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n8n - 💡(How to fix) Fix OpenAI credential test fails: config.headers.setContentType is not a function

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Error Message

Describe the problem/error/question

What is the error message (if any)?

Using the OpenAI node with "My own credential" selected. The error appears in the credential setup screen when hitting Retry or saving. Tried creating multiple credentials (OpenAI account 1, 2, 3, 4) - all fail with the same error.

  • error: all
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Describe the problem/error/question

When trying to set up an OpenAI credential in n8n, the connection test fails immediately. This happens with every new credential I create. The issue persists after clearing browser cache and re-logging in.

What is the error message (if any)?

config.headers.setContentType is not a function

Please share your workflow/screenshots/recording

Using the OpenAI node with "My own credential" selected. The error appears in the credential setup screen when hitting Retry or saving. Tried creating multiple credentials (OpenAI account 1, 2, 3, 4) - all fail with the same error.

Share the output returned by the last node

N/A - workflow cannot execute due to credential failure.

Debug info

core

  • n8nVersion: 2.19.4
  • platform: docker (cloud)
  • nodeJsVersion: 24.14.1
  • nodeEnv: production
  • database: sqlite
  • executionMode: regular
  • license: enterprise (sandbox)

storage

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

client

  • userAgent: mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36
  • isTouchDevice: false
  • Generated at: 2026-05-07T15:31:15.924Z

API key is valid - confirmed $5 credit balance in OpenAI account.

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#api#ISR setup#authentication setup#request error#file not found

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