Outlook Add-in: How to ajax post to another domain? - outlook-addin

Question

I'm developing an Outlook Add-in with external editor (vs-code) and with browsersync.
When I try to post via ajax i got the following error:
Failed to load
https://my_domain/report/v1/?id=YWFhfDIzfDMyNHwxfDl8MTE: Response to
preflight request doesn't pass access control check: No
'Access-Control-Allow-Origin' header is present on the requested
resource. Origin 'https://my_local:8443' is therefore not allowed
access. The response had HTTP status code 404.
I've tried to change cors to true in bsconfig.json.
My ajax function:
function ajax_post_request (url) {
var data = []
var request = $.ajax({
url: url,
async: true,
type: 'POST',
})
return request
}
How to enable Cors and Access-Control-Allow-Origin' correctly?

Answer 1

My final working ajax function:
function ajax_post_request (url, body) {
var request = $.ajax({
data: body,
crossDomain: true,
cache: false,
url: url,
async: true,
type: 'POST',
})
return request
}
My NGINX web proxy to allow CORS:
...
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Credentials' 'true';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'DNT,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control';
...