Attachement API File Post - Reading file from system into request body?

[KW68]

var request = new sn_ws.RESTMessageV2();

        request.setHttpMethod('post');

        request.setEndpoint('https://dev261030.service-now.com/api/now/attachment/file?table_name=ZZ_YYsc_cat_item&table_sys_id=7...');

        request.setRequestHeader('Accept', 'application/json');

        request.setRequestHeader('Content-Type', 'image/png');  

        request.setBasicAuth('#######','#########');  

        //How do I read the system file 'C:/Users/rwebb1/OneDrive - Klein ISD/Desktop/picture.png' into the request body?

        //request.setRequestBody('data-binary', '@C:/Users/rwebb1/OneDrive - Klein ISD/Desktop/picture.png');

        var response = request.execute();

        gs.info("http response status_code: " + response.getStatusCode());

        gs.info("http response boddy: " + response.getBody());  

[-O-]

That API only works from whatever can emulate a browser.

In fact if you look at code samples for this API in the REST API Explorer - as apposed to other APIs, only contains a cURL example, which is basically a browser.

If servers had the capability to arbitrarily read out local files from users' computers, that would be hackers', even wannabe hackers' paradise.