#server error 502 for my next js on vps server (nginx)

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lilac steepleBOT
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Hi @soft plover. 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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Based on the information extracts provided, there are several possible reasons for a 502 server error in a Next.js application:

  1. INTERNAL_STATIC_REQUEST_FAILED: An error occurred in the platform infrastructure layer. Source (https://vercel.com/docs/errors/platform-error-codes)

  2. NO_RESPONSE_FROM_FUNCTION: The application did not respond correctly, likely due to an exception being thrown from the function handler or other reasons like a global uncaught exception, a global unhandled rejection, or a deployment that introduced incorrect syntax. Source (https://vercel.com/docs/errors/application-error-codes)

  3. FALLBACK_BODY_TOO_LARGE: The response buffer size exceeded the maximum value of 10 MB when making a request to get the content of a page. Source (https://vercel.com/docs/errors/application-error-codes)

  4. TOO_MANY_FORKS: An error occurred in the application when matching too many conditional routes. You cannot have more than 5 has routes matched on a single path. Source (https://vercel.com/docs/errors/application-error-codes)

To troubleshoot the issue, you can review the error logs and identify the specific error code causing the 502 error. Then, follow the troubleshooting steps provided in the relevant source link above.

If you still need assistance, consider providing more information about your specific issue or error message.

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

Vercel Documentation
Platform Error Codes

This section focuses on errors that can happen at the level of the platform when you interact with Vercel.

Vercel Documentation
Application Error Codes

This section focuses on errors that can happen at the level of your application when you interact with Vercel.

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

soft plover
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why i cant find /_next/data after next js build?

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@lilac steeple why i cant find /_next/data after next js build?

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

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The /_next/data directory is not generated directly after running next build. It is created when you run next export for static HTML export. However, if you're using getStaticProps or getStaticPaths, the next export command is not recommended, as it doesn't support these features. Instead, you should use the default server-side rendering provided by Next.js.

If you're using getStaticProps or getStaticPaths, the data for your pages will be fetched at build time and included in the generated HTML files. In this case, you won't see a separate /_next/data directory.

For more information on static HTML export, refer to the Static HTML Export documentation (https://nextjs.org/docs/advanced-features/static-html-export).

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

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

soft plover
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@lilac steeple /_next/data is generated for SSR page?

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

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No, the /_next/data directory is not generated for Server-Side Rendered (SSR) pages. SSR pages use getServerSideProps to fetch data on each request, and the data is included in the generated HTML for the page. The /_next/data directory is related to Static Generation, not SSR.

For more information on SSR and data fetching, refer to the getServerSideProps documentation (https://nextjs.org/docs/api-reference/data-fetching/get-server-side-props).

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

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

soft plover
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@lilac steeple you said /_next/data is not generated for SSR pages, but my production site trying accesa from /_next/data as json file and keep loading for long time without responding

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

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Apologies for the confusion earlier. You're correct that the /_next/data directory is used for pages that are pre-rendered using getStaticProps. When you navigate to a page that's pre-rendered using getStaticProps, Next.js fetches the JSON file (pre-computed at build time) and uses it as the props for the page component. This means that client-side page transitions will not call getStaticProps as only the exported JSON is used source (https://nextjs.org/docs/basic-features/data-fetching/get-static-props#statically-generates-both-html-and-json).

If your production site is trying to access a JSON file from /_next/data and it's taking a long time to load, there might be an issue with the data fetching or the server configuration. To troubleshoot the issue, you can:

  1. Check the server logs for any errors or issues related to data fetching or server configuration.
  2. Review your getStaticProps implementation to ensure it's fetching data correctly and efficiently.
  3. Verify that your server is configured correctly to serve the /_next/data directory.

If you still need assistance, consider providing more information about your specific issue or error message.

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

Data Fetching: getStaticProps | Next.js

Fetch data and generate static pages with getStaticProps. Learn more about this API for data fetching in Next.js.

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

soft plover
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@lilac steeple If I visited from Search SSR pages to multiple SSG Pages and come back to Search SSR then it loading for more time and /_next/data/ and json file pending status on network tab

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

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It seems like you're experiencing performance issues when navigating between SSR and SSG pages in your Next.js application. To improve the performance, you can try the following:

  1. Optimize your data fetching in getServerSideProps for the SSR page. Make sure the API calls are efficient and not causing unnecessary delays. You can also consider caching the results if the data doesn't change frequently.

  2. Review your server configuration, especially if you're using a custom server like Nginx. Ensure that it's configured correctly to serve the /_next/data directory and other static assets.

  3. Check the Network tab in your browser's developer tools to identify any bottlenecks or slow-loading resources. This can help you pinpoint specific issues that might be causing the delay.

  4. If possible, consider using Static Generation with getStaticProps and Incremental Static Regeneration (ISR) for the Search page instead of SSR. This can help improve performance by serving pre-rendered pages from the cache and updating them in the background. You can learn more about ISR in the Next.js documentation (https://nextjs.org/docs/basic-features/data-fetching/incremental-static-regeneration).

Remember to analyze the performance issues carefully and apply the appropriate optimizations based on your specific use case.

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

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

soft plover
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@lilac steeple I have custom server Nginx, give code sample for configuration

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