diff --git a/fastcore/net.py b/fastcore/net.py
index f523182b..15578974 100644
--- a/fastcore/net.py
+++ b/fastcore/net.py
@@ -46,7 +46,9 @@ def urlquote(url):
 # Cell
 def urlwrap(url, data=None, headers=None):
     "Wrap `url` in a urllib `Request` with `urlquote`"
-    return url if isinstance(url,Request) else Request(urlquote(url), data=data, headers=headers or {})
+    headers=headers or {}
+    headers['User-agent'] = _ua
+    return url if isinstance(url,Request) else Request(urlquote(url), data=data, headers=headers)
 
 # Cell
 ExceptionsHTTP = {}
@@ -62,8 +64,8 @@ class HTTP5xxServerError(HTTPError):
     pass
 
 # Cell
-_opener = urllib.request.build_opener()
-_opener.addheaders = [('User-agent', _ua)]
+# _opener = urllib.request.build_opener()
+# _opener.addheaders = [('User-agent', _ua)]
 
 _httperrors = (
     (400,'Bad Request'),(401,'Unauthorized'),(402,'Payment Required'),(403,'Forbidden'),(404,'Not Found'),
@@ -90,7 +92,7 @@ def urlopen(url, data=None, headers=None, **kwargs):
     if data is not None:
         if not isinstance(data, (str,bytes)): data = urlencode(data)
         if not isinstance(data, bytes): data = data.encode('ascii')
-    return _opener.open(urlwrap(url, data=data, headers=headers))
+    return urllib.request.urlopen(urlwrap(url, data=data, headers=headers))
 
 # Cell
 def urlread(url, data=None, headers=None, **kwargs):
diff --git a/nbs/03_xtras.ipynb b/nbs/03_xtras.ipynb
index 874d1bb8..147f1918 100644
--- a/nbs/03_xtras.ipynb
+++ b/nbs/03_xtras.ipynb
@@ -1608,7 +1608,7 @@
       "Converted 01_basics.ipynb.\n",
       "Converted 02_foundation.ipynb.\n",
       "Converted 03_xtras.ipynb.\n",
-      "Converted 03a.ipynb.\n",
+      "Converted 03a_parallel.ipynb.\n",
       "Converted 03b_net.ipynb.\n",
       "Converted 04_dispatch.ipynb.\n",
       "Converted 05_transform.ipynb.\n",
diff --git a/nbs/03b_net.ipynb b/nbs/03b_net.ipynb
index d0335317..359a34ad 100644
--- a/nbs/03b_net.ipynb
+++ b/nbs/03b_net.ipynb
@@ -129,7 +129,9 @@
     "#export\n",
     "def urlwrap(url, data=None, headers=None):\n",
     "    \"Wrap `url` in a urllib `Request` with `urlquote`\"\n",
-    "    return url if isinstance(url,Request) else Request(urlquote(url), data=data, headers=headers or {})"
+    "    headers=headers or {}\n",
+    "    headers['User-agent'] = _ua\n",
+    "    return url if isinstance(url,Request) else Request(urlquote(url), data=data, headers=headers)"
    ]
   },
   {
@@ -225,8 +227,8 @@
    "outputs": [],
    "source": [
     "#export\n",
-    "_opener = urllib.request.build_opener()\n",
-    "_opener.addheaders = [('User-agent', _ua)]\n",
+    "# _opener = urllib.request.build_opener()\n",
+    "# _opener.addheaders = [('User-agent', _ua)]\n",
     "\n",
     "_httperrors = (\n",
     "    (400,'Bad Request'),(401,'Unauthorized'),(402,'Payment Required'),(403,'Forbidden'),(404,'Not Found'),\n",
@@ -267,7 +269,7 @@
     "    if data is not None:\n",
     "        if not isinstance(data, (str,bytes)): data = urlencode(data)\n",
     "        if not isinstance(data, bytes): data = data.encode('ascii')\n",
-    "    return _opener.open(urlwrap(url, data=data, headers=headers))"
+    "    return urllib.request.urlopen(urlwrap(url, data=data, headers=headers))"
    ]
   },
   {