[dev] some questions about subrequests

[Manlio Perillo]

Sergey Bochenkov ha scritto:
> NGX_HTTP_ZERO_IN_URI:
> 
> src/http/ngx_http_core_module.c:
>     sr->zero_in_uri = (flags & NGX_HTTP_ZERO_IN_URI) != 0;
> 
> src/http/ngx_http_request.h:
>     /* URI with "\0" or "%00" */
>     unsigned zero_in_uri:1;
> 
> Obviously, IMHO.
> 

Yes, this was easy!

> 
> NGX_HTTP_SUBREQUEST_IN_MEMORY:
> 
> src/http/ngx_http_core_module.c:
> sr->subrequest_in_memory = (flags & NGX_HTTP_SUBREQUEST_IN_MEMORY) != 0;
> 
> src/http/ngx_http_upstream.c:
>     if (!r->subrequest_in_memory) {
>         ngx_http_upstream_send_response(r, u);
>         return;
>     }
> 
>     /* subrequest content in memory */
> 
>     ...
> 
> So, as I can understand from using-of-subrequests point of view,
> r->subrequest_in_memory flag tells ngx_http_upstream_module to save a
> pointer to the full chain of response buffers in r->upstream->out_bufs
> chain-link. And *not-to-free* that buffers after subrequest was
> finished.
> 
> Fix me, if I'm wrong.
> 

I'm not sure, but it seems that I can safely set flags to 0.


I have one more, important, question.
When will be the post_subrequest->handler called?
Always after ngx_http_subrequest returns?



Thanks  Manlio Perillo