diff --git a/lib/request.js b/lib/request.js
index 7b8b733..7dba0d9 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -36,6 +36,7 @@ var Request = module.exports = function (xhr, params) {
     };
 
     self._headers = {};
+    self._headerNames = {};
     
     if (params.headers) {
         var keys = objectKeys(params.headers);
@@ -78,6 +79,7 @@ inherits(Request, Stream);
 
 Request.prototype.setHeader = function (key, value) {
     this._headers[key.toLowerCase()] = value
+    this._headerNames[key.toLowerCase()] = key;
 };
 
 Request.prototype.getHeader = function (key) {
@@ -86,6 +88,7 @@ Request.prototype.getHeader = function (key) {
 
 Request.prototype.removeHeader = function (key) {
     delete this._headers[key.toLowerCase()]
+    delete this._headerNames[key.toLowerCase()]
 };
 
 Request.prototype.write = function (s) {
@@ -105,12 +108,13 @@ Request.prototype.end = function (s) {
     for (var i = 0; i < keys.length; i++) {
         var key = keys[i];
         var value = this._headers[key];
+        var name = this._headerNames[key];
         if (isArray(value)) {
             for (var j = 0; j < value.length; j++) {
-                this.xhr.setRequestHeader(key, value[j]);
+                this.xhr.setRequestHeader(name, value[j]);
             }
         }
-        else this.xhr.setRequestHeader(key, value)
+        else this.xhr.setRequestHeader(name, value)
     }
 
     if (this.body.length === 0) {
diff --git a/test/request_url.js b/test/request_url.js
index 1f58f2d..57adefd 100644
--- a/test/request_url.js
+++ b/test/request_url.js
@@ -9,6 +9,7 @@ var noop = function() {};
 global.XMLHttpRequest = function() {
   this.open = noop;
   this.send = noop;
+  this.setRequestHeader = noop;
 };
 
 global.FormData = function () {};
@@ -112,3 +113,32 @@ test('Test POST XHR2 types', function(t) {
   };
   request.end(new global.FormData());
 });
+
+test('Test header access is case insensitive, but is still sent in given case', function (t) {
+  t.plan(3);
+
+  var Request = require('../lib/request');
+  var headers = {};
+  var xhr = function () {
+    this.open = noop;
+    this.send = noop;
+    this.setRequestHeader = function (key, value) {
+      headers[key] = value;
+    };
+  };
+
+  var params = {
+    path: '/api/foo',
+    host: 'localhost',
+    scheme: 'http',
+    headers: { Foo: 'bar' }
+  };
+  var request = new Request(new xhr, params);
+  request.end();
+
+  t.ok(request.getHeader('foo') === params.headers.Foo, 'headers should be accessible regardless of case');
+  t.ok(headers['Foo'] === params.headers.Foo, 'the original header casing should be sent in the request');
+  
+  request.removeHeader('foo');
+  t.ok(request.getHeader('Foo') === undefined, 'headers should be removable regardless of case');
+});