Http binding - post data question


i have a really stupid question.

The Relays on my Uinpi Board can be switch on the following command

switch on:

wget -qO- http://localhost:8088/rest/relay/1 --post-data='value=1'

switch off:

wget -qO- http://localhost:8088/rest/relay/1 --post-data='value=0'

now, i installed the http binding an created the Switch Item into default.items

Switch MyItem1 { http=">[ON:POST:http://localhost:8088/rest/relay/1:value=1] >[OFF:POST:http://localhost:8088/rest/relay/1:value=0]" }

The switchitem is also created on my sitemap.

Switch item=MyItem1 label="Kaminpumpe"

The switch does not work.

What am I doing wrong?