n8n - 💡(How to fix) Fix OpenAPI key issue config.headers.setContentType

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Error Message

Error:

  • same error persists
  • error: all

Fix Action

Fix / Workaround

Can you move/fix/update my workspace or advise a Cloud-side workaround?

Debug info

RAW_BUFFERClick to expand / collapse

Hi n8n support,

My n8n Cloud workspace cannot connect OpenAI credentials.

Error: Couldn’t connect with these settings config.headers.setContentType is not a function

What I already tried:

  • logged out/in
  • created a fresh OpenAI API key
  • added the credential from scratch
  • Organization ID empty
  • Base URL: https://api.openai.com/v1
  • same error persists

This looks like the known n8n Cloud/OpenAI credential regression reported here: https://community.n8n.io/t/openai-credentials-fail-on-n8n-cloud-2-19-3-with-config-headers-setcontenttype-is-not-a-function/294818 https://github.com/n8n-io/n8n/issues/29471

Can you move/fix/update my workspace or advise a Cloud-side workaround?

Debug info

core

  • n8nVersion: 2.19.5
  • platform: docker (cloud)
  • nodeJsVersion: 24.14.1
  • nodeEnv: production
  • database: sqlite
  • executionMode: regular
  • concurrency: 5
  • license: enterprise (sandbox)

storage

  • success: all
  • error: all
  • progress: false
  • manual: true
  • binaryMode: filesystem

pruning

  • enabled: true
  • maxAge: 168 hours
  • maxCount: 2500 executions

client

  • userAgent: mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/148.0.0.0 safari/537.36
  • isTouchDevice: false

Generated at: 2026-05-20T14:59:00.399Z

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