nginx1.0.15 stable, cut off a 16k js static file into 2.03k

[chenmin7249]

problem solved:
the problem is due to that a new file (16k) replaced the old one
(2.03k), and the cache only refreshed the file content, but not the file
size, so if the file cache is not expired, client may get the right file
but the wrong size, which cause the file to be truncated.
thx B.R, again

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,227254,227258#msg-227258