diff -r a0e8f2d882a3 Lib/test/test_wsgiref.py
--- a/Lib/test/test_wsgiref.py  Mon Jun 30 20:00:03 2014 -0400
+++ b/Lib/test/test_wsgiref.py  Mon Jun 30 21:05:14 2014 -0600
@@ -627,6 +627,22 @@
         h.run(error_app)
         self.assertEqual(side_effects['close_called'], True)
 
+    def testIteratorEmptyPreStart(self):
+        def app(e, s):
+            yield b''
+            s("200 OK", [
+                ("Content-Type", "text/plain; charset=utf-8"),
+            ])
+            yield b'data'
+
+        h = TestHandler()
+        h.run(app)
+        self.assertEqual(b"Status: 200 OK\r\n"
+            b"Content-Type: text/plain; charset=utf-8\r\n"
+            b"\r\n"
+            b"data",
+            h.stdout.getvalue())
+
 
 def test_main():
     support.run_unittest(__name__)
diff -r a0e8f2d882a3 Lib/wsgiref/handlers.py
--- a/Lib/wsgiref/handlers.py   Mon Jun 30 20:00:03 2014 -0400
+++ b/Lib/wsgiref/handlers.py   Mon Jun 30 21:05:14 2014 -0600
@@ -177,7 +177,8 @@
         try:
             if not self.result_is_file() or not self.sendfile():
                 for data in self.result:
-                    self.write(data)
+                    if len(data) > 0:
+                        self.write(data)
                 self.finish_content()
         finally:
             self.close()