| ⇢ | A | HeaderHandler added | |
| ⇢ | A | Header added | |
| ⇢ | A | MustUnderstandHeader added |
| ⇢ | B | HeaderHandler::handleOptions() added | |
| ⇢ | B | HeaderHandler::serializeHeader() added | |
| ⇢ | A | HeaderHandler::getSubscribingMethods() added | |
| ⇢ | A | HeaderHandler::setAttributeOnNode() added | |
| ⇢ | A | Header::__construct() added | |
| ⇢ | A | HeaderHandler::addHeaderData() added | |
| ⇢ | A | Header::getData() added | |
| ⇢ | A | Header::getOptions() added | |
| ⇢ | A | MustUnderstandHeader::__construct() added | |
| ⇢ | A | ClientFactory::setHeaderHandler() added | |
| A | ↘ | B | ClientFactory::getClient() got worse |