| C | ↗ | A | Client improved |
| ⇢ | B | Middleware::set_curl_options() added | |
| ⇢ | A | Middleware::create_curl_handler() added | |
| ⇢ | A | Middleware::handle_media() added | |
| B | ↛ | Client::set_curl_options() removed | |
| A | ↛ | Client::create_curl_handler() removed | |
| A | ↛ | Client::handle_media() removed |