httplib should support requests whose bodies are iterable objects.  This
would facilitate doing large file uploads via HTTP since you wouldn't
have to load the entire file into memory to create the request string.

Index: Lib/httplib.py
===================================================================
--- Lib/httplib.py      (revision 64600)
+++ Lib/httplib.py      (working copy)
@@ -688,7 +688,12 @@
        self.__state = _CS_IDLE

    def send(self, str):
-        """Send `str' to the server."""
+        """Send `str` to the server.
+
+        ``str`` can be a string object, a file-like object that supports
+        a .read() method, or an iterable object that supports a .next()
+        method.
+        """
        if self.sock is None:
            if self.auto_open:
                self.connect()
@@ -710,6 +715,10 @@
                while data:
                    self.sock.sendall(data)
                    data=str.read(blocksize)
+            elif hasattr(str,'next'):
+                if self.debuglevel > 0: print "sendIng an iterable"
+                for data in str:
+                    self.sock.sendall(data)
            else:
                self.sock.sendall(str)
        except socket.error, v: