From ee3f72b9d1a35a48998710dfbf62fa136170da6d Mon Sep 17 00:00:00 2001
From: "Rico Sta. Cruz" <rstacruz@users.noreply.github.com>
Date: Fri, 3 Jun 2016 19:34:43 +0800
Subject: [PATCH] Update fetch()

---
 js-fetch.md | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/js-fetch.md b/js-fetch.md
index 93b90d7e9..b5b7b1c06 100644
--- a/js-fetch.md
+++ b/js-fetch.md
@@ -37,11 +37,34 @@ fetch('/data.json', {
 
   headers: {
     'Accept': 'application/json'
-  }
+  },
+
+  credentials: 'same-origin', // send cookies
+  credentials: 'include',     // send cookies, even in CORS
+
 })
 ```
 
-##
+### Catching errors
+
+Non-2xx responses are still successful requests. Use another function to turn them to errors.
+
+```js
+fetch('/data.json')
+  .then(checkStatus)
+```
+
+```js
+function checkStatus (res) {
+  if (res.status >= 200 && res.status < 300) {
+    return res
+  } else {
+    var err = new Error(response.statusText)
+    err.response = response
+    throw err
+  }
+}
+```
 
 ## Using with node.js