HTTP Request node broken after update to n8n Cloud 2.19.5

Describe the problem/error/question

After the upgrade to n8n Cloud 2.19.5, HTTP Request nodes fail before sending the request.

The issue happens with:

• old HTTP Request nodes
• newly created HTTP Request nodes
• Authentication = None
• manual headers
• JSON headers
• "Using Fields Below" headers

The request never reaches the API endpoint.

The problem started immediately after the cloud update.

What is the error message (if any)?

config.headers.setContentType is not a function

Stack trace references:

NodeApiError: config.headers.setContentType is not a function

Please share your workflow/screenshots/recording

Minimal reproduction:

HTTP Request node:

• Method: GET
• URL: https://api.openai.com/v1/vector_stores
• Authentication: None

Headers:

• Authorization: Bearer sk-xxxxx
• OpenAI-Beta: assistants=v2

The same error also happens with:

• Content-Type removed
• simple GET requests
• newly created HTTP Request nodes

Environment:

• n8n Cloud
• version: 2.19.5

Expected behavior

HTTP Request node should execute normally and send the request.

Additional information

The issue seems related to internal header handling in the HTTP Request node/runtime.

The error occurs before the request is sent.