Nginx-NGINX老是出现502

Question

日志里很多
2012/12/01 19:18:04 [info] 2204#0: *12746 client prematurely closed connection (104: Connection reset by peer) while sending request to upstream, client: 115.238.231.210, server: www.*****.com, request: "GET /book/2/2458/880800.html HTTP/1.0", upstream: "http://192.168.100.198:80/book/2/2458/880800.html", host: "www.*****.com"
2012/12/01 19:18:13 [info] 2204#0: *12769 writev() failed (104: Connection reset by peer) while sending to client, client: 115.238.231.210, server: www.*****.com, request: "GET /book/24/24506/4190210.html HTTP/1.0", upstream: "http://192.168.100.198:80/book/24/24506/4190210.html", host: "www.*****.com"