Minimal caching pushState link interceptor

interceptor.js

history.pushState && !function() {
    var location = history.location || window.location;

    var cache = (function() {
        var store = {}

        return function(key, data) {
            if (arguments.length == 2) {
                (store[key] = data)

                return key
            }

            return store[key]
        }
    })()

    var fetch = (function() {
        var $content = $('.content')

        return function(path) {
            // Check if we should cache our current content
            if (!cache(location.pathname)) {
                cache(location.pathname, $content.html())
            }

            return $.when(cache(path) || $.get(path).done(function(html) {
                cache(path, html)
            })).done(function(html) {
                $content.html(html)

                _gaq.push(['_trackPageview', path])
            })
        }
    })()

    $(document).on('click', 'a[href^="/"]', function(e) {
        var modifier = e.shiftKey || e.metaKey || e.altKey
        
        if (!modifier) {
            e.preventDefault()

            var path = $(this).attr('href')

            // Don't fetch the same page twice
            if (location.pathname != path) {
                fetch(path).done(function() {
                    history.pushState({path: path}, document.title, location.protocol + '//' + location.host + path)
                })
            }        
        }
    })

    $(window).on('popstate', function(e) {
        e.stopPropagation()

        var state = e.originalEvent.state
        state && fetch(state.path)
    })
}()

history.pushState({path: path}, document.title, location.protocol + '//' + location.host + path)

@devote Thanks, updated with your protocol suggestion.