Referer

This might be a noob question. Hoping for you guidance.
The referer is not being passed to http client when I am making a request.
Is this how it behaves?

```js
fetch('api/endpoint')
```
The fetch to the endpoint has the referer but in the http client, it is empty.
Setting it manually does not work also.

```
proxyReq.Header.Set("Referer", "https://example.com/")
```