| ⇢ | A | Client added | |
| ⇢ | A | Promise added | |
| A | ↛ | Guzzle6Promise removed | |
| A | ↛ | Guzzle6HttpAdapter removed |
| ⇢ | B | Promise::handleException() added | |
| ⇢ | B | Promise::__construct() added | |
| ⇢ | A | Client::sendAsyncRequest() added | |
| ⇢ | A | Promise::wait() added | |
| ⇢ | A | Client::__construct() added | |
| ⇢ | A | Promise::then() added | |
| ⇢ | A | Promise::getState() added | |
| B | ↛ | Guzzle6Promise::handleException() removed | |
| B | ↛ | Guzzle6Promise::__construct() removed | |
| A | ↛ | Guzzle6Promise::wait() removed | |
| A | ↛ | Guzzle6HttpAdapter::sendAsyncRequest() removed | |
| A | ↛ | Guzzle6HttpAdapter::__construct() removed | |
| A | ↛ | Guzzle6Promise::then() removed | |
| A | ↛ | Guzzle6Promise::getState() removed |