[BUG] Arabic/Persian UTF-8 text is returned as mojibake by Claude Web endpoint

OmniRoute Version

3.8.50

Installation Method

npm (global)

Operating System

Windows

OS Version

Windows 11

Node.js Version

v24.13.0

Provider(s) Involved

Claude Web

Model(s) Involved

Claude

Client Tool

VS Code Chat

Description

Persian/Arabic UTF-8 responses from the Claude Web endpoint are incorrectly decoded and returned as mojibake when used through VS Code Chat.

For example, سلام is returned as سلام instead of the correct UTF-8 text.

Steps to Reproduce

1. Configure OmniRoute 3.8.50 with the Claude Web endpoint.
2. Use the endpoint from VS Code Chat.
3. Send a prompt that produces a Persian/Arabic response.
4. Observe the response in VS Code Chat.

Expected Behavior

Persian/Arabic text should be returned and displayed correctly as UTF-8.

Example: سلام! این پیام یک تست ساده به نظر می‌رسه، نه یک درخواست واقعی برای انجام کاری خاص.

Actual Behavior

Persian/Arabic UTF-8 text is returned as mojibake.

Example: سلام! این پیام یک تست ساده به نظر می‌رسه، نه یک درخواست واقعی برای انجام کاری خاص.

Test Impact

Needs a new unit test

Error Logs / Output

Add an automated test covering UTF-8/Unicode responses from the Claude Web endpoint, including Persian and Arabic text, to ensure the response is decoded correctly.

No explicit error is reported. The issue is an incorrect UTF-8 decoding/encoding of the response body.

Screenshots

Actual:

Expected:

Additional Context

The issue occurs specifically with Persian/Arabic Unicode text. The same endpoint works correctly for non-Persian/Arabic text.

OmniRoute was installed globally via npm on Windows 11 and is being used as the API endpoint for VS Code Chat.

Validation Plan

• Send a Persian response through the Claude Web endpoint and verify that UTF-8 characters are preserved.
• Test Arabic text as well as Persian text.
• Verify the same response in VS Code Chat without mojibake.