where are variables defined?

[Maxim Dounin]

Hello!

On Fri, Oct 23, 2009 at 12:56:00PM +0800, Boern wrote:

> Hi,all:
> I am newbie for nginx,and I have read the nginx English site article
> about modules and configure,but I have a question that there are lots
> of variables used in nginx.conf  and I cann`t find where that`s
> defined ,like this:

Variables are defined by modules, and usually documented as a 
separate section in module documentation.

> ---------------------------------------------------------------------------------------
> fastcgi_param  QUERY_STRING       $query_string;
> fastcgi_param  REQUEST_METHOD     $request_method;
> fastcgi_param  CONTENT_TYPE       $content_type;
> fastcgi_param  CONTENT_LENGTH     $content_length;

http://wiki.nginx.org/NginxHttpCoreModule#variables

> fastcgi_param  SCRIPT_NAME        $fastcgi_script_name;

http://wiki.nginx.org/NginxHttpFcgiModule#variables

> fastcgi_param  REQUEST_URI        $request_uri;
> fastcgi_param  DOCUMENT_URI       $document_uri;
> fastcgi_param  DOCUMENT_ROOT      $document_root;
> fastcgi_param  SERVER_PROTOCOL    $server_protocol;

Again,

http://wiki.nginx.org/NginxHttpCoreModule#variables

> fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
> fastcgi_param  SERVER_SOFTWARE    nginx/$nginx_version;

Defined by ngx_http_core_module, but not really documented.

> fastcgi_param  REMOTE_ADDR        $remote_addr;
> fastcgi_param  REMOTE_PORT        $remote_port;
> fastcgi_param  SERVER_ADDR        $server_addr;
> fastcgi_param  SERVER_PORT        $server_port;
> fastcgi_param  SERVER_NAME        $server_name;

Again,

http://wiki.nginx.org/NginxHttpCoreModule#variables

> ------------------------------------------------------------------------------------------------------
> so,andbody can explain that? maybe the offical site needs has a
> complete document !

You mean something like http://wiki.nginx.org/NginxDirectiveIndex, 
but for variables?  May be it make sence.  Feel free to build one. 
:)

Maxim Dounin