kidager · August 29, 2015 14:18 · May 3, 2015 · Jul 13, 2012 · Jul 13, 2012 · Jul 12, 2012
diff --git a/gistfile1.js → xhr.promise.js b/gistfile1.js → xhr.promise.js
diff --git a/gistfile1.js b/gistfile1.js
@@ -15,7 +15,7 @@ function xhr(options) {
     }
 
     if([200,304].indexOf(req.status) === -1) {
-      deferred.reject(new Error('Server responded with a status of ' + req.status);
+      deferred.reject(new Error('Server responded with a status of ' + req.status));
     } else {
       deferred.resolve(e.target.result);
     }

diff --git a/gistfile1.js b/gistfile1.js
@@ -15,7 +15,7 @@ function xhr(options) {
     }
 
     if([200,304].indexOf(req.status) === -1) {
-      deferred.reject(req.status);
+      deferred.reject(new Error('Server responded with a status of ' + req.status);
     } else {
       deferred.resolve(e.target.result);
     }

diff --git a/gistfile1.js b/gistfile1.js
@@ -21,7 +21,7 @@ function xhr(options) {
     }
   };
 
-  req.send(options.data);
+  req.send(options.data || void 0);
 
   return deferred.promise;
 }
diff --git a/gistfile1.js b/gistfile1.js
@@ -1,6 +1,6 @@
 function xhr(options) {
   var deferred = Q.defer(),
-       req = new XMLHttpRequest();
+      req = new XMLHttpRequest();
 
   req.open(options.method || 'GET', options.url, true);
 

diff --git a/gistfile1.js b/gistfile1.js
@@ -0,0 +1,27 @@
+function xhr(options) {
+  var deferred = Q.defer(),
+       req = new XMLHttpRequest();
+
+  req.open(options.method || 'GET', options.url, true);
+
+  // Set request headers if provided.
+  Object.keys(options.headers || {}).forEach(function (key) {
+    req.setRequestHeader(key, options.headers[key]);
+  });
+
+  req.onreadystatechange = function(e) {
+    if(req.readyState !== 4) {
+      return;
+    }
+
+    if([200,304].indexOf(req.status) === -1) {
+      deferred.reject(req.status);
+    } else {
+      deferred.resolve(e.target.result);
+    }
+  };
+
+  req.send(options.data);
+
+  return deferred.promise;
+}