Maybe this helps:
[{"id":"f812e60c.6453c","type":"ui_slider","z":"f1a51433.4fb368","name":"Küchenslider","label":"","tooltip":"","group":"bd3c2028.1a693","order":4,"width":"6","height":"1","passthru":true,"outs":"end","topic":"","min":0,"max":"100","step":1,"x":430,"y":180,"wires":[["27a93478.46fee4"]]},{"id":"b5cae51e.e66648","type":"http request","z":"f1a51433.4fb368","name":"Küchenfenster_Slider_Position","method":"GET","ret":"obj","paytoqs":true,"url":"http://192.168.XXX.20/roller/0?go=to_pos&roller_pos={{payload.msg}}","tls":"","persist":false,"proxy":"","authType":"basic","x":810,"y":160,"wires":[["b12aeef3.f11cc"]]},{"id":"b12aeef3.f11cc","type":"debug","z":"f1a51433.4fb368","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":850,"y":320,"wires":[]},{"id":"4a87804b.ff31a","type":"debug","z":"f1a51433.4fb368","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":570,"y":320,"wires":[]},{"id":"27a93478.46fee4","type":"function","z":"f1a51433.4fb368","name":"","func":"var message = msg.payload;\nvar url = \"http://192.168.xxx.20/roller/0?go=to_pos&roller_pos=\";\n//msg = url.toString() + message.toString();\nreturn {\"payload\": message};\n\n\n//x = msg.toString(8);\n//return \"http://192.168.178.20/roller/0?go=to_pos&roller_pos=\"+ msg.toString();\n\n//msg1 = (\"http://192.168.xxx.20/roller/0?go=to_pos&roller_pos=\"+ x);\n//return msg1;","outputs":1,"noerr":0,"x":610,"y":220,"wires":[["4a87804b.ff31a","b5cae51e.e66648"]]},{"id":"bd3c2028.1a693","type":"ui_group","z":"","name":"Rolläden","tab":"f2bb749e.fdb478","order":1,"disp":true,"width":"18","collapse":false},{"id":"f2bb749e.fdb478","type":"ui_tab","z":"","name":"Rolläden","icon":"dashboard","disabled":false,"hidden":false}]