CODEWITHSUNDEEP
javaapachehttptcp
baratali
baratali

Reputation: 443

Apache HttpClient TCP Keep-Alive (socket keep-alive)

I have http request that takes too much time to be processed by the server (about 5 minutes). Because connection becomes idle for 5 minutes, proxy server shutdowns the connection. I'm trying to use TCP Keep-Alive in Apache DefaultHttpClient to make connection be alive for a long time (Not confuse TCP Keep-Alive with HTTP Keep-Alive that simply doesn't closes connection after response is sent).

Apache http core has following parameter SO_KEEPALIVE: http://hc.apache.org/httpcomponents-core-ga/httpcore/apidocs/org/apache/http/params/CoreConnectionPNames.html#SO_KEEPALIVE. However, due to DefaultHttpClient javadocs I can't customize client's behavior with that parameter: https://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/impl/client/DefaultHttpClient.html.

I did this, however, seems it doesn't work:

HttpClient client = getHttpClient();
client.getParams().setParameter(CoreConnectionPNames.SO_KEEPALIVE, true);

Do you know how to make DefaultHttpClient use TCP Keep-Alive strategy?

Upvotes: 4

Views: 7709

Answers (1)

baratali
baratali

Reputation: 443

To make it work I needed to set keepalive timeouts. But they can be set only on OS level, not in Java code. As I know, it's not possible to set keepalive timeouts in Java code.

Here is how I set them on Linux: 

sudo sysctl -w net.ipv4.tcp_keepalive_time=60
sudo sysctl -w net.ipv4.tcp_keepalive_intvl=60
sudo sysctl -w net.ipv4.tcp_keepalive_probes=10

Value is amount of seconds.

Upvotes: 5

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