PR63971 expose apr_table_unset for headers/envvars

via nil assignment



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1870650 13f79535-47bb-0310-9956-ffa450edef68

CHANGES

@@ -1,6 +1,10 @@
                                                          -*- coding: utf-8 -*-
 Changes with Apache 2.5.1
 
+  *) mod_lua: Accept nil assignments to the exposed tables (r.subprocess_env, 
+     r.headers_out, etc) to remove the key from the table. PR63971. 
+     [Eric Covener]
+
   *) mod_http2: Fixed interaction with mod_reqtimeout. A loaded mod_http2 was disabling the
      ssl handshake timeouts. Also, fixed a mistake of the last version that made `H2Direct` 
      always `on`, irregardless of configuration. Found and reported by

modules/lua/lua_apr.c

@@ -39,7 +39,13 @@ static int lua_table_set(lua_State *L)
 {
     req_table_t    *t = ap_lua_check_apr_table(L, 1);
     const char     *key = luaL_checkstring(L, 2);
-    const char     *val = luaL_checkstring(L, 3);
+    const char     *val = luaL_optlstring(L, 3, NULL, NULL);
+
+    if (!val) { 
+        apr_table_unset(t->t, key);
+        return 0;
+    }
+
     /* Unless it's the 'notes' table, check for newline chars */
     /* t->r will be NULL in case of the connection notes, but since 
        we aren't going to check anything called 'notes', we can safely