record http post content to log file.
1.parameters
-h show help
-d dir of log file to store,default current dir ./
-p port to listen , default 8010
2.access
http post "content" to url http://IP:port/xxxx
"content" will be store in {logDir}/xxxx-{day}.log
3."xxxx" must match [0-9a-zA-Z_-]+ and max length is 30