Confirm this is a Node library issue and not an underlying OpenAI API issue

• This is an issue with the Node library

Describe the bug

Bug Description

The SDK throws a fatal error Header name must be a valid HTTP token ["openaı-organization"] on systems running with a Turkish OS locale (e.g., Windows set to Turkish language).

Exact Root Cause

The issue stems directly from src/internal/headers.ts (Line 77):

const lowerName = name.toLowerCase();

When the internal Stainless API engine passes header keys like "OpenAI-Organization" or "OpenAI-Project", JavaScript's standard .toLowerCase() on a Turkish locale converts the uppercase I to a dotless ı, turning the keys into "openaı-organization" and "openaı-project". Since ı is a non-ASCII character, the underlying Node.js network layer (undici/http) fails validation and terminates the process.

Temporary Workaround (Proven to Work)

As a temporary hotfix, manually modifying the packaged bundle (e.g., extension.js in IDE extensions) and changing the literal definitions from camelCase to strict lowercase entirely prevents this bug:

• Change "OpenAI-Organization" to "openai-organization"
• Change "OpenAI-Project" to "openai-project"
  By declaring them lowercase from the start, we bypass the need for runtime normalization which triggers the Turkish I-problem.

Suggested Official Fix

To ensure locale-invariant header normalization, replace the standard .toLowerCase() with a locale-safe conversion in headers.ts:

const lowerName = name.toLocaleLowerCase('en-US');

To Reproduce

1. Set the operating system language/locale to Turkish (tr-TR).
2. Install the openai-node library.
3. Attempt to initialize the client and make an API request using a third-party proxy provider (e.g., OpenRouter) that passes through header builders.
4. The system throws a fatal token validation error due to "openaı-organization".

Code snippets

OS

Windows (with Turkish locale / tr-TR)

Node version

Managed internally by Continue IDE extension

Library version

Latest version bundled inside Continue IDE extension