diff -r cd4b593bbffd Lib/http/client.py
--- a/Lib/http/client.py	Fri Jun 20 07:39:02 2014 -0700
+++ b/Lib/http/client.py	Fri Jun 20 07:47:38 2014 -0700
@@ -72,6 +72,7 @@
 import os
 import socket
 import collections
+from mmap import PAGESIZE
 from urllib.parse import urlsplit
 
 __all__ = ["HTTPResponse", "HTTPConnection",
@@ -926,7 +927,6 @@
 
         if self.debuglevel > 0:
             print("send:", repr(data))
-        blocksize = 8192
         if hasattr(data, "read") :
             if self.debuglevel > 0:
                 print("sendIng a read()able")
@@ -943,7 +943,7 @@
                     if self.debuglevel > 0:
                         print("encoding file using iso-8859-1")
             while 1:
-                datablock = data.read(blocksize)
+                datablock = data.read(PAGESIZE)
                 if not datablock:
                     break
                 if encode: