网上的解决方案是:Using Aria2 in a separate container (https://github.com/P3TERX/docker-aria2-pro) and changing the host in ocdownloader/controller/lib/aria2.php:
self:
Server = 'http://aria2:6800/jsonrpc';
works like a charm.
他的解决方案貌似就是修改host主机ocdownloader/controller/lib/aria2.php的这个文件,把原来的改为self:
Server = 'http://aria2:6800/jsonrpc'; 但是照做了,没有成功。