Disable keep_alive based on specific useragent

[mex]

nope, this seems to be a longer-known problem:

http://forum.nginx.org/read.php?10,233386,template=head

i (at least) did not got it working, either with "default 300;"
or with

set katimeout 300;

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,254833,254879#msg-254879