PhantomJS script for detecting Content-Encoding of JS resources (for httpd diagnosis)

netlog4.js

var page = require('webpage').create(),
    system = require('system'),
    address;

if (system.args.length === 1) {
    console.log('Usage: netlog4.js <some URL>');
    phantom.exit(1);
} else {
    address = system.args[1];

    page.onResourceRequested = function (req) {

    };

    page.onResourceReceived = function (res) {

		if ( String(res.contentType).indexOf('javascript') >= 0 ) {
			var condition = false;
			console.log(res.url);
			res.headers.forEach( function(a,b) {
				if (a.name.indexOf('Encoding') >= 0) {
					console.log(a.value);
					if (a.value.indexOf('gzip') = -1 ) {
						console.log(JSON.stringify(res));
					}
				}
			});
			console.log('Condition');
		};

    };

    page.open(address, function (status) {
        if (status !== 'success') {
            console.log('FAIL to load the address');
        }
        phantom.exit();
    });
}