lighttpd mod_fastcgi无法联系正在运行的fcgi服务器

Question

我正在尝试在运行lighttpd的Raspberry Pi上建立一个mediagoblin实例。

我非常关注mediagoblin documentation：我的lighttpd配置文件包含

debug.log-request-handling = "enable"
fastcgi.debug = 1

fastcgi.server += ("/media" =>
  # mnemonical name of the backend
  ( "mg-local" => (
            "host" => "127.0.0.1",
            "port" => "6543",
            "docroot" => "/home/mediagoblin/mediagoblin",
            "check-local" => "disable"
            )
    )
)

mediagoblin实例在端口6543上运行良好（我可以使用任何旧的Web浏览器与其联系）。但是，mod_fastcgi有更多麻烦。以下是尝试访问/var/log/lighttpd/error.log时http://localhost/media的内容：

2018-08-06 12:40:59: (mod_fastcgi.c.3061) got proc: pid: 0 socket: tcp:127.0.0.1:6543 load: 1 
2018-08-06 12:43:12: (mod_fastcgi.c.2569) unexpected end-of-file (perhaps the fastcgi process died): pid: 0 socket: tcp:127.0.0.1:6543 
2018-08-06 12:43:12: (mod_fastcgi.c.3353) response not received, request sent: 1219 on socket: tcp:127.0.0.1:6543 for /media?, closing connection 

如何告诉mod_fastcgi与localhost:6543上正在运行的服务器联系？