# 调用API报"Incorrect app authentication information"
APP认证信息错误有：
- [Incorrect app authentication information: app not found, appkey xxx]
- [Incorrect app authentication information: verify signature fail, canonicalRequest]
- [Incorrect app authentication information: signature expired]
 #### Incorrect app authentication information: app not found, appkey xxx
```
{ 
  "error_msg": "Incorrect app authentication information: app not found, appkey 0117***e5e1",    
  "error_code": "APIG.0303",    
  "request_id": "a532***5aca"
}
```
**可能原因**
appkey配置错误。
**解决方法**
1. 在API网关控制台页面的左侧导航栏中选择"API管理 \> 凭据管理"。
2. 单击对应的凭据名称，进入凭据详情。
3. 查看"Key"值，并重新配置appkey。
 #### Incorrect app authentication information: verify signature fail, canonicalRequest
```
{    
  "error_msg": "Incorrect app authentication information: verify signature fail, canonicalRequest:GET|/test/||host:d7da***3df7.example.com|x-sdk-date:20230527T015431Z||host;x-sdk-date|e3b0c***52b855",   
  "error_code": "APIG.0303",    
  "request_id": "cb14***62dc"
}
```
**可能原因**
签名认证算法使用有问题，客户端计算的签名结果与API网关计算的签名结果不同。
**解决方法**
请参考[Incorrect IAM authentication information: verify aksk signature fail](https://support.huaweicloud.com/apig_faq/apig-faq-0003.html#apig-faq-0003__zh-cn_topic_0000001212792613_zh-cn_topic_0000001128323062_section18226134155618)。
 #### Incorrect app authentication information: signature expired
```
{
  "error_msg": "Incorrect app authentication information: signature expired, signature time:20230527T000431Z,server time:20230527T020608Z",
  "error_code": "APIG.0303",    
  "request_id": "fd65***b8ad"
}
```
**可能原因**
客户端签名时间戳x-sdk-date与APIGW服务器时间相差超过15min。
**解决方法**
检查客户端时间是否正确。