>        Multimap<String, Object> queryParams = addQueryParams(tokenValues, 
> invocation);
> -      Multimap<String, String> headers = buildHeaders(tokenValues, 
> invocation);
> +
> +      Multimap<String, String> headers;
> +
> +      if (caller != null) {
> +         headers = buildHeaders(tokenValues, caller);

Just to ensure we're backwards-compatible here: do we know of any examples in 
the current code where this would actually do something already? I.e. is there 
anywhere in the current code where this change could end up altering 
functionality?

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