Why Nginx Doesn't Implement FastCGI Multiplexing?

[momyc]

OK, it probably closes connection to backend server. Well, in case of
multiplexed FastCGI Nginx should do two things:
1) send FCGI_ABORT_REQUEST to backend for given request
2) start dropping records for given request if it still receives records
from backend for given request

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,237158,241051#msg-241051