CirrOS netcat doesn't close connection

[Grigory]

I'm using netcat to establish basic http server:

nohup sh -c "while true; do echo -e 'HTTP/1.0 200 OK\r\n\r\nserver' | sudo nc -l -p 80 ; done" &

I'm able to get response from this server if it's running on CirrOS 3.0.0. But if I use CirrOS 3.4.0 the server doesn't close connection. I receive HTTP response body though.

CirrOS 3.4.0:
$ curl http://localhost
server
^C

CirrOS 3.0.0 (doesn't have curl onboard, so I used another host):
stack@lab:~$ curl http://10.0.0.5
server
stack@lab:~$

I'm running CirrOS under KVM in the latest version of Openstack Liberty, specifically Devstack