Lighttpd

According to the FastCGI Specification:

If an application has no errors to report, it sends either no FCGI_STDERR records or one zero-length FCGI_STDERR record.

See section 6.1 Role Protocols - http://www.fastcgi.com/devkit/doc/fcgi-spec.html

mod_fastcgi.c will emit an empty error message in this case:

(mod_fastcgi.c.2536) FastCGI-stderr:

Instead it should not emit any message. I believe this is as simple as adding:

if (packet.len == 0) break;

just below "case FCGI_SERVER:" on line 2535. "case FCGI_STDOUT" deals with zero-length packets in this manner.

-- jay