Comment 4 for bug 1555019

Here you have all requests and responses headers:

HEAD /images/PLATFORM_010.vdi HTTP/1.1
Host: XXXXXXXXXXX
Connection: keep-alive
Accept-Encoding: gzip, deflate
Accept: */*
User-Agent: python-requests/2.9.1

HTTP/1.1 200 OK
Date: Thu, 09 Feb 2017 15:17:26 GMT
Connection: keep-alive
X-Content-Type-Options: nosniff
Last-Modified: Wed, 08 Feb 2017 14:45:16 GMT
ETag: "310b00000-54805e9ae020c-gzip"
Accept-Ranges: bytes
Cache-Control: max-age=1209600
Expires: Thu, 23 Feb 2017 15:17:26 GMT
Vary: Accept-Encoding
Content-Encoding: gzip
Server: Apache/2

GET /images/PLATFORM_010.vdi HTTP/1.1
Host: XXXXXXXXXXXX
Connection: keep-alive
Accept-Encoding: gzip, deflate
Accept: */*
User-Agent: python-requests/2.9.1

HTTP/1.1 200 OK
Date: Thu, 09 Feb 2017 15:17:26 GMT
Transfer-Encoding: chunked
Connection: keep-alive
X-Content-Type-Options: nosniff
Last-Modified: Wed, 08 Feb 2017 14:45:16 GMT
ETag: "310b00000-54805e9ae020c-gzip"
Accept-Ranges: bytes
Cache-Control: max-age=1209600
Expires: Thu, 23 Feb 2017 15:17:26 GMT
Vary: Accept-Encoding
Content-Encoding: gzip
Server: Apache/2