bug: x-opencode-directory header invalid on Windows Chinese path #13256

Description

Describe the bug

On Windows system, starting opencode in a directory with Chinese characters (e.g., 待办) or using default backslash path (\) triggers a TypeError for invalid x-opencode-directory header value.

To Reproduce

Steps to reproduce the behavior:

1. Create a folder with Chinese characters: C:\Users\KC\Desktop\MyFile\待办
2. Navigate to the folder: cd C:\Users\KC\Desktop\MyFile\待办
3. Run command: opencode
4. See error: TypeError: Header 'x-opencode-directory' has invalid value: 'C:\Users\KC\Desktop\MyFile\待办'

Expected behavior

opencode should support Windows paths with Chinese characters and backslashes, start normally without errors.

Actual behavior

Error log:
{
"name": "UnknownError",
"data": {
"message": "TypeError: Header 'x-opencode-directory' has invalid value: 'C:\Users\KC\Desktop\MyFile\待办'\n at set (unknown)\n at mergeHeaders (../sdk/js/src/gen/client/utils.gen.ts:184:23)\n at mergeConfigs (../sdk/js/src/gen/client/utils.gen.ts:161:20)\n at createClient (../sdk/js/src/gen/client/client.gen.ts:21:17)\n at createOpencodeClient (../sdk/js/src/client.ts:28:18)\n at (src/plugin/index.ts:25:20)\n at (src/project/state.ts:22:21)\n at init2 (src/plugin/index.ts:123:25)\n at InstanceBootstrap (src/project/bootstrap.ts:19:16)\n at (src/project/instance.ts:34:23)\n at async provide (src/project/instance.ts:40:23)"
}
}

Environment

• OS: Windows 10/11
• Shell: PowerShell
• opencode version: 1.1.56

Workaround

1. Rename folder to English (e.g., todo) → works
2. Use forward slash path: opencode --directory "C:/Users/KC/Desktop/MyFile/待办" → works

Suggested fix

The issue may be caused by:

• Missing escape for Windows backslash (\) in HTTP header value
• No handling for Chinese character encoding in path

Plugins

[email protected]

OpenCode version

1.1.56

Steps to reproduce

Steps to reproduce the behavior:

1. Create a folder with Chinese characters: C:\Users\KC\Desktop\MyFile\待办
2. Navigate to the folder: cd C:\Users\KC\Desktop\MyFile\待办
3. Run command: opencode
4. See error: TypeError: Header 'x-opencode-directory' has invalid value: 'C:\Users\KC\Desktop\MyFile\待办'

Screenshot and/or share link

Operating System

Windows11

Terminal

Windows PowerShell