REST API: Always add index.php to the REST URL when pretty permalinks are disabled.

When pretty permalinks are disabled, the web server will internally forward requests to `index.php`. Unfortunately, nginx only forwards HTTP/1.0 methods: `PUT`, `PATCH`, and `DELETE` methods will return a 405 error.

To work around this nginx behaviour, including `index.php` in the REST URL skips the internal redirect.

Fixes #40886.



git-svn-id: https://develop.svn.wordpress.org/trunk@41139 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/rest-api/rest-request.php

@@ -547,7 +547,7 @@ class Tests_REST_Request extends WP_UnitTestCase {
 			),
 			array(
 				'permalink_structure' => '',
-				'original_url'        => 'http://' . WP_TESTS_DOMAIN . '/?rest_route=%2Fwp%2Fv2%2Fposts%2F1&foo=bar',
+				'original_url'        => 'http://' . WP_TESTS_DOMAIN . '/index.php?rest_route=%2Fwp%2Fv2%2Fposts%2F1&foo=bar',
 			),
 		);
 	}