Ruby CGI是否需要重新加载Apache以获取新价值? [英] Ruby cgi needs to reload apache for new value?

问题描述

我在Ubuntu上用apache安装了phusion-passenger.在我的config.ru中，我有以下代码:

I have phusion-passenger installed with apache on Ubuntu. In my config.ru, I have the following code:

require 'cgi'

$tpl = CGI.new['myvar'] + '.rb'

app = proc do |env|
    [200, { "Content-Type" => "text/html" }, [$tpl]]
end
run app

因此，当我通过 http://localhost/?myvar = hello 进入浏览器时，我看到打印出 hello 字样，这很好.然后，将URL更改为 http://localhost/?myvar = world ，但页面仍显示 hello .只有在重新加载apache之后，页面才会显示 world .

So then when I go to my browser at http://localhost/?myvar=hello, I see the word hello printed out, which is fine. Then I change the url to http://localhost/?myvar=world, but the page still shows hello. Only after I reload apache will the page show world.

在使用Phusion-Passenger之前，我在Apache上使用过mod_ruby.如果我没记错的话，我不需要重新启动apache即可获取CGI变量来打印更新后的值.

Before using phusion-passenger, I was using mod_ruby with apache. If I remember correctly, I didn't need to restart apache to get the CGI variable to print the updated value.

我并不需要使用CGI.我只希望能够获取查询字符串参数而不必每次都重新加载apache.

I'm not stuck on needing to use CGI. I just want to be able to grab query string parameters without having to reload apache each time.

我不使用Rails或Sinatra，因为我只是想把我的头缠在Ruby语言上，而使用Apache的phusion-passenger到底是什么.

I'm not using rails or Sinatra because i'm just trying to wrap my head around the Ruby language and what phusion-passenger with apache is all about.

推荐答案

IMO，此行为很有意义.因为 $ tpl 在加载文件时仅设置一次，所以在处理第一个请求时会发生什么.之后-在以下请求中-仅调用 proc ，但这不再更改 $ tpl .

IMO this behavior makes sense. Because $tpl is set only once when the file is loaded, what happens when the first request is served. After that - in following requests - only the proc is called, but that does not change $tpl anymore.

我将使用一个非常简单的 Rack 应用程序来做到这一点，而不是使用普通的 CGI :

Instead of using plain CGI, I would do it with a very simple Rack app:

require 'rack'
require 'rack/server'

class Server
  def self.call(env)
    req = Rack::Request.new(env)
    tpl = "#{req.params['myvar']}.rb"
    [200, {}, [tpl]]
  end
end

run Server

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