Remove private Request._fetch

fetch.js

@@ -244,12 +244,41 @@
     return head
   }
 
-  Request.prototype._fetch = function() {
-    var self = this
+  Body.call(Request.prototype)
+
+  function Response(bodyInit, options) {
+    if (!options) {
+      options = {}
+    }
+
+    this._initBody(bodyInit)
+    this.type = 'default'
+    this.url = null
+    this.status = options.status
+    this.ok = this.status >= 200 && this.status < 300
+    this.statusText = options.statusText
+    this.headers = options.headers instanceof Headers ? options.headers : new Headers(options.headers)
+    this.url = options.url || ''
+  }
+
+  Body.call(Response.prototype)
+
+  self.Headers = Headers;
+  self.Request = Request;
+  self.Response = Response;
+
+  self.fetch = function(input, init) {
+    // TODO: Request constructor should accept input, init
+    var request
+    if (Request.prototype.isPrototypeOf(input) && !init) {
+      request = input
+    } else {
+      request = new Request(input, init)
+    }
 
     return new Promise(function(resolve, reject) {
       var xhr = new XMLHttpRequest()
-      if (self.credentials === 'cors') {
+      if (request.credentials === 'cors') {
         xhr.withCredentials = true;
       }
 
@@ -286,53 +315,20 @@
         reject(new TypeError('Network request failed'))
       }
 
-      xhr.open(self.method, self.url, true)
+      xhr.open(request.method, request.url, true)
 
       if ('responseType' in xhr && support.blob) {
         xhr.responseType = 'blob'
       }
 
-      self.headers.forEach(function(name, values) {
+      request.headers.forEach(function(name, values) {
         values.forEach(function(value) {
           xhr.setRequestHeader(name, value)
         })
       })
 
-      xhr.send(typeof self._bodyInit === 'undefined' ? null : self._bodyInit)
+      xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit)
     })
   }
-
-  Body.call(Request.prototype)
-
-  function Response(bodyInit, options) {
-    if (!options) {
-      options = {}
-    }
-
-    this._initBody(bodyInit)
-    this.type = 'default'
-    this.url = null
-    this.status = options.status
-    this.ok = this.status >= 200 && this.status < 300
-    this.statusText = options.statusText
-    this.headers = options.headers instanceof Headers ? options.headers : new Headers(options.headers)
-    this.url = options.url || ''
-  }
-
-  Body.call(Response.prototype)
-
-  self.Headers = Headers;
-  self.Request = Request;
-  self.Response = Response;
-
-  self.fetch = function (input, init) {
-    var request
-    if (Request.prototype.isPrototypeOf(input)) {
-      request = input
-    } else {
-      request = new Request(input, init)
-    }
-    return request._fetch()
-  }
   self.fetch.polyfill = true
 })();