low summit
The following server component is supposed to send a new render to the client after 30 seconds but it only sends the previously cached data instead with a 304 HTTP response?
export const dynamic = 'force-static';
export const revalidate = 30
export default async function Page() {
return (
<div>{Date.now()}</div>
)
}
wraith depotBOT
Hi @low summit. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
The issue you're experiencing is due to the dynamic option being set to 'force-static'. This option forces static rendering and caches the data of a layout or page. It causes an error if any components use dynamic functions or uncached data. This is equivalent to using getStaticProps() in the pages directory and setting the option of every fetch() request in a layout or page to { cache: 'force-cache' } (source (https://nextjs.org/docs/app/api-reference/file-conventions/route-segment-config)).
If you want your page to be revalidated every 30 seconds, you should set the dynamic option to 'auto' or 'force-dynamic'. The 'auto' option is the default and it caches as much as possible without preventing any components from opting into dynamic behavior. The 'force-dynamic' option forces dynamic rendering and uncached data fetching of a layout or page by disabling all caching of fetch requests and always revalidating (source (https://nextjs.org/docs/app/api-reference/file-conventions/route-segment-config)).
Here's how you can modify your code:
export const dynamic = 'auto';
export const revalidate = 30
export default async function Page() {
return (
<div>{Date.now()}</div>
)
}
@wraith depot export const dynamic = 'auto'; does not provide any cacheing
wraith depotBOT
Let me check the knowledge base for you. One moment! :books:
The dynamic = 'auto' option in Next.js does provide caching. It is the default option and it is designed to cache as much as possible without preventing any components from opting into dynamic behavior. This means that it will cache any fetch() requests that are reachable before any dynamic functions are used and will not cache fetch requests that are discovered after dynamic functions are used (source (https://nextjs.org/docs/app/api-reference/file-conventions/route-segment-config)).
However, the caching behavior can be overridden by the fetchCache option. The fetchCache option allows you to override the default cache option of all fetch requests in a layout or page. For example, setting fetchCache = 'force-no-store' would ensure all fetch requests opt out of caching by setting the cache option of all fetch requests to 'no-store' (source (https://nextjs.org/docs/app/api-reference/file-conventions/route-segment-config)).
dynamic = 'auto' does provide caching, the actual caching behavior can be influenced by other options and the use of dynamic functions in your components.
low summit
show me an example of Incremental Static Regeneration with app router?
@wraith depot show me an example of Incremental Static Regeneration with app router?
wraith depotBOT
Let me check the knowledge base for you. One moment! :books:
Sure, here's an example of Incremental Static Regeneration (ISR) with the app router. This example uses the fetch function with the revalidate option to cache the request for a specified amount of seconds.
// `app` directory
async function getPosts() {
const res = await fetch(`<https://.../posts`,> { next: { revalidate: 60 } })
const data = await res.json()
return data.posts
}
export default async function PostList() {
const posts = await getPosts()
return posts.map((post) => <div>{post.name}</div>)
}
In this example, the getPosts function fetches posts from a specified URL and sets the revalidate option to 60 seconds. This means that the fetched data will be cached and revalidated every 60 seconds. The PostList function then uses the getPosts function to fetch the posts and render them (source (https://nextjs.org/docs/app/building-your-application/upgrading/app-router-migration)).
<https://.../posts> with your actual API endpoint.
low summit
<@&1089670008898080870> show me an example of full route Incremental Static Regeneration with app router?
low summit
@wraith depot give me an example of the following: export const revalidate = false
wraith depotBOT
Let me check the knowledge base for you. One moment! :books:
Sure, here's an example of using export const revalidate = false in a Next.js server component:
// layout.tsx / page.tsx / route.ts
export const revalidate = false
export default function MyComponent() {
return (
<div>Hello, Next.js!</div>
)
}
revalidate = false means that the default heuristic will be used to cache any fetch requests that set their cache option to 'force-cache' or are discovered before a dynamic function is used. This is semantically equivalent to revalidate: Infinity which effectively means the resource should be cached indefinitely. It is still possible for individual fetch requests to use cache: 'no-store' or revalidate: 0 to avoid being cached and make the route dynamically rendered (source (https://nextjs.org/docs/app/api-reference/file-conventions/route-segment-config)).
low summit
@wraith depot give me an example of the following in a server component: export const revalidate = 30
wraith depotBOT
Let me check the knowledge base for you. One moment! :books:
Sure, here's an example of using export const revalidate = 30 in a Next.js server component:
// layout.tsx / page.tsx / route.ts
export const revalidate = 30
export default function MyComponent() {{
return (
<div>Hello, Next.js!</div>
)
}}
revalidate = 30 means that the default revalidation frequency of a layout or page is set to 30 seconds. This means that the data for this component will be revalidated every 30 seconds, and if there are any changes, the new data will be fetched and the component will be re-rendered on the server (source (https://nextjs.org/docs/app/api-reference/file-conventions/route-segment-config)).
low summit
@wraith depot can you have a dynamic route with data revalidation?
wraith depotBOT
Let me check the knowledge base for you. One moment! :books: