Index: httplib.py
===================================================================
--- httplib.py	(revision 67204)
+++ httplib.py	(working copy)
@@ -616,7 +616,7 @@
         while amt > 0:
             chunk = self.fp.read(min(amt, MAXAMOUNT))
             if not chunk:
-                raise IncompleteRead(s)
+                raise IncompleteRead(''.join(s),amt)
             s.append(chunk)
             amt -= len(chunk)
         return ''.join(s)
@@ -1130,9 +1130,20 @@
     pass
 
 class IncompleteRead(HTTPException):
-    def __init__(self, partial):
+    def __init__(self, partial, expected=None):
         self.args = partial,
         self.partial = partial
+        self.expected = expected
+    def __repr__(self):
+        if self.expected is not None:
+            e = ', %i more expected' % self.expected
+        else:
+            e = ''
+        return 'IncompleteRead(%i bytes read%s)' % (
+            len(self.partial),
+            e
+            )
+    __str__=__repr__
 
 class ImproperConnectionState(HTTPException):
     pass
Index: test/test_httplib.py
===================================================================
--- test/test_httplib.py	(revision 67204)
+++ test/test_httplib.py	(working copy)
@@ -181,6 +181,8 @@
                 resp.read()
             except httplib.IncompleteRead, i:
                 self.assertEquals(i.partial, 'hello world')
+                self.assertEqual(repr(i),'IncompleteRead(11 bytes read)')
+                self.assertEqual(str(i),'IncompleteRead(11 bytes read)')
             else:
                 self.fail('IncompleteRead expected')
             finally:
@@ -193,7 +195,24 @@
         self.assertEquals(resp.read(), 'Hello\r\n')
         resp.close()
 
+    def test_incomplete_read(self):
+        sock = FakeSocket('HTTP/1.1 200 OK\r\nContent-Length: 10\r\n\r\nHello\r\n')
+        resp = httplib.HTTPResponse(sock, method="GET")
+        resp.begin()
+        try:
+            resp.read()
+        except httplib.IncompleteRead, i:
+            self.assertEquals(i.partial, 'Hello\r\n')
+            print i
+            self.assertEqual(repr(i),"IncompleteRead(7 bytes read, 3 more expected)")
+            self.assertEqual(str(i),"IncompleteRead(7 bytes read, 3 more expected)")
+        else:
+            self.fail('IncompleteRead expected')
+        finally:
+            resp.close()
+        resp.close()
 
+
 class OfflineTest(TestCase):
     def test_responses(self):
         self.assertEquals(httplib.responses[httplib.NOT_FOUND], "Not Found")