INVALID_IMAGE_OPTIMIZE_REQUEST on some JPEG images

[JulianKingman]

Link to the code that reproduces this issue

can't find an example :\

To Reproduce

There are certain images that seem to trigger this issue (can't post here for privacy reasons). It turns out the reason for this is that the images have certain protections provided by Incapsula CDN. The thing that finally helped me figure this out was seeing the server-side errors like this:

⨯ The requested resource isn't a valid image for https://example.com/assets/images/example_540x540.jpeg received text/html

I'm just posting this issue here in case anyone comes hunting a difficult to debug error. You can check if this is the issue by getting the image via curl command. If it returns HTML, it's probably a CDN issue.

Current vs. Expected behavior

_next cache fails. A warning might be nice, something like The requested endpoint returned HTML, check that it's a valid URL and doesn't have firewall protections preventing access.

No action is needed though and this can be closed.

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.3.0: Thu Jan  2 20:24:16 PST 2025; root:xnu-11215.81.4~3/RELEASE_ARM64_T6000
  Available memory (MB): 65536
  Available CPU cores: 10
Binaries:
  Node: 18.20.4
  npm: 10.7.0
  Yarn: 1.22.22
  pnpm: 9.10.0
Relevant Packages:
  next: 14.2.21 // An outdated version detected (latest is 15.2.4), upgrade is highly recommended!
  eslint-config-next: 14.2.3
  react: 18.3.1
  react-dom: 18.3.1
  typescript: 5.7.3
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

Image (next/image)

Which stage(s) are affected? (Select all that apply)

next dev (local), Vercel (Deployed)

Additional context

No response

[github-actions]

We could not detect a valid reproduction link. Make sure to follow the bug report template carefully.

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I did not open this issue, but it is relevant to me, what can I do to help?

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Useful Resources

• How to Contribute to Open Source (Next.js)
• How to create a Minimal, Complete, and Verifiable example
• Reporting a Next.js bug
• Next.js Triaging issues