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Cisco 3750 --- Mark TCP packets from port 80 with DSCP ef

Good afternoon,
I am trying to mark outgoing traffic from a web server with value of DSCP ef
When I am doing a traffic capture all TCP packets have tos 0x0
If I marked UDP packets, or icmp packets, I can see it with in trafic capture, but not TCP traffic.

This is my config,

mls qos
ip access-list extended MARK-HTTP-ACL
  permit tcp host eq www any

class-map match-any HTTP-CM
match access-group name MARK-HTTP-ACL
policy-map PRIORITY-PM
class HTTP-CM
  set dscp ef

interface GigabitEthernet1/0/11
switchport access vlan 20
switchport mode access
spanning-tree portfast
mls qos trust dscp
service-policy input PRIORITY-PM

Can anybody can help me to understand, why I cannot mark TCP packets?

Thank you