In universal Plug and Play Device Architecture
Specification in section 4.1.1 (4.1.1 Eventing:
Subscribing: SUBSCRIBE with NT and CALLBACK)
specified this message to answer on subscription
HTTP/1.1 200 OK
DATE: when response was generated
SERVER: OS/version UPnP/1.0 product/version
SID : uuid: subscription-UUID
TIMEOUT: Second- actual subscription duration
(No body for response to a request with method
SUBSCRIBE, but note that the message must have a
blank line following the last HTTP header.)
This message does not include 'Content-Length: 0'
HTTP header/value. It is necessary for DLNA test.
Path for cvs libupnp version in attachment.