Proxy server, local fileserve refactoring

index.js

var localFiles = {
    "/js/working.js": "local/working.js"
};

function server (httpRequest, httpResponse) {
    var filename = localFiles[httpRequest.url];
    if (filename) {
        serveLocalFile(httpRequest, httpResponse, filename);
    } else {
        serveViaProxy(httpRequest, httpResponse);
    }
};