diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/rest-api/class-wp-rest-request.php
--- a/wp/wp-includes/rest-api/class-wp-rest-request.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-includes/rest-api/class-wp-rest-request.php	Fri Sep 05 18:52:52 2025 +0200
@@ -162,10 +162,22 @@
 	}
 
 	/**
+	 * Determines if the request is the given method.
+	 *
+	 * @since 6.8.0
+	 *
+	 * @param string $method HTTP method.
+	 * @return bool Whether the request is of the given method.
+	 */
+	public function is_method( $method ) {
+		return $this->get_method() === strtoupper( $method );
+	}
+
+	/**
 	 * Canonicalizes the header name.
 	 *
 	 * Ensures that header names are always treated the same regardless of
-	 * source. Header names are always case insensitive.
+	 * source. Header names are always case-insensitive.
 	 *
 	 * Note that we treat `-` (dashes) and `_` (underscores) as the same
 	 * character, as per header parsing rules in both Apache and nginx.
@@ -482,6 +494,11 @@
 			}
 		}
 
+		// Exclude rest_route if pretty permalinks are not enabled.
+		if ( ! get_option( 'permalink_structure' ) ) {
+			unset( $params['rest_route'] );
+		}
+
 		return $params;
 	}
 
@@ -709,7 +726,7 @@
 	 * Parses the request body parameters.
 	 *
 	 * Parses out URL-encoded bodies for request methods that aren't supported
-	 * natively by PHP. In PHP 5.x, only POST has these parsed automatically.
+	 * natively by PHP.
 	 *
 	 * @since 4.4.0
 	 */