Sub-request using Parent Request Body

[agentzh]

On Wed, Jan 5, 2011 at 8:20 AM, Roman Vasilyev <roman at anchorfree.com> wrote:
>
> Let me show one variant of nginx.conf's:
>  location / {
>    include proxy.conf;
>    eval_subrequest_in_memory off;
>    eval_override_content_type text/plain;
>    eval $res {
>      include spam_fastcgi.conf;
>      if ( $request_method = POST) {
>        fastcgi_pass   unix:/var/run/nginx/cgiwrap-dispatch.sock;
>      }
>    }
>   if ( $res = SPAM) {
>     rewrite ^ /terms-of-use.html redirect;
>   }
>  }

Please try the following:

    location = /check-spam {
        internal;

        include spam_fastcgi.conf;
        fastcgi_pass unix:/var/run/nginx/cgiwrap-dispatch.sock;
    }

    location / {
        client_max_body_size 100k;
        client_body_buffer_size 100k;

        lua_need_request_body on;

        rewrite_by_lua '
            if ngx.var.request_method ~= "POST" then
                return
            end
            local res = ngx.location.capture(
                "/check-spam",
                { method = "POST", body = ngx.var.request_body }
            )
            if res.body == "SPAM" then
                return ngx.redirect("/terms-of-use.html")
            end
        ';

        # ... your normal fastcgi_pass/proxy_pass/etc settings
        #   go here ...
    }

Please note that you need the git HEAD of the "master" branch of the
ngx_lua git repos:

     https://github.com/chaoslawful/lua-nginx-module

> I have some foreign spam analyzer which I'm running like fastcgi server
> written in perl.
> I tried to use $request_body as fastsgi_param arg, it was empty;
> Wrote module which creates $post_body var in rewrite stage and with echo
> $post_body it works, but on subrequest it gives empty body (I guess because
> it not passing POST into subrequest)
> maybe somebody have any ideas how to realize it other way, or may be how to
> get POST in subrequest?
>

If you have further issues, feel free to report here ;)

Happy nginx.conf hacking!
-agentzh