public DocServiceBuilder injectedScriptSupplier(
            BiFunction<ServiceRequestContext, HttpRequest, String> supplier) {
        injectedScriptSuppliers.add(requireNonNull(supplier, "supplier"));
        return this;
    }
Adds a supplier for Javascript scripts to inject into the {@code <head />} of the debug page HTML.
The supplier will be called every request for the initial {@link DocService} HTML. This can be used to
customize the debug page per-request (e.g., to provide a HeaderProvider for enabling authentication based
on an injected timestamped token). All scripts are concatenated into the content of a single script tag.
core/src/main/java/com/linecorp/armeria/server/docs/DocServiceBuilder.java