Merge remote-tracking branch 'rhettg/master' into work

tornado/simple_httpclient.py

@@ -316,12 +316,20 @@ class _HTTPConnection(object):
         try:
             yield
         except Exception, e:
+            if self.final_callback:
                 gen_log.warning("uncaught exception", exc_info=True)
                 self._run_callback(HTTPResponse(self.request, 599, error=e,
                                     request_time=self.io_loop.time() - self.start_time,
                                     ))
+
                 if hasattr(self, "stream"):
                     self.stream.close()
+            else:
+                # If our callback has already been called, we are probably
+                # catching an exception that is not caused by us but rather
+                # some child of our callback. Rather than drop it on the floor,
+                # pass it along.
+                raise
 
     def _on_close(self):
         if self.final_callback is not None: