diff --git a/src/http/modules/ngx_http_rewrite_module.c b/src/http/modules/ngx_http_rewrite_module.c
index 5164734..6daf4b7 100644
--- a/src/http/modules/ngx_http_rewrite_module.c
+++ b/src/http/modules/ngx_http_rewrite_module.c
@@ -813,6 +813,11 @@ ngx_http_rewrite_if_condition(ngx_conf_t *cf, ngx_http_rewrite_loc_conf_t *lcf)
             return NGX_CONF_OK;
         }
 
+        if (p[1] == 'z') {
+            fop->op = ngx_http_script_file_empty;
+            return NGX_CONF_OK;
+        }
+
         if (p[0] == '!') {
             if (p[2] == 'f') {
                 fop->op = ngx_http_script_file_not_plain;
@@ -833,6 +838,11 @@ ngx_http_rewrite_if_condition(ngx_conf_t *cf, ngx_http_rewrite_loc_conf_t *lcf)
                 fop->op = ngx_http_script_file_not_exec;
                 return NGX_CONF_OK;
             }
+
+            if (p[2] == 'z') {
+                fop->op = ngx_http_script_file_not_empty;
+                return NGX_CONF_OK;
+            }
         }
 
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
diff --git a/src/http/ngx_http_script.c b/src/http/ngx_http_script.c
index a703f08..4a82b6d 100644
--- a/src/http/ngx_http_script.c
+++ b/src/http/ngx_http_script.c
@@ -1520,12 +1520,14 @@ ngx_http_script_file_code(ngx_http_script_engine_t *e)
         case ngx_http_script_file_dir:
         case ngx_http_script_file_exists:
         case ngx_http_script_file_exec:
+        case ngx_http_script_file_not_empty:
              goto false_value;
 
         case ngx_http_script_file_not_plain:
         case ngx_http_script_file_not_dir:
         case ngx_http_script_file_not_exists:
         case ngx_http_script_file_not_exec:
+        case ngx_http_script_file_empty:
              goto true_value;
         }
 
@@ -1580,6 +1582,18 @@ ngx_http_script_file_code(ngx_http_script_engine_t *e)
             goto false_value;
         }
         goto true_value;
+
+    case ngx_http_script_file_empty:
+        if (of.size == 0) {
+             goto true_value;
+        }
+        goto false_value;
+
+    case ngx_http_script_file_not_empty:
+        if (of.size > 0) {
+            goto false_value;
+        }
+        goto true_value;
     }
 
 false_value:
diff --git a/src/http/ngx_http_script.h b/src/http/ngx_http_script.h
index c5b1e40..7790b53 100644
--- a/src/http/ngx_http_script.h
+++ b/src/http/ngx_http_script.h
@@ -171,7 +171,9 @@ typedef enum {
     ngx_http_script_file_exists,
     ngx_http_script_file_not_exists,
     ngx_http_script_file_exec,
-    ngx_http_script_file_not_exec
+    ngx_http_script_file_not_exec,
+    ngx_http_script_file_empty,
+    ngx_http_script_file_not_empty
 } ngx_http_script_file_op_e;