Timeout - candidate for spec

fetch.js

@@ -154,6 +154,7 @@
     this.method = normalizeMethod(options.method || 'GET')
     this.mode = options.mode || null
     this.referrer = null
+    this.timeout = options.timeout || null
   }
 
   function decode(body) {
@@ -217,6 +218,10 @@
         })
       })
 
+      if (self.timeout) {
+        xhr.timeout = self.timeout
+      }
+
       xhr.send((self._body === undefined) ? null : self._body)
     })
   }

test/server.js

@@ -56,6 +56,12 @@ var routes = {
     res.writeHead(308, {'Location': '/hello'});
     res.end();
   },
+  '/slow': function(res) {
+    setTimeout(function () {
+      res.writeHead(200, { 'Content-Type': 'text/plain' });
+      res.end('too slow');
+    }, 10);
+  },
   '/boom': function(res) {
     res.writeHead(500, {'Content-Type': 'text/plain'});
     res.end('boom');

test/test.js

@@ -15,6 +15,14 @@ test('rejects promise for network error', function() {
   })
 })
 
+test('rejects promise for timeout', function() {
+  return fetch('/slow', {
+    timeout: 5
+  }).catch(function() {
+    assert(true)
+  })
+})
+
 // https://fetch.spec.whatwg.org/#headers-class
 suite('Headers', function() {
   test('headers are case insensitve', function() {
@@ -42,6 +50,7 @@ suite('Request', function() {
   })
 })
 
+
 // https://fetch.spec.whatwg.org/#response-class
 suite('Response', function() {
   function readBlobAsText(blob) {