Which headers does propagateTraceHeaderCorsUrls enables with FetchInstrumentation class and how to have tracestate propagated?

[alioshr]

Hello

I am currently integrating our Frontend with faro-sdk and for now we need to override the sdk config to enable traces propagation.

This is the link to the discussion for context

My doubt is which headers will get propagated by using the property propagateTraceHeaderCorsUrls?

import { FetchInstrumentation } from '@opentelemetry/instrumentation-fetch';
import { XMLHttpRequestInstrumentation } from '@opentelemetry/instrumentation-xml-http-request';

// .....
          new FetchInstrumentation({
            ignoreUrls,
            propagateTraceHeaderCorsUrls,
          }),
          new XMLHttpRequestInstrumentation({
            ignoreUrls,
            propagateTraceHeaderCorsUrls,
          }),
// ......

I have noticed that the traceparent header is successfully propagated, but I also need the tracestate header. How can I achieve this using OTEL, or is it already supposed to add this header as well?

I did not find anything at all documenting these classes and their usage.

Thanks in advance!