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:

The attached patch implements this for python 2.7.  It also adds support
for iterable bodies in urllib2, where it is more generally useful. 
urllib2 enforces the presence of a Content-Length header in the request
if the body is an iterable, whereas httplib does not.

The patch also includes updates to docs and tests (which all pass as of
r67584 on my macbook)

Seems like a reasonable feature request.  I'm going to apply a variant
of the patch in 3.1 first.