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assets_navigation_prefers_asset_serving compat flag that was enabled by default on April 1st. Now, if requests include the Sec-Fetch-Mode: navigate header, which happens on page navigation, and in SPA mode, the index.html404.html is served, instead of the Worker being invoked. await (await fetch('/api/hello')).json(), you'll see the expected response, and the Worker get invoked.JJassets_navigation_has_no_effect to your compatibility_flags
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fetchreturn new Response(null, { status: 404 });JJSJJJassets_navigation_prefers_asset_serving behaviour
Gassets_navigation_has_no_effect flag if you wish to opt out. For most people though, we expect this change to be a welcome one. In traditional SPA setups, this will reduce the number of billable requests that you see in your application, without affecting functionality.GGJfetchwrangler/api/foo vs when they fetchwrangler dev
GET /api/foo - Received Sec-Fetch-Mode: navigate, serving <> or words to that effect, it'd help a lot with the confusion.
IGassets.not_found_handling is something other than “none”, that fallback is served (index.html for SPA, 404.html for 404-page).env.ASSETS.fetch(request) will likely no longer be necessary in most applications. They can now just return 404s or whatever.env.ASSETS.fetch(request), a response according to assets.not_found_handling is returned.GGG
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BSJ404.html traverses up to find one, but index.html
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PPassets_navigation_prefers_asset_servingassets_navigation_prefers_asset_servingSec-Fetch-Mode: navigate404.html404.htmlawait (await fetch('/api/hello')).json()assets_navigation_has_no_effectassets_navigation_has_no_effectcompatibility_flagsYou can configure and override this default routing behaviour. For example, if you have a Single Page Application and want to serve index.html for all unmatched routes, you can set not_found_handling = "single-page-application":app.use('*',...)return new Response(null, { status: 404 });/api/fooGET /api/foo - Received Sec-Fetch-Mode: navigate, serving <>assets.not_found_handlingassets.not_found_handlingenv.ASSETS.fetch(request)env.ASSETS.fetch(request)