# ValueError: Invalid cookie value

- **ID:** `python/fastapi-cookie-parse-error`
- **Domain:** python
- **Category:** data_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

请求中的Cookie格式不正确，无法被解析。

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |

## Workarounds

1. **** (95% success)
   ```
   使用FastAPI的Cookie参数：
@app.get("/items")
async def read_items(session: str = Cookie(None)):
    return {"session": session}
   ```
2. **** (90% success)
   ```
   捕获异常：
try:
    cookie = request.cookies["session"]
except KeyError:
    cookie = None
   ```

## Dead Ends

- **** — 尝试手动解析Cookie但忽略异常。 (70% fail)
- **** — 使用错误的Cookie名称。 (60% fail)