jadler-core/src/main/java/net/jadler/matchers/HeaderRequestMatcher.java
@Factory
    public static HeaderRequestMatcher requestHeader(final String headerName,
            final Matcher<? super List<String>> pred) {
        return new HeaderRequestMatcher(pred, headerName);
    }
@Factory
    public static HeaderRequestMatcher requestHeader(final String headerName,
            final Matcher<? super List<String>> pred) {
        return new HeaderRequestMatcher(pred, headerName);
    }
Factory method to create new instance of this matcher.
@param headerName name of a request header
@param pred a predicate to be applied on the request header
@return new instance of this matcher