfiable
Server: nginx/1.10.0 (Ubuntu)
Date: Fri, 05 May 2017 14:19:34 GMT
Content-Type: text/html
Content-Length: 222
Connection: keep-alive
Content-Range: bytes */102145

...