#revalidation

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shadow pilot
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Hey, imagine a set of settings objects, which are fetched and cached. Now these data will be used on a page with export const dynamic = "force-static". What happends, when I now revalidate a single setting (NOT the force-static page)?

lament flickerBOT
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Hi @shadow pilot. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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When you revalidate a single setting, it triggers the process of purging the Data Cache and re-fetching the latest data for that specific setting. This is useful when your data changes and you want to ensure you show the latest information.

In the context of a page with export const dynamic = "force-static", the revalidation of a single setting will not automatically trigger a re-render of the page. The page will continue to serve the statically generated version until a new request is made to the page after the revalidation time has passed.

If you want to manually trigger a revalidation of the page, you can use On-Demand Incremental Static Regeneration (ISR). Starting with v12.2.0, Next.js supports On-Demand ISR to manually purge the Next.js cache for a specific page. This makes it easier to update your site when content from your headless CMS is created or updated. Inside getStaticProps, you do not need to specify revalidate to use on-demand revalidation. If revalidate is omitted, Next.js will use the default value of false (no revalidation) and only revalidate the page on-demand when revalidate() is called.

Please note that Middleware won't be executed for On-Demand ISR requests. Instead, call revalidate() on the exact path that you want revalidated.

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@shadow pilot kapa.ai is still learning and improving, please let us know how it did by reacting below

shadow pilot
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@lament flicker when I have now the draftmode enabled, will I see the changes directly?

lament flickerBOT
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Let me check the knowledge base for you. One moment! :books:

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Yes, when Draft Mode is enabled, you will be able to see the changes directly. Draft Mode in Next.js is designed to allow you to view draft content from your Headless CMS immediately, while still statically generating pages in production.

When Draft Mode is enabled, Next.js bypasses Static Generation and renders these pages at request time, fetching the draft content instead of the published content. This is particularly useful when you're writing a draft on your headless CMS and want to view the draft immediately on your page.

You can toggle Draft Mode in the Vercel Toolbar in production, localhost, and Preview Deployments. When you do so, the toolbar will become purple to indicate Draft Mode is active. Users outside your Vercel team cannot toggle Draft Mode.

Here is an example of how to use the draftMode function to detect Draft Mode inside a Server Component:

import { draftMode } from 'next/headers'
 
export default function Page() {
 const { isEnabled } = draftMode()
 return (
 <main>
 <h1>My Blog Post</h1>
 <p>Draft Mode is currently {isEnabled ? 'Enabled' : 'Disabled'}</p>
 </main>
 )
}

Please note that if your Next.js version is <13.4, the Vercel Toolbar will turn purple when Draft Mode is enabled, but won't be able to toggle it on or off.

Here are the relevant knowledge sources for your reference:

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@shadow pilot kapa.ai is still learning and improving, please let us know how it did by reacting below

shadow pilot
#

@lament flicker does that also works, when I embedded my (force-static) page via an iframe? Like imagine havging the settings cached, the (force-static) page is rendered inside an iframe. Now the setting is revalidated and I have the draftmode enabled. Will the iframe change?

lament flickerBOT
#

Let me check the knowledge base for you. One moment! :books:

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The behavior of Draft Mode with iframes can be a bit complex due to the way cookies are handled. The Draft Mode relies on a cookie (__prerender_bypass) to determine whether to bypass the cache and fetch the latest content. However, cookies may not always be shared across iframes depending on the SameSite attribute of the cookie and the browser's security settings.

In some discussions on GitHub, users have reported issues with Draft Mode when using iframes, particularly with the __prerender_bypass cookie's SameSite attribute being set to Lax instead of None. This can prevent the cookie from being sent when the page is loaded in an iframe, which in turn can prevent Draft Mode from working correctly.

Some users have found workarounds by manually setting the SameSite attribute of the __prerender_bypass cookie to None and Secure to True. Here's an example of how they did it:

const cookies = res.getHeader("Set-Cookie").map((cookie) => {
  if (cookie.match(/^__prerender_bypass=/)) {
    return cookie.replace(/SameSite=Lax/, "SameSite=None; Secure=True");
  }
  return cookie;
});

res.setHeader("Set-Cookie", cookies);

However, please note that this is a workaround and may not work in all cases. It's also worth noting that this behavior might be different in development and production environments.

Here are the relevant knowledge sources for your reference:

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@shadow pilot kapa.ai is still learning and improving, please let us know how it did by reacting below

shadow pilot
#

@lament flicker you said:

In the context of a page with export const dynamic = "force-static", the revalidation of a single setting will not automatically trigger a re-render of the page. The page will continue to serve the statically generated version until a new request is made to the page after the revalidation time has passed.

I tried now to have a setting with a cache and this method (getSettingWithCache) is imported in my force-static version and my editor (with draftMode). When I now invalidate the tag of the cache, also the force-static page will be created new. Why?

lament flickerBOT
#

Let me check the knowledge base for you. One moment! :books:

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The behavior you're observing might be due to the way Next.js handles caching and revalidation. When you invalidate a tag of the cache, it triggers a revalidation process which fetches the latest data for that specific tag. If this tag is used in your force-static page, it could potentially trigger a re-render of the page to reflect the latest data.

However, it's important to note that the force-static option in Next.js is designed to force the page to be statically rendered and cache the data of a layout or page. This means that even if the data changes (i.e., the cache tag is invalidated), the statically rendered page will not automatically update to reflect these changes until a new request is made to the page after the revalidation time has passed.

In Draft Mode, Next.js bypasses static generation and renders these pages at request time. This means that if you're viewing the page in Draft Mode and invalidate a cache tag, you should see the changes immediately upon refreshing the page because the page is being rendered at request time with the latest data.

#

Here are the relevant knowledge sources for your reference:

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@shadow pilot kapa.ai is still learning and improving, please let us know how it did by reacting below

shadow pilot
#

@lament flicker is there any difference between pages router and app router in my case?

lament flickerBOT
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Let me check the knowledge base for you. One moment! :books:

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Yes, there are differences between the Pages Router and the App Router, and these differences could impact your case depending on how you're using Next.js.

The Pages Router was the original router in Next.js and it allowed you to build server-rendered React applications. It used an intuitive file-system router to map each file to a route. The Pages Router is still supported in newer versions of Next.js, but it's recommended to migrate to the new App Router to leverage React's latest features (source (https://nextjs.org/docs/pages)).

The App Router, introduced in Next.js version 13, is built on React Server Components and supports shared layouts, nested routing, loading states, error handling, and more. The App Router works in a new directory named app, which works alongside the pages directory to allow for incremental adoption. This means you can opt some routes of your application into the new behavior while keeping other routes in the pages directory for previous behavior (source (https://nextjs.org/docs/app/building-your-application/routing#the-app-router)).

In the context of your case, if you're using the force-static option, this is specific to the App Router and is not available in the Pages Router. The force-static option forces the page to be statically rendered and cache the data of a layout or page. This means that even if the data changes (i.e., the cache tag is invalidated), the statically rendered page will not automatically update to reflect these changes until a new request is made to the page after the revalidation time has passed.

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In contrast, the Pages Router uses methods like getServerSideProps and getStaticProps for data fetching, which have been replaced with a simpler API in the App Router. The App Router also uses a special page.js file to make a route segment publicly accessible, which is different from the Pages Router (source (https://nextjs.org/docs/app/building-your-application/upgrading/app-router-migration#step-4-migrating-pages)).

So, depending on your specific use case and requirements, you might find one router more suitable than the other.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: