Codex manual fetch fails after redirect because checksum header is only on the 308 response

What version of Codex CLI is running?

codex-cli 0.144.2, macOS, 2026-07-13

What subscription do you have?

ChatGPT Pro 20x

Which model were you using?

gpt-5.6-sol-ultra

What platform is your computer?

_No response_

What terminal emulator and version are you using (if applicable)?

_No response_

Codex doctor report

What issue are you seeing?

Bundled fetch-codex-manual.mjs rejects the official manual and requires web-search fallback.

What steps can reproduce the bug?

developers.openai.com/codex/codex-manual.md redirects to learn.chatgpt.com/docs/codex-manual.md; x-content-sha256 is present on the redirect but absent from the final response.

What is the expected behavior?

_No response_

Additional information

_No response_