Service Temporarily Unavailable

Request blocked by Cloudflare from Vercel to sub-domain that is proxied
Here are the details for the issue
I am trying to build the graphql code with Next.js and getting below error

Error occurred prerendering page "/blog". Read more: https://nextjs.org/docs/messages/prerender-error Error: Failed to fetch API at fetchAPI (/vercel/path0/.next/server/pages/blog.js:205:15) at processTicksAndRejections (node:internal/process/task_queues:96:5) at async getAllPostsForHome (/vercel/path0/.next/server/pages/blog.js:241:18) at async getStaticProps (/vercel/path0/.next/server/pages/blog.js:581:22) at async renderToHTML (/vercel/path0/node_modules/next/dist/server/render.js:390:20) at async /vercel/path0/node_modules/next/dist/export/worker.js:260:36 at async Span.traceAsyncFn (/vercel/path0/node_modules/next/dist/trace/trace.js:79:20)

Response from server:

Response { size: 0, timeout: 0, [Symbol(Body internals)]: { body: PassThrough { _readableState: [ReadableState], _events: [Object: null prototype], _eventsCount: 5, _maxListeners: undefined, allowHalfOpen: true, [Symbol(kCapture)]: false, [Symbol(kCallback)]: null }, disturbed: false, error: null }, [Symbol(Response internals)]: { url: 'https://example.com/graphql', status: 503, statusText: 'Service Temporarily Unavailable', headers: Headers { [Symbol(map)]: [Object: null prototype] }, counter: 0 } }

May I ask if you’re using Cloudflare Pages too or rather not?

May I ask if you’re using an A or CNAME type of the DNS record for that particular sub-domain hostname on Vercel? :thinking:

Furthermore, the DNS hostname at DNS tab of Cloudflare dashboard is set to :orange: and proxied?

Is that sub-domain like sub.example.com or rather a deep one like sub.sub.example.com? :thinking: I wonder if we might have a case where a sub-domain would also bee too deep.

I wonder if anything changes when you temporary switch it to :grey: (DNS-only), wait for few minutes then refresh a webpage (F5) in your Web browser or try using a different web browser?

Regarding 503, may I ask what steps for troubleshooting have you tried from the article below?:

I’d just like to share few articles from below for any further case, which might help us here a bit:

  1. Not using Cloudflare pages
  2. Using A record for sub-domain & CNAME and A record for Vercel
  3. This error is when it is set to proxied and working fine without proxy
  4. It’s sub domain with application hosted on VM

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