#next app router api fetch - cache

1 messages · Page 1 of 1 (latest)

cerulean briar
#

I have

const response = await fetch('http://localhost:3000/api/test', { cache: 'no-store' })

however i think its still caching because when I change the values it doesnt reflect on my console log

fickle badgeBOT
#

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

#

The fetch function in Next.js allows you to control caching behavior using the cache option. If you set cache: 'no-store', Next.js should fetch the resource from the remote server on every request without looking in the cache, and it will not update the cache with the downloaded resource (source (https://nextjs.org/docs/app/api-reference/functions/fetch)).

However, there are certain conditions where requests are not cached:

If you believe that your fetch request is still being cached despite setting cache: 'no-store', you might want to check if any of the above conditions apply to your case.

Also, you can use the fetchCache option in your Next.js application to override the default cache option of all fetch requests in a layout or page. For example, you can set fetchCache to 'force-no-store' to 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)).

Here's how you can do it:

export const fetchCache = 'force-no-store';

Remember, this is an advanced option and should only be used if you specifically need to override the default behavior.

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

#

@cerulean briar kapa.ai is still learning and improving, please let us how it did by reacting below

cerulean briar
#

@fickle badge when I go to the localhost:3000/api/test route that I have it is showing the new json that i have now updated

src/app/api/test
import { NextResponse } from 'next/server'
import { sessionOptions } from '@lib/session'

// eslint-disable-next-line import/prefer-default-export
export async function GET(): Promise<Response> {
console.log('===GET===')
console.log(NextResponse.json({ thisKeyA: 'thisValueA' }))
console.log('====')

console.log('===sessionOptions===')
console.log(sessionOptions)
console.log('====')

return NextResponse.json({ thisKeyB: 'thisValueB', ...sessionOptions, thatKey: 'thatValue' })
}

however

src/app/admin/page.tsx

const Admin = async ({ userId }: { userId: number }) => {
const response = await fetch('http://localhost:3000/api/test', { cache: 'no-store' })
const data = await response.json()
console.log('===data===')
console.log(JSON.stringify(data))
console.log('====')
return (
<>
<h1>Admin</h1>
<span>
User ID:
{userId}
</span>
<p> </p>
<span>
JSON data here:
{JSON.stringify(data)}
</span>
<form method="POST" action="/api/auth/logout">
<button type="submit">Logout</button>
</form>
</>
)
}

export default Admin

is still returning just JSON data here:{"thisKey":"thisValue"} that i had previously but not anymroe

fickle badgeBOT
#

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

#

Based on the information provided, it seems like you're experiencing a caching issue where the old data is being returned instead of the updated data.

In your GET function in src/app/api/test, you're returning a NextResponse.json with the updated data. However, in your Admin component in src/app/admin/page.tsx, you're fetching data from the same endpoint but receiving the old data.

Here are a few things you can check:

  1. Server-side caching: Even though you've set cache: 'no-store' in your fetch request, it's possible that the server or a CDN is still caching the response. Check if your upstream data provider has caching enabled by default. You might need to disable it, otherwise a revalidation won't be able to pull fresh data to update the ISR cache. Caching can occur at a CDN (for an endpoint being requested) when it returns the Cache-Control header. ISR on Vercel persists the cache globally and handles rollbacks (https://vercel.com/docs/concepts/incremental-static-regeneration/overview) (source (https://nextjs.org/docs/app/building-your-application/data-fetching/revalidating)).

  2. Client-side caching: If you're using a service worker or a similar technology on the client side, it might be caching the response. You can check this by inspecting the Network tab in your browser's developer tools and looking at the headers of the fetch request.

  3. Data mutation: If you're using a state management library or React's built-in state, make sure you're not mutating the data directly. Always use the provided methods to update the state.

  4. Asynchronous updates: Remember that updates to state and props in React are asynchronous. If you're logging the data immediately after calling setState or updating a prop, you might still see the old data.

#

If none of these suggestions help, please provide more information about your setup and I'll be glad to assist you further.

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

#

@cerulean briar kapa.ai is still learning and improving, please let us how it did by reacting below

cerulean briar
#

@fickle badge my headers is

Request URL:
http://localhost:3001/admin
Request Method:
GET
Status Code:
200 OK
Remote Address:
[::1]:3001
Referrer Policy:
strict-origin-when-cross-origin
Cache-Control:
no-store, must-revalidate
Connection:
close
Content-Encoding:
gzip
Content-Type:
text/html; charset=utf-8
Date:
Sun, 02 Jul 2023 09:09:52 GMT
Transfer-Encoding:
chunked
Vary:
RSC, Next-Router-State-Tree, Next-Router-Prefetch, Accept-Encoding
X-Powered-By:
Next.js
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.7
Accept-Encoding:
gzip, deflate, br
Accept-Language:
en-US,en;q=0.9
Cache-Control:
no-cache
Connection:
keep-alive
Host:
localhost:3001
Pragma:
no-cache
Sec-Ch-Ua:
"Not.A/Brand";v="8", "Chromium";v="114", "Google Chrome";v="114"
Sec-Ch-Ua-Mobile:
?0
Sec-Ch-Ua-Platform:
"macOS"
Sec-Fetch-Dest:
document
Sec-Fetch-Mode:
navigate
Sec-Fetch-Site:
same-origin
Sec-Fetch-User:
?1
Upgrade-Insecure-Requests:
1
User-Agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

im using server side components only so far

im not using react get/set state

fickle badgeBOT
#

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

#

Based on the headers you've provided, it seems like your request is correctly set to not cache the response (Cache-Control: no-store, must-revalidate). This means that the browser should not store a cached copy of the resource and must revalidate with the server for each request, which is the expected behavior.

However, you mentioned that you're still seeing old data when fetching from your endpoint. This could be due to a few reasons:

  1. Server-side caching: Even though your client-side fetch request is set to not cache, the server might still be caching the response. You can check this by looking at the response headers of your fetch request in the Network tab of your browser's developer tools. If you see headers like ETag or Last-Modified, it means the server is caching the response.

  2. Data not being updated on the server: If your data is not being updated on the server, you will keep getting the old data even if you're not caching the response. Make sure that your data is being correctly updated on the server.

  3. Asynchronous nature of fetch: The fetch function is asynchronous, which means it doesn't block the rest of your code from running while it's fetching data. If you're logging the data immediately after calling fetch, you might still see the old data. Make sure you're waiting for the fetch to complete before logging the data. You can do this by using the await keyword or by using .then().

Here's an example of how to use await with fetch:

const response = await fetch('<http://localhost:3000/api/test',> { cache: 'no-store' });
const data = await response.json();
console.log(data);

And here's how to use .then():

fetch('<http://localhost:3000/api/test',> { cache: 'no-store' })
  .then(response => response.json())
  .then(data => console.log(data));
#

If none of these suggestions help, please provide more information about your setup and I'll be glad to assist you further.

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