Igor Sysoev Wrote:
-------------------------------------------------------
> On Thu, May 27, 2010 at 02:55:57AM -0400, 4everpan
> wrote:
>
> > I found in Nginx that:
> > struct ngx_http_request_s {
> > ...
> > ngx_http_request_t *main;
> > ...
> > };
> > what does this argument mean?
> >
> > I also found a similar argument in Apache:
> > request_rec* request_rec::main
> > //Pointer to the main request if this is a
> sub-request (see http_request.h)
> >
> > so,
> > Do they have the same meaning?
> > and if yes, what dose a main request and a
> sub-request mean? What's the difference between
> the 2 http requests?
>
> Yes, this is the same as in Apache.
> Subrequests are requests made inside a request,
> for example, in SSI:
>
> <!--# include virtual="/header.html" -->
>
>
> --
> Igor Sysoev
> http://sysoev.ru/en/
>
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It's really a surprise for me that Igor Sysoev answered my first question in our forum! \(^o^)/~

But I'm not familiar with SSI or shtml protocal... So... let me think about it:
When I enter the URL "http://www.g.cn" into IE, the URL will be redirected to "http://www.google.cn" such as follows:

Started Time Sent Received Method Result Type URL
+ 0.000 0.134 406 532 GET 301 Redirect to http://www.google.cn/webhp?source=g_cn http://www.g.cn/

Dose the GET of URL"http://www.google.cn/webhp?source=g_cn" is a sub-request of the GET of URL"http://www.g.cn/"?