first poe program - request for review

hi,
i just finished writing my first poe program, and since i learn best by
hearing/reading about what did i do wrong, or what can be done better -
i would like to ask you for a review, and pointing about everything that
can be done better/nicer/more "poe-ish".

program itself can be found in here:
http://svn.depesz.com/svn/mud-proxy/mud-proxy.pl
if you'd like to run it to test what it does, you will also need test
server: http://svn.depesz.com/svn/mud-proxy/test-server.pl (this is not
poe based, it's just a simple tcp server).

mud-proxy.pl is supposed to work as a proxy between http client, which
sends request every-so-often, and some remote server which uses
stateful connections.

when new client connects using http, mud-proxy starts new connection to
server, arranges things in such a way, that any input from server will
be put in buffers associated with http-client cookie.

Example usage:
in 1st terminal, you run ./test-server.pl
in 2nd terminal, you run ./mud-proxy.pl
in 3rd terminal, you run: 
=> wget --keep-session-cookies --load-cookies=/tmp/cook --save-cookies=/tmp/cook -q http://127.0.0.1:8181/mud -O -
it will print something like this:
{
   "id" : "fKrV4QQgz8EczKlOxgFMQgGQfHJCCGGTnL1nYWwb1JaUbBbIVm",
   "data" : null
}

data: null means that there was no data from server. which is fine.

now you run the command again:

=> wget --keep-session-cookies --load-cookies=/tmp/cook --save-cookies=/tmp/cook -q http://127.0.0.1:8181/mud -O -
{
   "id" : "fKrV4QQgz8EczKlOxgFMQgGQfHJCCGGTnL1nYWwb1JaUbBbIVm",
   "data" : "Give me smaller number: "
}

and it returned some data from server. server asks for smaller number, so i pass: cmd=2:

=> wget --keep-session-cookies --load-cookies=/tmp/cook --save-cookies=/tmp/cook -q http://127.0.0.1:8181/mud?cmd=2 -O -
{
   "id" : "fKrV4QQgz8EczKlOxgFMQgGQfHJCCGGTnL1nYWwb1JaUbBbIVm",
   "data" : null
}

and i ask for new data again:

=> wget --keep-session-cookies --load-cookies=/tmp/cook --save-cookies=/tmp/cook -q http://127.0.0.1:8181/mud -O -
{
   "id" : "fKrV4QQgz8EczKlOxgFMQgGQfHJCCGGTnL1nYWwb1JaUbBbIVm",
   "data" : "And larger: "
}

now it asks for larger integer, so:

=> wget --keep-session-cookies --load-cookies=/tmp/cook --save-cookies=/tmp/cook -q http://127.0.0.1:8181/mud?cmd=10 -O -
{
   "id" : "fKrV4QQgz8EczKlOxgFMQgGQfHJCCGGTnL1nYWwb1JaUbBbIVm",
   "data" : null
}

no, I check the status every so often, and get something like this:

=> wget --keep-session-cookies --load-cookies=/tmp/cook --save-cookies=/tmp/cook -q http://127.0.0.1:8181/mud -O -
{
   "id" : "fKrV4QQgz8EczKlOxgFMQgGQfHJCCGGTnL1nYWwb1JaUbBbIVm",
   "data" : "XX: 2\nXX: 3\nXX: 4\nXX: 5\nXX: 6\n"
}
=> wget --keep-session-cookies --load-cookies=/tmp/cook --save-cookies=/tmp/cook -q http://127.0.0.1:8181/mud -O -
{
   "id" : "fKrV4QQgz8EczKlOxgFMQgGQfHJCCGGTnL1nYWwb1JaUbBbIVm",
   "data" : "XX: 7\nXX: 8\nXX: 9\n"
}
=> wget --keep-session-cookies --load-cookies=/tmp/cook --save-cookies=/tmp/cook -q http://127.0.0.1:8181/mud -O -
{
   "id" : "fKrV4QQgz8EczKlOxgFMQgGQfHJCCGGTnL1nYWwb1JaUbBbIVm",
   "data" : null
}
=> wget --keep-session-cookies --load-cookies=/tmp/cook --save-cookies=/tmp/cook -q http://127.0.0.1:8181/mud -O -
{
   "error" : "Disconnected",
   "id" : "fKrV4QQgz8EczKlOxgFMQgGQfHJCCGGTnL1nYWwb1JaUbBbIVm",
   "data" : "XX: 10\r\n"
}

As you can see stateless http client was able to communicate with stateful tcp
server, exchange data and basically "just work with it".

of course - since my test-server.pl is is synchronous and
single-threaded, we can't really see the asynchroneous nature of poe,
but this is just simplistic example - theoretically you can make
mud-proxy.pl connect to any tcp server, and it should work.

So, back to my original request - if you have some spare time, please check the
sources of mud-proxy.pl, and tell me what, and why, should i have done differently.

Best regards,

depesz

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