nginx will return 499 when php is too busy

[kalso k.]

123.150.182.101 - - [24/Apr/2011:00:15:03 +0800] "GET
/plus/qzhlove.php?do=1&t=0.7795113758845088 HTTP/1.1" 499 0
"http://www.qzhlove.com/wenzhang/201119695.html" "-" -

218.29.216.133 - - [24/Apr/2011:00:15:06 +0800] "GET /js/tuijian.php
HTTP/1.1" 499 0 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1;
Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR
3.5.21022; TheWorld)" -


it seems that it's not because client closed the connection but php-cgi,
can I rewrite this error code to 200 or can I request once more.

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