...

We use a Request.Builder() to create a request object with the multipart body, headers, and the URL. The following headers are necessary for the import because they contain user information of the user accessing the endpoint: Authorization header that contains the Base64-coded credentials of the user and an X-ID-TENANT-NAME header that contains the tenant name of the user. If the used OkHttp client supports cookie handling, the Authorization header can be omitted after the client's first request, since the logon information is stored in a session cookie (see alsoLogin Tutorial).

Request request = new Request.Builder()
        .header("Authorization", "Basic "+ auth)
        .header("X-ID-TENANT-NAME", tenant)
        .url(baseUrl + "/api/dms/objects") //baseUrl: "http://<host>:<port>"
        .post(requestBody)
        .build();

...