如何确定是否从命令行或作为cgi脚本调用脚本？ [英] How can I determine if a script was called from the command line or as a cgi script?

问题描述

我有一个我写的脚本，可以在命令行中使用或作为一个CGI脚本，并需要确定如何调用该脚本，以便我可以输出一个内容类型的头部的Web请求（也许一些反缓存头）。我的第一个想法是检查http环境变量的存在：

I have a script that I wrote that can either be used on the command line or as a CGI script, and need to determine how the script was called so I can output a content-type header for web requests (and maybe some anti-cache headers too). My first thought is to check for the existance of http environment variables:

my $js = build_javascript();

if ( exists $ENV{HTTP_HOST} ) {
   print "Content-type: text/javascript\n\n";
}
print $js;

推荐答案

< >解决方案

解决方案

根据 RFC3875 中的CGI规范（第4.1节.4。），GATEWAY_INTERFACE环境变量将是检查你是否在CGI上下文中运行的权威的东西：

According to the CGI specification in RFC3875 (section 4.1.4.), the GATEWAY_INTERFACE environment variable would be the authoritative thing to check whether you are running in a CGI context:

4.1.4 。 GATEWAY_INTERFACE

GATEWAY_INTERFACE 变量必须设置为方言CGI
被服务器用来与脚本通信。

4.1.4. GATEWAY_INTERFACE

The GATEWAY_INTERFACE variable MUST be set to the dialect of CGI being used by the server to communicate with the script.

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