two servers running on same port causes second process to hijack the port #16

on Windows, running two servers on the same port (e.g., run two instance of the simple_http_server example on the same port) causes undefined behavior. The second server should fail.

seems to be related to cpp-netlib's use of SO_REUSEADDR

http://msdn.microsoft.com/en-us/library/ms740621%28VS.85%29.aspx