Linux上如何使用Lighttpd+FastCGI部署多个Rails应用

我用ruby构建了公司网站的多个应用，包括中文版，英文版，日文版，各个版本内部不同，所以使用了三个Rails应用进行构建，以前是在windows上运行，apache+mongrel，使用了apache的虚拟主机配置

由于性能问题，移植到了linux上，目前主网站英文运行正常，配置如下：

$HTTP["host"] == "10.10.66.37" {
server.document-root = "/www/use_en/public"
server.error-handler-404 = "/dispatch.fcgi"
fastcgi.server = (".fcgi" =>
    ("localhost" =>
      ("min-procs" => 10,  
       "max-procs" => 10,  
       "socket" => "/tmp/lighttpd/socket/rails.socket",
       "bin-path" => "/www/use_en/public/dispatch.fcgi",
       "bin-environment" => ("RAILS_ENV" => "production")
      )
    )
)
}

中文版的root是/www/use_zh/public，我希望通过http://10.10.66.37/zh的方式进行访问，但增加了这样的设置，启动失败

$HTTP["host"] == "10.10.66.37" {
server.document-root = "/www/use_zh/public"
alias.url = ("/zh" => "/www/use_zh/public")
server.error-handler-404 = "/dispatch.fcgi"
fastcgi.server = (".fcgi" =>
    ("localhost" =>
      ("min-procs" => 10,  
       "max-procs" => 10,  
       "socket" => "/tmp/lighttpd/socket/rails.socket",
       "bin-path" => "/www/use_zh/public/dispatch.fcgi",
       "bin-environment" => ("RAILS_ENV" => "production")
      )
    )
)
}

又在原有的en上增加了alias进行尝试，发现无效
alias.url = ("/en" => "/www/use_en/public")


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