--- mod_rewrite.c       (revision 820823)
+++ mod_rewrite.c       (working copy)
@@ -845,7 +845,10 @@
  */
 static void fully_qualify_uri(request_rec *r)
 {
-    if (!is_absolute_uri(r->filename)) {
+    if (r->method_number == M_CONNECT) {
+        return;
+    }
+    else if (!is_absolute_uri(r->filename)) {
         const char *thisserver;
         char *thisport;
         int port;