Log Message:
Updated to latest release, 1.4.5, released on 2014-02-11. From CHANGES-1.4:

*) Bugfix: the $ssl_session_id variable contained full session
   serialized instead of just a session id.
   Thanks to Ivan Risti\u0107.

*) Bugfix: client connections might be immediately closed if deferred
   accept was used; the bug had appeared in 1.3.15.

*) Bugfix: alerts "zero size buf in output" might appear in logs while
   proxying; the bug had appeared in 1.3.9.

*) Bugfix: a segmentation fault might occur in a worker process if the
   ngx_http_spdy_module was used.

*) Bugfix: proxied WebSocket connections might hang right after
   handshake if the select, poll, or /dev/poll methods were used.

*) Bugfix: a timeout might occur while reading client request body in an
   SSL connection using chunked transfer encoding.

*) Bugfix: memory leak in nginx/Windows.