diff --git a/src/raven.js b/src/raven.js
index b246158ada22..1ac443a21e81 100644
--- a/src/raven.js
+++ b/src/raven.js
@@ -81,7 +81,8 @@ function Raven() {
     stackTraceLimit: 50,
     autoBreadcrumbs: true,
     instrument: true,
-    sampleRate: 1
+    sampleRate: 1,
+    preferFetch: false
   };
   this._ignoreOnError = 0;
   this._isRavenInstalled = false;
@@ -1232,7 +1233,7 @@ Raven.prototype = {
         _window,
         'fetch',
         function(origFetch) {
-          return function(fn, t) {
+          return function() {
             // preserve arity
             // Make a copy of the arguments to prevent deoptimization
             // https://github.com/petkaantonov/bluebird/wiki/Optimization-killers#32-leaking-arguments
@@ -1256,6 +1257,11 @@ Raven.prototype = {
               url = '' + fetchInput;
             }
 
+            // if Sentry key appears in URL, don't capture
+            if (url.indexOf(self._globalKey) !== -1) {
+              return origFetch.apply(this, args);
+            }
+
             if (args[1] && args[1].method) {
               method = args[1].method;
             }
@@ -1675,29 +1681,17 @@ Raven.prototype = {
     return true;
   },
 
-  _setBackoffState: function(request) {
+  _setBackoffState: function(status, retry) {
     // If we are already in a backoff state, don't change anything
     if (this._shouldBackoff()) {
       return;
     }
 
-    var status = request.status;
-
     // 400 - project_id doesn't exist or some other fatal
     // 401 - invalid/revoked dsn
     // 429 - too many requests
     if (!(status === 400 || status === 401 || status === 429)) return;
 
-    var retry;
-    try {
-      // If Retry-After is not in Access-Control-Expose-Headers, most
-      // browsers will throw an exception trying to access it
-      retry = request.getResponseHeader('Retry-After');
-      retry = parseInt(retry, 10) * 1000; // Retry-After is returned in seconds
-    } catch (e) {
-      /* eslint no-empty:0 */
-    }
-
     this._backoffDuration = retry
       ? // If Sentry server returned a Retry-After value, use it
         retry
@@ -1867,8 +1861,25 @@ Raven.prototype = {
       onError: function failure(error) {
         self._logDebug('error', 'Raven transport failed to send: ', error);
 
-        if (error.request) {
-          self._setBackoffState(error.request);
+        if (error.xhrRequest || error.fetchResponse) {
+          var retry;
+          var status;
+          if (error.xhrRequest) {
+            status = error.xhrRequest.status;
+            try {
+              // If Retry-After is not in Access-Control-Expose-Headers, most
+              // browsers will throw an exception trying to access it
+              retry = error.xhrRequest.getResponseHeader('Retry-After');
+            } catch (e) {
+              /* eslint no-empty:0 */
+            }
+          } else if (error.fetchResponse) {
+            status = error.fetchResponse.status;
+            if (error.fetchResponse.headers.has('Retry-After')) {
+              retry = error.fetchResponse.headers.get('Retry-After');
+            }
+          }
+          self._setBackoffState(status, retry && parseInt(retry, 10) * 1000);
         }
 
         self._triggerEvent('failure', {
@@ -1882,9 +1893,36 @@ Raven.prototype = {
   },
 
   _makeRequest: function(opts) {
+    var hasFetch = !!(_window.fetch && _window.Request);
+    if (this._globalOptions.preferFetch && hasFetch) {
+      return this._doFetch(opts);
+    }
     var request = _window.XMLHttpRequest && new _window.XMLHttpRequest();
-    if (!request) return;
+    if (request) {
+      return this._doXHR(request, opts);
+    } else if (hasFetch) {
+      return this._doFetch(opts);
+    }
+  },
+
+  _doFetch: function(opts) {
+    _window
+      .fetch(opts.url + '?' + urlencode(opts.auth), {
+        method: 'POST',
+        body: stringify(opts.data)
+      })
+      .then(function(resp) {
+        if (resp.ok) {
+          opts.onSuccess && opts.onSuccess();
+        } else if (opts.onError) {
+          var err = new Error('Sentry error code: ' + resp.status);
+          err.fetchResponse = resp;
+          opts.onError(err);
+        }
+      }, opts.onError);
+  },
 
+  _doXHR: function(request, opts) {
     // if browser doesn't support CORS (e.g. IE7), we are out of luck
     var hasCORS = 'withCredentials' in request || typeof XDomainRequest !== 'undefined';
 
@@ -1900,7 +1938,7 @@ Raven.prototype = {
           opts.onSuccess && opts.onSuccess();
         } else if (opts.onError) {
           var err = new Error('Sentry error code: ' + request.status);
-          err.request = request;
+          err.xhrRequest = request;
           opts.onError(err);
         }
       };
@@ -1917,7 +1955,7 @@ Raven.prototype = {
       if (opts.onError) {
         request.onerror = function() {
           var err = new Error('Sentry error code: XDomainRequest');
-          err.request = request;
+          err.xhrRequest = request;
           opts.onError(err);
         };
       }
diff --git a/test/raven.test.js b/test/raven.test.js
index 486881310d80..db32f24eb734 100644
--- a/test/raven.test.js
+++ b/test/raven.test.js
@@ -1471,7 +1471,7 @@ describe('globals', function() {
       Raven._send({message: 'bar'});
       var opts = Raven._makeRequest.lastCall.args[0];
       var mockError = new Error('429: Too many requests');
-      mockError.request = {
+      mockError.xhrRequest = {
         status: 429
       };
       opts.onError(mockError);
@@ -1502,7 +1502,7 @@ describe('globals', function() {
       Raven._send({message: 'bar'});
       var opts = Raven._makeRequest.lastCall.args[0];
       var mockError = new Error('401: Unauthorized');
-      mockError.request = {
+      mockError.xhrRequest = {
         status: 401,
         getResponseHeader: sinon
           .stub()
@@ -1714,7 +1714,7 @@ describe('globals', function() {
         data: {foo: 'bar'},
         options: Raven._globalOptions,
         onError: function(error) {
-          assert.equal(error.request.status, 429);
+          assert.equal(error.xhrRequest.status, 429);
           done();
         }
       });