diff --git a/README.md b/README.md
index 44526ba..96dffe5 100644
--- a/README.md
+++ b/README.md
@@ -116,6 +116,13 @@ Offline.options = {checks: {image: {url: 'my-image.gif'}, active: 'image'}}
 The one cavet is that with the image method, we can't distinguish a 404 from a genuine connection issue, so any error at all will
 appear to Offline as a connection issue.
 
+By default, Offline will add a 'cacheBust' parameter to the xhr or image URL to prevent the browser from caching the request.
+You can disable this by setting the value to false:
+
+```javascript
+Offline.options = {checks: {xhr: {url: '/connection-test'}, cacheBust:false}};
+```
+
 Offline also includes a check called `'up'` and another called `'down'` which will always report being up or down respectively for
 testing.  You can activate them by setting the `active` option, adding a data attribute to your script tag with the name
 `data-simulate` and value `'up'` or `'down'`, or by setting `localStorage.OFFLINE_SIMULATE` to `'up'` or `'down'`.
diff --git a/coffee/offline.coffee b/coffee/offline.coffee
index e1f4e3a..08be4f1 100644
--- a/coffee/offline.coffee
+++ b/coffee/offline.coffee
@@ -20,16 +20,18 @@ defaultOptions =
     xhr:
       url: ->
         # This can be any endpoint, even one that will 404.
-        "/favicon.ico?_=#{ (new Date()).getTime() }"
+        "/favicon.ico"
       timeout: 5000
       type: 'HEAD'
     image:
       url: ->
         # This can be any image, this is the better option if your image is on a different domain, otherwise just use XHR
-        "/favicon.ico?_=#{ (new Date()).getTime() }"
+        "/favicon.ico"
 
     active: 'xhr'
 
+    cacheBust: true
+
   checkOnLoad: false
 
   interceptRequests: true
@@ -38,6 +40,7 @@ defaultOptions =
 
   deDupBody: false
 
+
 grab = (obj, key) ->
   cur = obj
   parts = key.split('.')
@@ -156,6 +159,16 @@ checkXHR = (xhr, onUp, onDown) ->
 
       _onreadystatechange?(arguments...)
 
+getURL = (url) ->
+  if Offline.getOption('checks.cacheBust')
+    bust = 'cacheBust' + '=' + (new Date).getTime()
+    if url.indexOf('?') > -1
+      bust = '&' + bust
+    else
+      bust = '?' + bust
+    url = url + bust
+  url
+
 Offline.checks = {}
 Offline.checks.xhr = ->
   xhr = new XMLHttpRequest
@@ -164,7 +177,8 @@ Offline.checks.xhr = ->
 
   # It doesn't matter what this hits, even a 404 is considered up.  It is important however that
   # it's on the same domain and port, so CORS issues don't come into play.
-  xhr.open(Offline.getOption('checks.xhr.type'), Offline.getOption('checks.xhr.url'), true)
+
+  xhr.open(Offline.getOption('checks.xhr.type'), getURL(Offline.getOption('checks.xhr.url')), true)
 
   if xhr.timeout?
     xhr.timeout = Offline.getOption('checks.xhr.timeout')
@@ -183,7 +197,7 @@ Offline.checks.image = ->
   img = document.createElement 'img'
   img.onerror = Offline.markDown
   img.onload = Offline.markUp
-  img.src = Offline.getOption('checks.image.url')
+  img.src = getURL(Offline.getOption('checks.image.url'))
 
   undefined
 
diff --git a/js/offline.js b/js/offline.js
index d82d9d5..4ca07da 100644
--- a/js/offline.js
+++ b/js/offline.js
@@ -1,5 +1,5 @@
 (function() {
-  var Offline, checkXHR, defaultOptions, extendNative, grab, handlers, init;
+  var Offline, checkXHR, defaultOptions, extendNative, getURL, grab, handlers, init;
 
   extendNative = function(to, from) {
     var e, key, results, val;
@@ -29,17 +29,18 @@
     checks: {
       xhr: {
         url: function() {
-          return "/favicon.ico?_=" + ((new Date()).getTime());
+          return "/favicon.ico";
         },
         timeout: 5000,
         type: 'HEAD'
       },
       image: {
         url: function() {
-          return "/favicon.ico?_=" + ((new Date()).getTime());
+          return "/favicon.ico";
         }
       },
-      active: 'xhr'
+      active: 'xhr',
+      cacheBust: true
     },
     checkOnLoad: false,
     interceptRequests: true,
@@ -200,13 +201,27 @@
     }
   };
 
+  getURL = function(url) {
+    var bust;
+    if (Offline.getOption('checks.cacheBust')) {
+      bust = 'cacheBust' + '=' + (new Date).getTime();
+      if (url.indexOf('?') > -1) {
+        bust = '&' + bust;
+      } else {
+        bust = '?' + bust;
+      }
+      url = url + bust;
+    }
+    return url;
+  };
+
   Offline.checks = {};
 
   Offline.checks.xhr = function() {
     var e, xhr;
     xhr = new XMLHttpRequest;
     xhr.offline = false;
-    xhr.open(Offline.getOption('checks.xhr.type'), Offline.getOption('checks.xhr.url'), true);
+    xhr.open(Offline.getOption('checks.xhr.type'), getURL(Offline.getOption('checks.xhr.url')), true);
     if (xhr.timeout != null) {
       xhr.timeout = Offline.getOption('checks.xhr.timeout');
     }
@@ -225,7 +240,7 @@
     img = document.createElement('img');
     img.onerror = Offline.markDown;
     img.onload = Offline.markUp;
-    img.src = Offline.getOption('checks.image.url');
+    img.src = getURL(Offline.getOption('checks.image.url'));
     return void 0;
   };
 
diff --git a/offline.js b/offline.js
index 84f4381..dd505f5 100644
--- a/offline.js
+++ b/offline.js
@@ -1,6 +1,6 @@
 /*! offline-js 0.7.14 */
 (function() {
-  var Offline, checkXHR, defaultOptions, extendNative, grab, handlers, init;
+  var Offline, checkXHR, defaultOptions, extendNative, getURL, grab, handlers, init;
   extendNative = function(to, from) {
     var e, key, results, val;
     results = [];
@@ -14,17 +14,18 @@
     checks:{
       xhr:{
         url:function() {
-          return "/favicon.ico?_=" + new Date().getTime();
+          return "/favicon.ico";
         },
         timeout:5e3,
         type:"HEAD"
       },
       image:{
         url:function() {
-          return "/favicon.ico?_=" + new Date().getTime();
+          return "/favicon.ico";
         }
       },
-      active:"xhr"
+      active:"xhr",
+      cacheBust:!0
     },
     checkOnLoad:!1,
     interceptRequests:!0,
@@ -86,9 +87,13 @@
     }) :(_onreadystatechange = xhr.onreadystatechange, xhr.onreadystatechange = function() {
       return 4 === xhr.readyState ? checkStatus() :0 === xhr.readyState && onDown(), "function" == typeof _onreadystatechange ? _onreadystatechange.apply(null, arguments) :void 0;
     });
+  }, getURL = function(url) {
+    var bust;
+    return Offline.getOption("checks.cacheBust") && (bust = "cacheBust=" + new Date().getTime(), 
+    bust = url.indexOf("?") > -1 ? "&" + bust :"?" + bust, url += bust), url;
   }, Offline.checks = {}, Offline.checks.xhr = function() {
     var e, xhr;
-    xhr = new XMLHttpRequest(), xhr.offline = !1, xhr.open(Offline.getOption("checks.xhr.type"), Offline.getOption("checks.xhr.url"), !0), 
+    xhr = new XMLHttpRequest(), xhr.offline = !1, xhr.open(Offline.getOption("checks.xhr.type"), getURL(Offline.getOption("checks.xhr.url")), !0), 
     null != xhr.timeout && (xhr.timeout = Offline.getOption("checks.xhr.timeout")), 
     checkXHR(xhr, Offline.markUp, Offline.markDown);
     try {
@@ -100,7 +105,7 @@
   }, Offline.checks.image = function() {
     var img;
     return img = document.createElement("img"), img.onerror = Offline.markDown, img.onload = Offline.markUp, 
-    void (img.src = Offline.getOption("checks.image.url"));
+    void (img.src = getURL(Offline.getOption("checks.image.url")));
   }, Offline.checks.down = Offline.markDown, Offline.checks.up = Offline.markUp, Offline.check = function() {
     return Offline.trigger("checking"), Offline.checks[Offline.getOption("checks.active")]();
   }, Offline.confirmUp = Offline.confirmDown = Offline.check, Offline.onXHR = function(cb) {
diff --git a/offline.min.js b/offline.min.js
index 2278db3..bca889a 100644
--- a/offline.min.js
+++ b/offline.min.js
@@ -1,2 +1,2 @@
 /*! offline-js 0.7.14 */
-(function(){var a,b,c,d,e,f,g;d=function(a,b){var c,d,e,f;e=[];for(d in b.prototype)try{f=b.prototype[d],null==a[d]&&"function"!=typeof f?e.push(a[d]=f):e.push(void 0)}catch(g){c=g}return e},a={},null==a.options&&(a.options={}),c={checks:{xhr:{url:function(){return"/favicon.ico?_="+(new Date).getTime()},timeout:5e3,type:"HEAD"},image:{url:function(){return"/favicon.ico?_="+(new Date).getTime()}},active:"xhr"},checkOnLoad:!1,interceptRequests:!0,reconnect:!0,deDupBody:!1},e=function(a,b){var c,d,e,f,g,h;for(c=a,h=b.split("."),d=e=0,f=h.length;f>e&&(g=h[d],c=c[g],"object"==typeof c);d=++e);return d===h.length-1?c:void 0},a.getOption=function(b){var d,f;return f=null!=(d=e(a.options,b))?d:e(c,b),"function"==typeof f?f():f},"function"==typeof window.addEventListener&&window.addEventListener("online",function(){return setTimeout(a.confirmUp,100)},!1),"function"==typeof window.addEventListener&&window.addEventListener("offline",function(){return a.confirmDown()},!1),a.state="up",a.markUp=function(){return a.trigger("confirmed-up"),"up"!==a.state?(a.state="up",a.trigger("up")):void 0},a.markDown=function(){return a.trigger("confirmed-down"),"down"!==a.state?(a.state="down",a.trigger("down")):void 0},f={},a.on=function(b,c,d){var e,g,h,i,j;if(g=b.split(" "),g.length>1){for(j=[],h=0,i=g.length;i>h;h++)e=g[h],j.push(a.on(e,c,d));return j}return null==f[b]&&(f[b]=[]),f[b].push([d,c])},a.off=function(a,b){var c,d,e,g,h;if(null!=f[a]){if(b){for(e=0,h=[];e<f[a].length;)g=f[a][e],d=g[0],c=g[1],c===b?h.push(f[a].splice(e,1)):h.push(e++);return h}return f[a]=[]}},a.trigger=function(a){var b,c,d,e,g,h,i;if(null!=f[a]){for(g=f[a],i=[],d=0,e=g.length;e>d;d++)h=g[d],b=h[0],c=h[1],i.push(c.call(b));return i}},b=function(a,b,c){var d,e,f,g,h;return h=function(){return a.status&&a.status<12e3?b():c()},null===a.onprogress?(d=a.onerror,a.onerror=function(){return c(),"function"==typeof d?d.apply(null,arguments):void 0},g=a.ontimeout,a.ontimeout=function(){return c(),"function"==typeof g?g.apply(null,arguments):void 0},e=a.onload,a.onload=function(){return h(),"function"==typeof e?e.apply(null,arguments):void 0}):(f=a.onreadystatechange,a.onreadystatechange=function(){return 4===a.readyState?h():0===a.readyState&&c(),"function"==typeof f?f.apply(null,arguments):void 0})},a.checks={},a.checks.xhr=function(){var c,d;d=new XMLHttpRequest,d.offline=!1,d.open(a.getOption("checks.xhr.type"),a.getOption("checks.xhr.url"),!0),null!=d.timeout&&(d.timeout=a.getOption("checks.xhr.timeout")),b(d,a.markUp,a.markDown);try{d.send()}catch(e){c=e,a.markDown()}return d},a.checks.image=function(){var b;return b=document.createElement("img"),b.onerror=a.markDown,b.onload=a.markUp,void(b.src=a.getOption("checks.image.url"))},a.checks.down=a.markDown,a.checks.up=a.markUp,a.check=function(){return a.trigger("checking"),a.checks[a.getOption("checks.active")]()},a.confirmUp=a.confirmDown=a.check,a.onXHR=function(a){var b,c,e;return e=function(b,c){var d;return d=b.open,b.open=function(e,f,g,h,i){return a({type:e,url:f,async:g,flags:c,user:h,password:i,xhr:b}),d.apply(b,arguments)}},c=window.XMLHttpRequest,window.XMLHttpRequest=function(a){var b,d,f;return f=new c(a),e(f,a),d=f.setRequestHeader,f.headers={},f.setRequestHeader=function(a,b){return f.headers[a]=b,d.call(f,a,b)},b=f.overrideMimeType,f.overrideMimeType=function(a){return f.mimeType=a,b.call(f,a)},f},d(window.XMLHttpRequest,c),null!=window.XDomainRequest?(b=window.XDomainRequest,window.XDomainRequest=function(){var a;return a=new b,e(a),a},d(window.XDomainRequest,b)):void 0},g=function(){return a.getOption("interceptRequests")&&a.onXHR(function(c){var d;return d=c.xhr,d.offline!==!1?b(d,a.markUp,a.confirmDown):void 0}),a.getOption("checkOnLoad")?a.check():void 0},setTimeout(g,0),window.Offline=a}).call(this),function(){var a,b,c,d,e,f,g,h,i;if(!window.Offline)throw new Error("Offline Reconnect brought in without offline.js");d=Offline.reconnect={},f=null,e=function(){var a;return null!=d.state&&"inactive"!==d.state&&Offline.trigger("reconnect:stopped"),d.state="inactive",d.remaining=d.delay=null!=(a=Offline.getOption("reconnect.initialDelay"))?a:3},b=function(){var a,b;return a=null!=(b=Offline.getOption("reconnect.delay"))?b:Math.min(Math.ceil(1.5*d.delay),3600),d.remaining=d.delay=a},g=function(){return"connecting"!==d.state?(d.remaining-=1,Offline.trigger("reconnect:tick"),0===d.remaining?h():void 0):void 0},h=function(){return"waiting"===d.state?(Offline.trigger("reconnect:connecting"),d.state="connecting",Offline.check()):void 0},a=function(){return Offline.getOption("reconnect")?(e(),d.state="waiting",Offline.trigger("reconnect:started"),f=setInterval(g,1e3)):void 0},i=function(){return null!=f&&clearInterval(f),e()},c=function(){return Offline.getOption("reconnect")&&"connecting"===d.state?(Offline.trigger("reconnect:failure"),d.state="waiting",b()):void 0},d.tryNow=h,e(),Offline.on("down",a),Offline.on("confirmed-down",c),Offline.on("up",i)}.call(this),function(){var a,b,c,d,e,f;if(!window.Offline)throw new Error("Requests module brought in without offline.js");c=[],f=!1,d=function(a){return Offline.getOption("requests")!==!1?(Offline.trigger("requests:capture"),"down"!==Offline.state&&(f=!0),c.push(a)):void 0},e=function(a){var b,c,d,e,f,g,h,i,j;if(j=a.xhr,g=a.url,f=a.type,h=a.user,d=a.password,b=a.body,Offline.getOption("requests")!==!1){j.abort(),j.open(f,g,!0,h,d),e=j.headers;for(c in e)i=e[c],j.setRequestHeader(c,i);return j.mimeType&&j.overrideMimeType(j.mimeType),j.send(b)}},a=function(){return c=[]},b=function(){var b,d,f,g,h,i,j;if(Offline.getOption("requests")!==!1){for(Offline.trigger("requests:flush"),i={},d=0,g=c.length;g>d;d++)h=c[d],j=h.url.replace(/(\?|&)_=[0-9]+/,function(a,b){return"?"===b?b:""}),Offline.getOption("deDupBody")?(b=h.body,b="[object Object]"===b.toString()?JSON.stringify(b):b.toString(),i[h.type.toUpperCase()+" - "+j+" - "+b]=h):i[h.type.toUpperCase()+" - "+j]=h;for(f in i)h=i[f],e(h);return a()}},setTimeout(function(){return Offline.getOption("requests")!==!1?(Offline.on("confirmed-up",function(){return f?(f=!1,a()):void 0}),Offline.on("up",b),Offline.on("down",function(){return f=!1}),Offline.onXHR(function(a){var b,c,e,f,g;return g=a.xhr,e=a.async,g.offline!==!1&&(f=function(){return d(a)},c=g.send,g.send=function(b){return a.body=b,c.apply(g,arguments)},e)?null===g.onprogress?(g.addEventListener("error",f,!1),g.addEventListener("timeout",f,!1)):(b=g.onreadystatechange,g.onreadystatechange=function(){return 0===g.readyState?f():4===g.readyState&&(0===g.status||g.status>=12e3)&&f(),"function"==typeof b?b.apply(null,arguments):void 0}):void 0}),Offline.requests={flush:b,clear:a}):void 0},0)}.call(this),function(){var a,b,c,d,e;if(!Offline)throw new Error("Offline simulate brought in without offline.js");for(d=["up","down"],b=0,c=d.length;c>b;b++)e=d[b],(document.querySelector("script[data-simulate='"+e+"']")||("undefined"!=typeof localStorage&&null!==localStorage?localStorage.OFFLINE_SIMULATE:void 0)===e)&&(null==Offline.options&&(Offline.options={}),null==(a=Offline.options).checks&&(a.checks={}),Offline.options.checks.active=e)}.call(this),function(){var a,b,c,d,e,f,g,h,i,j,k,l,m;if(!window.Offline)throw new Error("Offline UI brought in without offline.js");b='<div class="offline-ui"><div class="offline-ui-content"></div></div>',a='<a href class="offline-ui-retry"></a>',f=function(a){var b;return b=document.createElement("div"),b.innerHTML=a,b.children[0]},g=e=null,d=function(a){return k(a),g.className+=" "+a},k=function(a){return g.className=g.className.replace(new RegExp("(^| )"+a.split(" ").join("|")+"( |$)","gi")," ")},i={},h=function(a,b){return d(a),null!=i[a]&&clearTimeout(i[a]),i[a]=setTimeout(function(){return k(a),delete i[a]},1e3*b)},m=function(a){var b,c,d,e;d={day:86400,hour:3600,minute:60,second:1};for(c in d)if(b=d[c],a>=b)return e=Math.floor(a/b),[e,c];return["now",""]},l=function(){var c,h;return g=f(b),document.body.appendChild(g),null!=Offline.reconnect&&Offline.getOption("reconnect")&&(g.appendChild(f(a)),c=g.querySelector(".offline-ui-retry"),h=function(a){return a.preventDefault(),Offline.reconnect.tryNow()},null!=c.addEventListener?c.addEventListener("click",h,!1):c.attachEvent("click",h)),d("offline-ui-"+Offline.state),e=g.querySelector(".offline-ui-content")},j=function(){return l(),Offline.on("up",function(){return k("offline-ui-down"),d("offline-ui-up"),h("offline-ui-up-2s",2),h("offline-ui-up-5s",5)}),Offline.on("down",function(){return k("offline-ui-up"),d("offline-ui-down"),h("offline-ui-down-2s",2),h("offline-ui-down-5s",5)}),Offline.on("reconnect:connecting",function(){return d("offline-ui-connecting"),k("offline-ui-waiting")}),Offline.on("reconnect:tick",function(){var a,b,c;return d("offline-ui-waiting"),k("offline-ui-connecting"),a=m(Offline.reconnect.remaining),b=a[0],c=a[1],e.setAttribute("data-retry-in-value",b),e.setAttribute("data-retry-in-unit",c)}),Offline.on("reconnect:stopped",function(){return k("offline-ui-connecting offline-ui-waiting"),e.setAttribute("data-retry-in-value",null),e.setAttribute("data-retry-in-unit",null)}),Offline.on("reconnect:failure",function(){return h("offline-ui-reconnect-failed-2s",2),h("offline-ui-reconnect-failed-5s",5)}),Offline.on("reconnect:success",function(){return h("offline-ui-reconnect-succeeded-2s",2),h("offline-ui-reconnect-succeeded-5s",5)})},"complete"===document.readyState?j():null!=document.addEventListener?document.addEventListener("DOMContentLoaded",j,!1):(c=document.onreadystatechange,document.onreadystatechange=function(){return"complete"===document.readyState&&j(),"function"==typeof c?c.apply(null,arguments):void 0})}.call(this);
\ No newline at end of file
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