"proxy_redirect default" may not be used if a proxy_pass uses variables

src/http/modules/ngx_http_proxy_module.c

diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 7cb1cb8..23e1fe1 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -2754,6 +2754,13 @@
     }
 
     if (ngx_strcmp(value[1].data, "default") == 0) {
+        if (plcf->proxy_lengths) {
+            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                               "\"proxy_redirect default\" may not be used "
+                               "with \"proxy_pass\" directive with variables");
+            return NGX_CONF_ERROR;
+        }
+
         if (plcf->url.data == NULL) {
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                "\"proxy_redirect default\" must go "