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我具有与HTTP通信的两个服务器:鉴于客户端代码部分延迟在FIN ACK TCP
PostMethod postMethod = new PostMethod(strURL);
int bodylength=UCIPBodyRequestGen.toStringBodyRequest(_request, DEFAULT_CHARSET).length();
setRequestHeader(postMethod,bodylength);
postMethod.setRequestBody(requestBody);
HttpClient myClient = new HttpClient();
myClient.setConnectionTimeout(mcf.getTimeout());
myClient.setTimeout(mcf.getTimeout());
int statusCode = myClient.executeMethod(postMethod);
responseBody=postMethod.getResponseBodyAsString();
我有在一些请求~500ms
和其他平均稍微延迟是~20ms
TCPDUMP show that the delay is in TCP FIN-ACK
2014-12-23 09:38:59.069230 HTTP/XML 1534 POST /Servlet HTTP/1.1
2014-12-23 09:38:59.070450 HTTP 514 HTTP/1.1 200 OK
2014-12-23 09:38:59.110758 TCP 66 14783?9770 [ACK] Seq=1469 Ack=450 Win=33920 Len=0 TSval=2321949059 TSecr=2321949019
2014-12-23 09:38:59.602623 TCP 66 14783?9770 [FIN, ACK] Seq=1469 Ack=450 Win=33920 Len=0 TSval=2321949551 TSecr=2321949019
关于这个延迟的任何线索?
也许这可以帮助:http://stackoverflow.com/questions/11711218/client-sends-delayed-fin-ack-500ms-to-server – slowy