Add referer to fields

[omid]

Add http referer to the fields

[LukeMathWalker]

This is not part of OpenTelemetry's HTTP semantic conventions.
The proper field name should be http.request.header.referer, but I don't see a reason to add it among the default fields.

[omid]

@LukeMathWalker, Is there a specfic way to add custom fields next to the default fields?

[LukeMathWalker]

Yes, via root_span!

[omid]

@LukeMathWalker thanks. It helped a lot. I was not aware of the convention.

Out of curiosity, why user_agent.original, based on otel semantic conventions, named http.user_agent in the library?
Or http.response.status_code named simply http.status_code?

[LukeMathWalker]

Historical mistakes we now have to live with—changing the field names now would be quite dangerous (e.g. folks are probably relying on them for alerts).