codex - 💡(How to fix) Fix Codex App in-app browser does not render iframes on localhost [1 participants]

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openai/codex#20307Fetched 2026-05-01 05:44:13
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What version of the Codex App are you using (From “About Codex” dialog)?

Version 26.422.30944 (2080)

What subscription do you have?

ChatGPT Business

What platform is your computer?

Darwin 25.3.0 arm64 arm

What issue are you seeing?

When using the codex in app browser on a https://localhost:{port} url, iframes on the page do not seem to render. The network tab shows (blocked:other) as the status for loading the iframes. This seems to happen for many iframes, including iframes that work in the browser when not on a localhost url.

What steps can reproduce the bug?

navigate to a https://localhost:{port} url which has an iframe on it and observe the iframe never load and be blocked according to the dev network tools.

What is the expected behavior?

I'd expect the iframe to load.

Additional information

No response

extent analysis

TL;DR

The issue with iframes not rendering on https://localhost:{port} URLs in the Codex App may be due to security restrictions, and using a different URL or configuring the app's security settings could be a potential workaround.

Guidance

  • The (blocked:other) status in the network tab suggests a security-related issue, possibly due to the app's security policies or browser restrictions on loading iframes from localhost URLs.
  • Try accessing the same URL in an external browser to see if the iframes load correctly, which could help determine if the issue is specific to the Codex App's in-app browser.
  • Investigate the Codex App's security settings or documentation to see if there are any configuration options for allowing iframes to load from localhost URLs.
  • Consider using a different URL or a proxy server to test if the issue is specific to localhost URLs.

Notes

The exact cause of the issue is unclear without more information about the Codex App's security policies or the specific iframes being loaded. Further investigation into the app's settings or documentation may be necessary to find a solution.

Recommendation

Apply workaround: Try using a different URL or configuring the app's security settings to allow iframes to load from localhost URLs, as this may help resolve the issue without requiring an upgrade or significant changes.

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