progress流式返回示例
```php
<?php
require_once __DIR__ .",
"Transfer-Encoding" => "chunked",
], ''));
};
Worker::runAll();
```
场景:php作为客户端请求SSE服务端服务端按照官方workerman-sse实现的,[SSE-WORKERMAN](https://www.workerman.net/doc/workerman/http/SSE.html) ,但是progress自定义的函数并未被调用,success定义的函数里一次获取到服务端的多条推送,对此不太理解,求解答