infochanged

Workers - Request.signal will be enabled by default in Workers on November 17

Announced: 2026-11-02
Effective: 2026-11-17
Tags: Workers
Severity: info, set by reef/rss-rule-v1
Source: https://developers.cloudflare.com/changelog/post/2026-11-02-request-signal-default/

Starting November 17, 2026, Workers with a <a href="https://developers.cloudflare.com/workers/configuration/compatibility-dates/">compatibility date</a> of <code>2026-11-17</code> or later will receive client disconnection events through <code>request.signal</code> by default. Use these events to stop unnecessary work when a client leaves. You will no longer need the <code>enable_request_signal</code> compatibility flag for these dates. We <a href="https://developers.cloudflare.com/changelog/post/2025-05-22-handle-request-cancellation/">introduced this feature in May 2025</a>. You can log cancellations, clean up resources, or cancel operations that accept an <code>AbortSignal</code>. For example, this Worker logs a client disconnection and cancels an outgoing request: <div><div data-nb-tabs data-nb-sync-key="workersExamples" class><div class="relative flex border-b border-border" role="tablist" data-nb-tabs-list></div><div class="mt-3"><div role="tabpanel" data-nb-tabs-content data-nb-tab-label="JavaScript" class><figure class="nb-code-figure nb-code-figure-titled" data-nb-lang="js"><figcaption class="nb-code-title" data-pagefind-ignore="">src/index.jsjs</figcaption><pre class="astro-code astro-code-themes github-light github-dark nb-shiki-c6xiwz" tabindex="0" data-language="js" data-nb-lang="js"><code>export default { async fetch(request) { request.signal.addEventListener( "abort", () => { console.log("Client disconnected"); }, { once: true }, ); return fetch("https://example.com/slow-response", { signal: request.signal, }); }, };</code></pre></figure></div><div role="tabpanel" data-nb-tabs-content data-nb-tab-label="TypeScript" class><figure class="nb-code-figure nb-code-figure-titled" data-nb-lang="ts"><figcaption class="nb-code-title" data-pagefind-ignore="">src/index.tsts</figcaption><pre class="astro-code astro-code-themes github-light github-dark nb-shiki-c6xiwz" tabindex="0" data-language="ts" data-nb-lang="ts"><code>export default { async fetch(request): Promise<Response> { request.signal.addEventListener( "abort", () => { console.log("Client disconnected"); }, { once: true }, ); return fetch("https://example.com/slow-response", { signal: request.signal, }); }, } satisfies ExportedHandler;</code></pre></figure></div></div></div><script type="module" src="https://developers.cloudflare.com/home/runner/work/cloudflare-docs/cloudflare-docs/src/components/ui/tabs/Tabs.astro?astro&type=script&index=0&lang.ts"></script></div> Existing Workers keep their current behavior until you change their compatibility date or flags. To try this feature before November 17, keep your current date and add <code>enable_request_signal</code> to your <a href="https://developers.cloudflare.com/workers/configuration/compatibility-flags/">compatibility flags</a>. With a compatibility date of <code>2026-11-17</code> or later, add <code>disable_request_signal</code> to opt out. This change does not enable <code>request_signal_passthrough</code>. Pass the signal explicitly, as the example does. For more information, refer to the <a href="https://developers.cloudflare.com/workers/runtime-apis/request/#properties">Request API</a> and the <a href="https://developers.cloudflare.com/workers/configuration/compatibility-flags/#enable-requestsignal-for-incoming-requests">Request.signal compatibility flag</a>.

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