REST trigger

[tdv94lnn]

I have 2 raspberrypi's. On of them is the "master" and running domoticz. The other one is a "slave" doing some stuff that is trigged by a REST api, implementet in a spring boot application. The application respons is http ok (200) on all commands. The triggers is raised by http call in the "On action" field under some swithches in domoticz.

Every time a switch is triggered domoticz loggs .... Error: Error opening url: ....
However, the receiving application in the "slave" is called and everything works fine.

I added url's in "Local Networks" for localhost and subnet's.

Does anyone knows what can couse this error log?