public boolean containsIgnoreCase(String key, String value) {
        return h.containsIgnoreCase(key, value);
    }
<p>Convenience method for checking whether or not a named header contains a specific value, regardless of case.
If the named header is not set, or if the given value is not contained within that header's value list, this
method returns <em>false</em>.</p>

<p><em>NOTE:</em> This method is case-INSENSITIVE.</p>

@param key   The key whose values to search in.
@param value The values to search for, ignoring case.
@return True if the given value was found in the named header.
@see #contains
application/src/main/java/com/yahoo/application/container/handler/Headers.java