combo load json format

Webix JS
#1

What is the format that should be returned when loading new options for a combo component?

https://snippet.webix.com/j8q7kpkr

  • how to force a Content-Type: application/json request?
  • returning [{id:‘3’,value:‘3’},{id:‘4’,value:‘4’}] is not working
#2

bump

#3

how to force a Content-Type: application/json request?
it is done by default setting Content-Type header to application/json
returning [{id:‘3’,value:‘3’},{id:‘4’,value:‘4’}] is not working
do you receive any error?
in this snippet it works as expected
https://snippet.webix.com/zxakt30p
pay attention to double quotes