“Application.ExternalCall” with Unity WebGL served from localhost

I'm loading a WebGL application from localhost:9080.
When I try to use Application.ExternalCall the javascript function I'm trying to call doesn't fire and I can see that a POST request with a weird payload (I'm assuming from Application.ExternalCall) was sent to localhost:9080 and returned 404 not found.
How can I avoid this?

 

false alarm. close thread