Proxy Server

This is a Proxy Server for Node.js submitted as the pre-work requirement for CodePath.

Time spent: [8hrs, including setting up environment, coding, testing, recording using LICEcap]

##Completed:

[done] Required: Requests to port 8000 are echoed back with the same HTTP headers and body
[done] Required: Requests/reponses are proxied to/from the destination server
[done] Required: The destination server is configurable via the --host, --port or --url arguments
[done] Required: The destination server is configurable via the x-destination-url header
[done] Required: Client requests and respones are printed to stdout
[done] Required: The --logfile argument outputs all logs to the file specified instead of stdout
[done] Optional: The --exec argument proxies stdin/stdout to/from the destination program
[todo] Optional: The --loglevel argument sets the logging chattiness
[todo] Optional: Supports HTTPS
[todo] Optional: -h argument prints CLI API

Provide feedback