NGINX a request is double send to my backend servers

本帖最后由 xiaoone 于 2010-07-14 09:24 编辑

I have a problem  of nginx load balanced .

sometimes a  request is double send  to my backend  servers :2 of apaches ;  
the access_log is being :
219.130.135.6 - - [14/Jul/2010:09:12:41 +0800] POST buyvalidate.php?id=1885028 HTTP/1.1 "200" 766 "http:/host.com/buypro.php?p=a&s=1&id=1885028" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" "-"
219.130.135.6 - - [14/Jul/2010:09:13:42 +0800] POST buyresult.php HTTP/1.1 "200" 60 "http:/host.com/buyvalidate.php?id=1885028" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" "-"lla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" "-"  


the second time request  obain  database  tables unique constraint !

Is checked apcha