HTTP/1.1 servers and persistent connections

Can a HTTP/1.1 server decline to provide support to persistent connections?

From what I read in the RFC, it looks like it's not mandatory for HTTP/1.1 servers to support persistent connections, but rather _highly recommended_.

Is this correct?

http://www.laptop-battery-accessories.com/laptop-ac-adapter-c-66.html
http://www.laptop-battery-accessories.com/fujitsu-fmvnbp132--fmvnbp133--fmvnbp135-laptop-battery-p-24347.html
http://www.laptop-battery-accessories.com/fujitsu-fmvnbp136--fpcbp112--fpcbp112ap-laptop-battery-p-24348.html
http://www.laptop-battery-accessories.com/fujitsu-fmv-b8200--lifebook-b6000d-laptop-battery-p-24349.html
http://www.laptop-battery-accessories.com/fujitsu-lifebook-b6110--lifebook-b6110d-laptop-battery-p-24350.html
http://www.laptop-battery-accessories.com/11.1v-2200mah-acer-um08a51--um08a52-battery-p-19757.html
http://www.laptop-battery-accessories.com/11.1v-2200mah-acer-um08a51--um08a52-battery-p-19757.html
http://www.laptop-battery-accessories.com/sony-vaio-vgn-sz22cp-laptop-battery--p-14656.html
http://www.laptop-battery-accessories.com/9-cell-sony-vaio-vgn-sz22cp-battery-p-8146.html
http://www.laptop-battery-accessories.com/10.8v-9600mah-toshiba-satellite-l675d-s7012-latpop-battery-p-24351.html
http://www.oklaptopbattery.com/laptop-battery/acer-BTP-AS3620-laptop-battery.html
http://www.oklaptopbattery.com/laptop-battery/acer-LC.BTP00.021-laptop-battery.html
http://www.oklaptopbattery.com/laptop-battery/acer-MS2180-laptop-battery.html
http://www.oklaptopbattery.com/laptop-battery/acer-BTP-AOJ1-laptop-battery.html
http://www.oklaptopbattery.com/laptop-battery/acer-BTP-ASJ1-laptop-battery.html
http://www.oklaptopbattery.com/laptop-battery/acer-LC.BTP00.022-laptop-battery.html
http://www.oklaptopbattery.com/laptop-battery/acer-TM07B41-laptop-battery.html
http://www.oklaptopbattery.com/laptop-battery/acer-Aspire-3620-Series-laptop-batteries.html
http://www.oklaptopbattery.com/laptop-battery/acer-TravelMate-3280-Series-laptop-batteries.html