Custom call to from Thingworx to Windchill with SSO

I want to run  https://hostname/Windchill/servlet/custom/getNumber?number=123456
with SSO
This URL returns in postman STRING text 

Code from bellow works but I need SSO. That's why I created Swagger connector

let headers = {
 "Accept": "text/plain",
 "Authorization": authorization
}
 
let params = {
 proxyScheme: undefined /* STRING {"defaultValue":"http"} */,
 headers: headers /* JSON */,
 ignoreSSLErrors: undefined /* BOOLEAN */,
 useNTLM: undefined /* BOOLEAN {"defaultValue":false} */,
 workstation: undefined /* STRING {"defaultValue":""} */,
 useProxy: undefined /* BOOLEAN {"defaultValue":false} */,
 withCookies: undefined /* BOOLEAN {"defaultValue":false} */,
 proxyHost: undefined /* STRING {"defaultValue":""} */,
 url: "https://hostname/Windchill/servlet/custom/getNumber?number=1234567" /* STRING */,
 timeout: undefined /* NUMBER {"defaultValue":60} */,
 appendHeader: undefined /* BOOLEAN {"defaultValue":true} */,
 proxyPort: undefined /* INTEGER {"defaultValue":8080} */,
 password: undefined /* STRING */,
 domain: undefined /* STRING {"defaultValue":""} */,
 username: undefined /* STRING */,
};
 
// result: STRING
let result = Resources["ContentLoaderFunctions"].GetText(params);