Feature Request: Support for Dynamic Header Suppliers in HttpConnectorOptions

Currently, HttpConnectorOptions.java allows for a static Map<String, String> of headers. While this works for fixed metadata, it is insufficient for headers that change over time or expire, such as bearer tokens or short-lived security signatures.

I would like to propose adding an option to provide a dynamic callback (e.g., a Supplier or a Functional Interface) that is evaluated just before each request is dispatched.

Maybe, in addition to the static map, we could have a method like the following:

public void addHeaderProvider(String headerName, Supplier<String> valueSupplier)

to add dynamic headers when building the request?

Start with HttpConnectorOptions.java, especially the existing static header configuration, then trace where the HTTP request is dispatched. Define how a dynamic header provider is configured and evaluated immediately before each request while preserving static headers. Done means changing headers such as expiring bearer tokens can be supplied per request.