@Field
    public void setHttpHeaders(List<String> headers) {
        httpFetcherConfig.setHttpHeaders(new ArrayList<>());
        if (headers != null) {
            httpFetcherConfig
                    .getHttpHeaders()
                    .addAll(headers);
        }
    }
Which http headers should we capture in the metadata.
Keys will be prepended with {@link HttpFetcher#HTTP_HEADER_PREFIX}

@param headers
tika-pipes/tika-fetchers/tika-fetcher-http/src/main/java/org/apache/tika/pipes/fetcher/http/HttpFetcher.java