From d47b1ea3bfbd89bf7f3c65bced56c3e0f5b0b80c Mon Sep 17 00:00:00 2001
From: BlahGeek <i@BlahGeek.com>
Date: Thu, 13 Aug 2015 17:58:54 +0800
Subject: [PATCH] allow fetch callback to alter url

---
 instantclick.js | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/instantclick.js b/instantclick.js
index efac759..5f3a31b 100644
--- a/instantclick.js
+++ b/instantclick.js
@@ -117,6 +117,12 @@ var InstantClick = function(document, location) {
 
           returnValue = altered
         }
+      } else if (eventType == 'fetch') {
+        var new_url = $eventsCallbacks[eventType][i](arg1, arg2, arg3)
+        if (new_url) {
+          arg1 = new_url
+        }
+        returnValue = new_url
       }
       else {
         $eventsCallbacks[eventType][i](arg1, arg2, arg3)
@@ -427,7 +433,10 @@ var InstantClick = function(document, location) {
     $timing = {
       start: +new Date
     }
-    triggerPageEvent('fetch')
+    var new_url = triggerPageEvent('fetch', url)
+    if(new_url) {
+      url = new_url
+    }
     $xhr.open('GET', url)
     $xhr.send()
   }