private String resolve(String url) {
        return resolve(metadata.get(Metadata.CONTENT_LOCATION), url);
    }
Adds a metadata setting from the HTML <head/> to the Tika metadata
object. The name and value are normalized where possible.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-html-module/src/main/java/org/apache/tika/parser/html/HtmlHandler.java