Problem request_timeout not working with proxy_next_upstream on proxy_connect_timeout but proxy_read_timeout

[yvlasov]

For beter understanding here is my config sniper

upstream super_upstream {
        keepalive 128;
        server be1 max_fails=45 fail_timeout=3s;
        server be2 max_fails=45 fail_timeout=3s;
        server be3 max_fails=45 fail_timeout=3s;
	}

server {
server_name pytn.ru;
location ^~ /simple_requests {
 proxy_read_timeout 2s;
 proxy_send_timeout 2s;
 proxy_connect_timeout 10ms;
 proxy_next_upstream     error timeout invalid_header http_500 http_502
http_503 http_504;
 proxy_pass http://super_upstream;
}

location ^~ /very_heavy_requests {
 send_timeout 60s;
 proxy_read_timeout 60s;
 proxy_send_timeout 60s;
 proxy_connect_timeout 5ms;
 proxy_next_upstream timeout;
 proxy_pass http://super_upstream;
}

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,236982,236983#msg-236983