Merge branch 'orphan-black'

Closes #209, fixes #185

fetch.js

@@ -236,6 +236,10 @@
     this._initBody(body)
   }
 
+  Request.prototype.clone = function() {
+    return new Request(this)
+  }
+
   function decode(body) {
     var form = new FormData()
     body.trim().split('&').forEach(function(bytes) {
@@ -279,6 +283,15 @@
 
   Body.call(Response.prototype)
 
+  Response.prototype.clone = function() {
+    return new Response(this._bodyInit, {
+      status: this.status,
+      statusText: this.statusText,
+      headers: new Headers(this.headers),
+      url: this.url
+    })
+  }
+
   Response.error = function() {
     var response = new Response(null, {status: 0, statusText: ''})
     response.type = 'error'

test/test.js

@@ -273,7 +273,7 @@ suite('Request', function() {
     })
   })
 
-  ;(/Chrome\//.test(navigator.userAgent) ? test.skip : test)('construct with used Request body', function() {
+  ;(/Chrome\//.test(navigator.userAgent) && !fetch.polyfill ? test.skip : test)('construct with used Request body', function() {
     var request1 = new Request('https://fetch.spec.whatwg.org/', {
       method: 'post',
       body: 'I work out'
@@ -286,6 +286,36 @@ suite('Request', function() {
     })
   })
 
+  test('clone request', function() {
+    var req = new Request('https://fetch.spec.whatwg.org/', {
+      method: 'post',
+      headers: {'content-type': 'text/plain'},
+      body: 'I work out'
+    })
+    var clone = req.clone()
+
+    assert.equal(clone.method, 'POST')
+    assert.equal(clone.headers.get('content-type'), 'text/plain')
+    assert.notEqual(clone.headers, req.headers)
+
+    return clone.text().then(function(body) {
+      assert.equal(body, 'I work out')
+    })
+  })
+
+  ;(/Chrome\//.test(navigator.userAgent) && !fetch.polyfill ? test.skip : test)('clone with used Request body', function() {
+    var req = new Request('https://fetch.spec.whatwg.org/', {
+      method: 'post',
+      body: 'I work out'
+    })
+
+    return req.text().then(function() {
+      assert.throws(function() {
+        req.clone()
+      }, TypeError)
+    })
+  })
+
   // https://fetch.spec.whatwg.org/#concept-bodyinit-extract
   suite('BodyInit extract', function() {
     ;(Request.prototype.blob ? suite : suite.skip)('type Blob', function() {
@@ -385,6 +415,35 @@ suite('Response', function() {
     })
   })
 
+  test('clone text response', function() {
+    var res = new Response('{"foo":"bar"}', {
+      headers: {'content-type': 'application/json'}
+    })
+    var clone = res.clone()
+
+    assert.notEqual(clone.headers, res.headers, 'headers were cloned')
+    assert.equal(clone.headers.get('content-type'), 'application/json')
+
+    return Promise.all([clone.json(), res.json()]).then(function(jsons){
+      assert.deepEqual(jsons[0], jsons[1], 'json of cloned object is the same as original')
+    })
+  })
+
+  ;(Response.prototype.arrayBuffer ? test : test.skip)('clone blob response', function() {
+    return fetch('/binary').then(function(response) {
+      return Promise.all([response.clone().arrayBuffer(), response.arrayBuffer()]).then(function(bufs){
+        bufs.forEach(function(buf){
+          assert(buf instanceof ArrayBuffer, 'buf is an ArrayBuffer instance')
+          assert.equal(buf.byteLength, 256, 'buf.byteLength is correct')
+          var view = new Uint8Array(buf)
+          for (var i = 0; i < 256; i++) {
+            assert.equal(view[i], i)
+          }
+        })
+      })
+    })
+  })
+
   test('error creates error Response', function() {
     var r = Response.error()
     assert(r instanceof Response)