nginx 0.5.20 *) Feature: the "sendfile_max_chunk" directive. *) Feature: the "$http_...", "$sent_http_...", and "$upstream_http_..." variables may be changed using the "set" directive. *) Bugfix: a segmentation fault might occur in worker process if the SSI command 'if expr="$var = /"' was used. *) Bugfix: trailing boundary of multipart range response was transferred incorrectly. Thanks to Evan Miller. *) Bugfix: nginx did not work on Solaris/sparc64 if it was built by Sun Studio. Thanks to Andrei Nigmatulin. *) Bugfix: the ngx_http_perl_module could not built by Solaris make. Thanks to Andrei Nigmatulin.

--- a/src/http/modules/ngx_http_rewrite_module.c
+++ b/src/http/modules/ngx_http_rewrite_module.c
@@ -935,7 +935,11 @@ ngx_http_rewrite_set(ngx_conf_t *cf, ngx
         return NGX_CONF_ERROR;
     }
 
-    if (v->get_handler == NULL) {
+    if (v->get_handler == NULL
+        && ngx_strncasecmp(value[1].data, (u_char *) "http_", 5) != 0
+        && ngx_strncasecmp(value[1].data, (u_char *) "sent_http_", 10) != 0
+        && ngx_strncasecmp(value[1].data, (u_char *) "upstream_http_", 14) != 0)
+    {
         v->get_handler = ngx_http_rewrite_var;
         v->data = index;
     }