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----
-'astro': minor
----
-
-Changes the default behavior for Astro Action form requests to a standard POST submission.
-
-In Astro 4.x, actions called from an HTML form would trigger a redirect with the result forwarded using cookies. This caused issues for large form errors and return values that exceeded the 4 KB limit of cookie-based storage.
-
-Astro 5.0 now renders the result of an action as a POST result without any forwarding. This will introduce a "confirm form resubmission?" dialog when a user attempts to refresh the page, though it no longer imposes a 4 KB limit on action return value.
-
-## Customize form submission behavior
-
-If you prefer to address the "confirm form resubmission?" dialog on refresh, or to preserve action results across sessions, you can now [customize action result handling from middleware](https://5-0-0-beta.docs.astro.build/en/guides/actions/#advanced-persist-action-results-with-a-session).
-
-We recommend using a session storage provider [as described in our Netlify Blob example](https://5-0-0-beta.docs.astro.build/en/guides/actions/#advanced-persist-action-results-with-a-session). However, if you prefer the cookie forwarding behavior from 4.X and accept the 4 KB size limit, you can implement the pattern as shown in this sample snippet:
-
-```ts 
-// src/middleware.ts
-import { defineMiddleware } from 'astro:middleware';
-import { getActionContext } from 'astro:actions';
-
-export const onRequest = defineMiddleware(async (context, next) => {
-  // Skip requests for prerendered pages
-  if (context.isPrerendered) return next();
-
-	const { action, setActionResult, serializeActionResult } = getActionContext(context);
-
-	// If an action result was forwarded as a cookie, set the result
-	// to be accessible from `Astro.getActionResult()`
-	const payload = context.cookies.get('ACTION_PAYLOAD');
-	if (payload) {
-		const { actionName, actionResult } = payload.json();
-		setActionResult(actionName, actionResult);
-		context.cookies.delete('ACTION_PAYLOAD');
-		return next();
-	}
-
-	// If an action was called from an HTML form action,
-	// call the action handler and redirect with the result as a cookie.
-	if (action?.calledFrom === 'form') {
-		const actionResult = await action.handler();
-
-		context.cookies.set('ACTION_PAYLOAD', {
-			actionName: action.name,
-			actionResult: serializeActionResult(actionResult),
-		});
-
-		if (actionResult.error) {
-		// Redirect back to the previous page on error
-			const referer = context.request.headers.get('Referer');
-			if (!referer) {
-				throw new Error('Internal: Referer unexpectedly missing from Action POST request.');
-			}
-			return context.redirect(referer);
-		}
-		// Redirect to the destination page on success
-		return context.redirect(context.originPathname);
-	}
-
-	return next();
-})
-```