Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.605
diff -u -p -r1.605 common.inc
--- includes/common.inc	2 Jan 2007 05:05:38 -0000	1.605
+++ includes/common.inc	2 Jan 2007 19:15:12 -0000
@@ -460,6 +460,10 @@ function drupal_http_request($url, $head
   if ($data) {
     $request .= $data ."\r\n";
   }
+  else {
+    // Send at least one character of data; don't change content-length though.
+    $request .= " \r\n";
+  }
   $result->request = $request;
 
   fwrite($fp, $request);