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Maxim,
On 6/10/15 4:12 AM, Maxim Neshcheret wrote:
> 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);
What does openHttpUrlConnection do?
> *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/);
You should encode the "action" String, too.
> 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/)))
You probably want to use the *actual* encoding of the response.
> {
>
> */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.
>
Are you sending a "Connection" header to the server?
> Is it problem in my client or it can be solved by Java and/or
> Tocmat configuration?
That depends. IIRC, HttpURLConnection used to use KeepAlive *by
default* but that turned out to be a surprise to a lot of people and
caused resource issues. I'm not sure if Sun/Oracle changed their minds
about that and changed the default to be "Connection: close".
I notice that you are *not* calling HttpURLConnection.disconnect(),
which is probably the correct decision given what you'd like to do.
I'd confirm that "Connection: keep-alive" is being used with your
connection, just in case.
- -chris
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