[FEATURE] I want to limit the domains returned in the Access-Control-Allow-Origin header for a given HTTP endpoint

Currently, Pipedream returns the following headers in response to requests to HTTP endpoints:

```
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,HEAD,PUT,PATCH,POST,DELETE
```

I have no control over the Origin returned in the header, so I can't prevent browser-initiated requests from reaching my endpoint from other domains. I'd ideally like to control the value of the header returned for my endpoint.