public Set<String> getNoCacheFields() {
        return noCacheFields;
    }
Returns an unmodifiable set of field names specified in the "no-cache" directive of the Cache-Control header.

@return The set of field names specified in the "no-cache" directive.
httpclient5-cache/src/main/java/org/apache/hc/client5/http/cache/ResponseCacheControl.java