Add HTTP_ORIGIN feature

[Genjo]

Indicates the origin of the cross-site access request or preflight request:
https://developer.mozilla.org/fr/docs/HTTP/Access_control_CORS#Compatibilit.C3.A9_navigateurs

Should I refers to http://caniuse.com/#feat=cors?

[GPHemsley]

The underlying page MDN page has changed, so it's unclear exactly what this is referring to.

The link mentioned above, which is indeed already attached to https://caniuse.com/cors, now redirects here:
https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS

The only browser compat data on that page is about the Access-Control-Allow-Origin header, which the MDN browser compat data tracks but does not appear to have its own separate caniuse URL.

Additionally, the Origin header is now also covered by MDN data:
https://caniuse.com/mdn-http_headers_origin