无法使用AWS签名React Native验证签名

Question

请找到以下代码。抛出请求中包含的安全令牌是无效错误。相同的凭据正在与Postman一起使用。我正在使用 react-native-aws-signature 。代码有什么问题？

var awsSignature = new AWSSignature();
        let credentials = {
            SecretKey: secret_key,
            AccessKeyId: access_key
        };
        var options = {
            path: '/PATH',
            method: 'POST',
            service: service',
            headers: {
                'X-Amz-Date': '20190205T105212Z',
                'host': host,
                'X-Amz-Security-Token': security_token
            },
            region: region,
            body: '',
            credentials
        };
        awsSignature.setParams(options);
        var signature = awsSignature.getSignature();
        var authorization = awsSignature.getAuthorizationHeader();

        fetch(prefix + '/api_url', {
            method: 'POST',
            headers: {
                Accept: 'application/json',
                'Content-Type': 'application/json',
                'user_id': userId,
                'X-Amz-Date': '20190205T105212Z',
                'id_token': idToken,
                'Authorization': authorization.Authorization
            },
            body: JSON.stringify(PostData),
        })
            .then((response) => console.warn('response', response))
            .catch((error) => console.warn('error', error));