Javascript SDK Post request 404

[gate6splunk]

I am trying to send Post request in Storage Password service but it is giving 404 error and sending request on 8000 port and not on 8089 port. Below is the sample code :

let storage_pwd = new splunk_js_sdk.Service.StoragePassword(splunk_js_sdk_service, 'test', application_name_space);

storage_pwd.post('test',{name: "Splunker",

realm: "SDK",

password: "password_here"}, function(e,r){

console.log(e,r);

})

common.js:1035 POST http://localhost:8000/en-US/splunkd/__raw/servicesNS/nobody/test/storage/passwords/test/test?output_mode=json

404 (Not Found)

Any help will be appreciable.