Possible to determine which FastCGI server responded?

[Davy Campano]

If I have a configuration like this for FastCGI, is it possible to determine
which server responded to the request?  Is there a variable that would tell
this that I can use for nginx's log?
upstream phpservers
{
                server 10.1.1.50:5201;
                server 10.1.1.51:5201;
}

Davy
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