npm install grunt-http-server

grunt.initConfig({

	'http-server': {

		'dev': {

			// the server root directory
			root: <path>,

			// the server port
			// can also be written as a function, e.g.
			// port: function() { return 8282; }
			port: 8282,
			

			// the host ip address
			// If specified to, for example, "127.0.0.1" the server will 
			// only be available on that ip.
			// Specify "0.0.0.0" to be available everywhere
			host: "0.0.0.0",

			cache: <sec>,
			showDir : true,
			autoIndex: true,

			// server default file extension
			ext: "html",

			// run in parallel with other tasks
			runInBackground: true|false

		}

	}
});

grunt.loadNpmTasks('grunt-http-server');

grunt http-server:dev