Make the property glide.rest.debug to true and check the HTTP log or Node Browser Log

From where can I access the HTTP log ?

Type http in the navigation bar, you should see it

In my instance it will only show options for outbound logs

Did you also check Node Log file browser

Check the below doc for reference

https://docs.servicenow.com/bundle/kingston-application-development/page/integrate/inbound-rest/reference/r_DebuggingRESTQueries.html