[Code health] Emit OK HTTP status in callbacks instead of onHttpsRequestAsync

[gino-m]

Since other status codes are also set by the handlers, it makes more sense to set OK (200) there as well

[rfontanarosa]

wrong direction. see #2499

[kenstershiro]

@rfontanarosa to follow up with @gino-m on the approach (currently two different PRs for this)