Pen

Servers can be assigned weights to account for differing
capacities. New penctl commands control the weight of each
server and turn on or off weights for the server selection
algorithm. The code in add_client was simplified so that the
weighted server selection can be used with or without client
tracking.

Several performance enhancing changes allows the load balancer to stand up to very heavy load. Large numbers of connections are handled more efficiently.

Experimental SSL support was added, which allows
the load balancer to accept HTTPS connections and
distribute them to HTTP backend servers.

This release fixes a bug where under certain circumstances where running Pen with the -H option would cause parts of a POST request to be dropped. Another change eliminates long timeouts trying to connect to servers that don't exist.

All calls to setlinebuf were replaced with
setvbuf, for compatibility with HP-UX.