Changelog

New updates and improvements at Cloudflare.

Workers fetch requests now support cf.vary

Jun 28, 2026

Workers fetch() requests now support the cf.vary request option. Use cf.vary to control how Cloudflare caches origin responses with a Vary header for a single subrequest.

JavaScript
TypeScript

export default {
  async fetch(request) {
    return fetch(request, {
      cf: {
        vary: {
          default: { action: "bypass" },
          headers: {
            accept: {
              action: "normalize",
              media_types: ["text/html", "application/json"],
            },
            "accept-language": {
              action: "normalize",
              languages: ["en", "fr", "de"],
            },
          },
        },
      },
    });
  },
};

export default {
  async fetch(request): Promise<Response> {
    return fetch(request, {
      cf: {
        vary: {
          default: { action: "bypass" },
          headers: {
            accept: {
              action: "normalize",
              media_types: ["text/html", "application/json"],
            },
            "accept-language": {
              action: "normalize",
              languages: ["en", "fr", "de"],
            },
          },
        },
      },
    });
  },
} satisfies ExportedHandler;

For more information, refer to cf.vary.