How do I find out what the "system defined" socket timeout and connect timeout are?

The Apache HTTP RequestConfig getSocketTimeout() and getConnectTimeout() both say:

A negative value is interpreted as undefined (system default if applicable).

And they both say the default value is:

Default: -1

So I'm using the default value of -1, but what is the "system default" value? Is there some way I can find this by running a command on my terminal or something?