Merge of r4948, r4949, r4964, r4973, r5011: variables. *) Allow the complex value to be defined as an empty string. This makes conversion from strings to complex values possible without the loss of functionality. *) The "auth_basic" directive gained support of variables. *) Fixed variable syntax checking in "set", "geo", "limit_conn_zone", and "perl_set" directives. *) Added checks that disallow adding a variable with an empty name. Added variable name syntax checks to "geo" and "map" directives. *) Variables $pipe, $request_length, $time_iso8601, and $time_local. Log module counterparts are preserved for efficiency. Based on patch by Kiril Kalchev.

--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -4544,7 +4544,7 @@ ngx_http_core_error_page(ngx_conf_t *cf,
 
     ngx_str_null(&args);
 
-    if (cv.lengths == NULL && uri.data[0] == '/') {
+    if (cv.lengths == NULL && uri.len && uri.data[0] == '/') {
         p = (u_char *) ngx_strchr(uri.data, '?');
 
         if (p) {