Questions on fs-relay TRAFFIC_RELAY_TARGET

Hi I've been testing fs-relay these days:

Just get confused on the TRAFFIC_RELAY_TARGET:

1. Firstly at client side, we need to init the fullstory with self-defined host

2. Then deploy the relay with TRAFFIC_RELAY_TARGET value (same self-defined host or https://rs.fullstory.com/)?

Would relay auto send data to https://rs.fullstory.com?

I tried both values for TRAFFIC_RELAY_TARGET
- self-defined host
- https://rs.fullstory.com

but always got 302 for this request
`https://${host}/s/settings/o-1CWRFW-na1/v1/web`