better-route: ETag conditional reads

Use ETags on read routes to let clients revalidate a representation. They do not prevent duplicate writes; use idempotency for that.

use BetterRoute\Middleware\Cache\ETagMiddleware;

$router->get('/catalog', $handler)
    ->publicRoute()
    ->middleware([new ETagMiddleware()]);

The default validator is a quoted SHA-1 of the JSON-encoded response body. It applies only to GET/HEAD results with status 200–299 except 204.

1.1 behavior

The middleware preserves Better Route Response and WP_REST_Response status/data. It adds the ETag through the appropriate response API instead of flattening the WordPress response.

It skips: