From: Shing Wai Chan <shing.wai.chan_at_oracle.com>
Date: Thu, 21 Mar 2013 11:19:02 -0700

Currently, there is no mention of default async timeout.
The issue was discussed and closed in Servlet 3.0 EG. The default should
be 30000L.
However, this has never made it to the spec or javadoc of Servlet 3.1.
We plan to add this it to javadoc of ServletRequest#setAsyncTimeout (as
suggested in Servlet 3.1 EG discussion).
Please let me know if you have any concern.

Thanks.
      Shing Wai Chan