How does nginx know about FastCGI's stderr?

[任晓磊]

On Mon, Mar 15, 2010 at 5:49 PM, Maxim Dounin <mdounin at mdounin.ru> wrote:
> http://www.fastcgi.com/devkit/doc/fcgi-spec.html
Thank you, Maxim. The document above tells me the detail. I thought
the protocol is a couple of stdio pipes before read this.

So, could you tell me why I see 502 when something in FastCGI's
stderr? Does texts from FastCGI's stderr lead to 502 ? But the specs
says they're just application-level errors.

-- 
Ren Xiaolei