{"id": "performance:performance-hashed-urls", "page": "performance", "ref": "performance-hashed-urls", "title": "datasette-hashed-urls", "content": "If you open a database file in immutable mode using the  -i  option, you can be assured that the content of that database will not change for the lifetime of the Datasette server. \n             The  datasette-hashed-urls plugin  implements an optimization where your database is served with part of the SHA-256 hash of the database contents baked into the URL. \n             A database at  /fixtures  will instead be served at  /fixtures-aa7318b , and a year-long cache expiry header will be returned with those pages. \n             This will then be cached by both browsers and caching proxies such as Cloudflare or Fastly, providing a potentially significant performance boost. \n             To install the plugin, run the following: \n             datasette install datasette-hashed-urls \n             \n                 Prior to Datasette 0.61 hashed URL mode was a core Datasette feature, enabled using the  hash_urls  setting. This implementation has now been removed in favor of the  datasette-hashed-urls  plugin. \n                 Prior to Datasette 0.28 hashed URL mode was the default behaviour for Datasette, since all database files were assumed to be immutable and unchanging. From 0.28 onwards the default has been to treat database files as mutable unless explicitly configured otherwise.", "breadcrumbs": "[\"Performance and caching\"]", "references": "[{\"href\": \"https://datasette.io/plugins/datasette-hashed-urls\", \"label\": \"datasette-hashed-urls plugin\"}]"}