What you used is not the REST api. It is the “old” webapi.
Here is a very brief example Postman collection with a “get all hosts” request.
{
"info": {
"name": "CMK Rest API",
"schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
},
"item": [
{
"name": "Get all Hosts",
"event": [
{
"listen": "prerequest",
"script": {
"exec": [
""
],
"type": "text/javascript"
}
}
],
"request": {
"method": "GET",
"header": [
{
"key": "Accept",
"value": "application/json",
"type": "text"
}
],
"url": {
"raw": "http://monitoringhost/sitename/check_mk/api/1.0/domain-types/host_config/collections/all",
"protocol": "http",
"host": [
"monitoringhost",
],
"path": [
"sitename",
"check_mk",
"api",
"1.0",
"domain-types",
"host_config",
"collections",
"all"
]
}
},
"response": []
}
],
"auth": {
"type": "bearer",
"bearer": [
{
"key": "token",
"value": "automation automationsecret",
"type": "string"
}
]
},
"event": [
{
"listen": "prerequest",
"script": {
"type": "text/javascript",
"exec": [
""
]
}
},
{
"listen": "test",
"script": {
"type": "text/javascript",
"exec": [
""
]
}
}
]
}
Documentation an REST api gui can be found here.