I have java http client which sends periodically (every 30 sec; this code is
run by heartbeat thread in the cycle) heartbeats
private PostResponse post(String jSessionCookie, final String action,
final String data, final int postTimeoutMs) throws IOException, SSYSException
{
final HttpURLConnection httpConn = openHttpUrlConnection(true,
postTimeoutMs, jSessionCookie);
final OutputStream os = httpConn.getOutputStream();
try (final PrintWriter wr = new PrintWriter(
DefaultProperty.isEnableSocketTraceGW ? new TracerOutputStream(os) : os )) {
final String text = "action=" + action + "&data=" + URLEncoder.encode(data,
DefaultProperty.httpEncoding);
wr.write(text);
wr.flush();
final int respCode = httpConn.getResponseCode();
if (respCode != HttpURLConnection.HTTP_OK)
{
String info = "Incorrect response from server,
responseCode:" + respCode + ", message:" + httpConn.getResponseMessage();
log.error(info);
throw new
SSYSException(SSYSCoreEx.ERR_UNKNOWN_ERROR, info);
}
}
if (jSessionCookie == null)
{
jSessionCookie = getJSessionCookie(httpConn);
}
final InputStream inputStream = httpConn.getInputStream();
try (final BufferedReader reader = new BufferedReader(new
InputStreamReader(
(DefaultProperty.isEnableSocketTraceGW ?
new TracerInputStream(inputStream)
:
inputStream
)
, DefaultProperty.httpEncoding)))
{
log.trace("before readline(post)");
String replyText = reader.readLine();
log.trace("after readline(post): [" + replyText + "]");
NReply nReply = PoolGson.fromJson(replyText, NReply.class);
if (nReply == null) {
final String msg = "corrupted reply, action:" +
action;
log.debug(msg);
throw new IOException(msg);
}
return new PostResponse(replyText, nReply, jSessionCookie,
nReply.id);
}
}
On the server side there is Tomcat 8.0.21 + APR connector.
Every time this heartbeat is sent I see in the Wireshark and EtherDetect that
new TCP connection is opened (SYN-SYNACK packets) and after getting response
from Tomcat connection is closed (FIN – FINACK packets).
I was expecting that TCP connections will be reused but not closed.
Is it problem in my client or it can be solved by Java and/or Tocmat
configuration?
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