public String getHeader(String name) {
		List<String> values = parent.headers().get(name);
		if (values == null || values.isEmpty()) {
			return null;
		}
		return values.get(values.size() - 1);
	}
Adds a header with the given name and value
@see com.yahoo.jdisc.HeaderFields#add
container-core/src/main/java/com/yahoo/jdisc/http/filter/DiscFilterResponse.java