--- a/server/core.c  2017/09/08 13:10:16 1807753
+++ b/server/core.c  2017/09/08 13:13:11 1807754
@@ -2266,6 +2266,12 @@
             /* method has not been registered yet, but resource restriction
              * is always checked before method handling, so register it.
              */
+            if (cmd->pool == cmd->temp_pool) {
+                /* In .htaccess, we can't globally register new methods. */
+                return apr_psprintf(cmd->pool, "Could not register method '%s' "
+                                   "for %s from .htaccess configuration",
+                                    method, cmd->cmd->name);
+            }
             methnum = ap_method_register(cmd->pool,
                                          apr_pstrdup(cmd->pool, method));
         }