diff --git a/plotly/plotly/chunked_requests/chunked_request.py b/plotly/plotly/chunked_requests/chunked_request.py
index ac8375b4a05..3cf74c45822 100644
--- a/plotly/plotly/chunked_requests/chunked_request.py
+++ b/plotly/plotly/chunked_requests/chunked_request.py
@@ -4,7 +4,7 @@
 
 
 class Stream:
-    def __init__(self, server, port=80, headers={}):
+    def __init__(self, server, port=80, headers={}, url='/'):
         ''' Initialize a stream object and an HTTP Connection
         with chunked Transfer-Encoding to server:port with optional headers.
         '''
@@ -15,6 +15,7 @@ def __init__(self, server, port=80, headers={}):
         self._server = server
         self._port = port
         self._headers = headers
+        self._url = url
         self._connect()
 
     def write(self, data, reconnect_on=('', 200, )):
@@ -60,8 +61,10 @@ def write(self, data, reconnect_on=('', 200, )):
             msg = data
             msglen = format(len(msg), 'x')  # msg length in hex
             # Send the message in chunk-encoded form
+            self._conn.sock.setblocking(1)
             self._conn.send('{msglen}\r\n{msg}\r\n'
                             .format(msglen=msglen, msg=msg).encode('utf-8'))
+            self._conn.sock.setblocking(0)
         except http_client.socket.error:
             self._reconnect()
             self.write(data)
@@ -75,7 +78,7 @@ def _connect(self):
         headers = self._headers
         self._conn = http_client.HTTPConnection(server, port)
 
-        self._conn.putrequest('POST', '/')
+        self._conn.putrequest('POST', self._url)
         self._conn.putheader('Transfer-Encoding', 'chunked')
         for header in headers:
             self._conn.putheader(header, headers[header])
diff --git a/plotly/version.py b/plotly/version.py
index a3145652457..14895e4f956 100644
--- a/plotly/version.py
+++ b/plotly/version.py
@@ -1 +1 @@
-__version__ = '1.4.11'
+__version__ = '1.4.12'
diff --git a/submodules/chunked_requests b/submodules/chunked_requests
index 6595c0aff56..14a6b3fa789 160000
--- a/submodules/chunked_requests
+++ b/submodules/chunked_requests
@@ -1 +1 @@
-Subproject commit 6595c0aff56a79ffae062d08620365373c9b92ab
+Subproject commit 14a6b3fa789ce5ee6c32d80d6ebbba1a6aa689f1