protected Collection<CookieAttributeHandler> getAttribHandlers() {
        return this.attribHandlerMap.values();
    }
Gets attribute handler {@link CookieAttributeHandler} for the
given attribute.

@param name attribute name. e.g. Domain, Path, etc.
@throws IllegalStateException if handler not found for the
         specified attribute.
httpclient5/src/main/java/org/apache/hc/client5/http/impl/cookie/AbstractCookieSpec.java