Next.js is caching my server side pages. How to disable that? - caching

Question

I have an issue I'm having trouble to investigate: I have a production compiled server at https://preprod.weally.org/ (through nginx)
I opened the port 3000 to access directly the next server (http://preprod.weally.org:3000/)
My issue is that when I log in, I'm supposed to see a different content than a non logged user. Also editing an article should show the updated article immediately to all other users.
I noticed the returned page is correct only for its first display, it then always returns the same for any browser session: (refresh occurs only when I restart the server).
After incriminating nginx of caching for hours, I realized it was Next.js that was not calling the endpoint /api/graphql, but getting its content from cache.
My next.config.js is supposed to avoid caching (you can see the build output saying /api/graphql is server side rendered)
Note: when I run the server in dev mode (yarn dev), everything works as expected
const { i18n } = require('./next-i18next.config');
module.exports = {
i18n,
generateEtags: false,
compress: false,
};
My question is: "what is the next step in my investigation?". I'm not feeling comfortable to debug the build process of next.js
Here's the "yarn build" output:
Page Size First Load JS
┌ λ / 3.46 kB 288 kB
├ /_app 0 B 167 kB
├ ○ /404 195 B 167 kB
├ ○ /about (1049 ms) 1.69 kB 169 kB
├ λ /api/auth/[...nextauth] 0 B 167 kB
├ λ /api/auth/callback/ignore-facebook 0 B 167 kB
├ λ /api/graphql 0 B 167 kB
├ λ /api/rest/[...restEndpoint] 0 B 167 kB
├ λ /business/[businessId]/detail 10.2 kB 295 kB
├ ○ /legal/data_deletion (2485 ms) 2.06 kB 169 kB
├ ○ /legal/privacy_policy (2510 ms) 8.6 kB 176 kB
├ ○ /legal/terms (2478 ms) 14.8 kB 182 kB
├ λ /request/[issueId]/detail 608 B 285 kB
├ λ /request/[issueId]/edit 46.5 kB 284 kB
├ ○ /signin (1143 ms) 1.94 kB 172 kB
├ ○ /signout (1111 ms) 2.46 kB 169 kB
└ ○ /signup (1094 ms) 1.73 kB 172 kB
+ First Load JS shared by all 167 kB
├ chunks/framework.3af989.js 42.6 kB
├ chunks/main.fa7488.js 24.5 kB
├ chunks/pages/_app.f19732.js 98.1 kB
├ chunks/webpack.32a7fa.js 1.72 kB
└ css/5d6d9ddf7d6a4cfee084.css 1.56 kB
λ (Server) server-side renders at runtime (uses getInitialProps or getServerSideProps)
○ (Static) automatically rendered as static HTML (uses no initial props)
● (SSG) automatically generated as static HTML + JSON (uses getStaticProps)
(ISR) incremental static regeneration (uses revalidate in getStaticProps)