Question

我已经创建了与AWS API Gateway集成的Lambda函数。我已经从Integration Request配置了模板模型，以便可以从Lambda函数中的Event对象访问请求标头。

从cloudWatch中，我观察到在代码执行期间console.log（event）并不总是为空：

以下代码生成了CloudWatch日志：

var moment = require('moment');

var AWS = require('aws-sdk');
var keyPairId = 'APKAIPZ5BRDMEXAMPLE';

var privateKey = '';

var signer = new AWS.CloudFront.Signer(keyPairId, privateKey);
var expireTime = moment().add(3600, 'sec').unix();

exports.handler = (event, context, callback) => {

   console.log(event.headers); //logged twice from cloudWatch

   console.log(event.headers); //Undefined although i can see the data from cloudwatch...

   var domain = 'mydomain.com';
   var resource = 'https://cdn.mydomain.com/*';
   var attributes = '; domain=' + domain + '; path=/; secure; httpOnly'

   var options = {policy : '{"Statement":[{"Resource":"' + resource + 
   '","Condition":{"DateLessThan":{"AWS:EpochTime":' + expireTime + 
    '}}}]}'};

    signer.getSignedCookie(options, function(err, data) {

        if (err) {
        //do somehing

        } else {

           context.done(null, {

            'Set-Cookie': 'CloudFront-Policy=' + data["CloudFront-Policy"] + attributes,
            'SEt-Cookie': 'CloudFront-Signature=' + data["CloudFront-Signature"] + attributes,
            'SeT-Cookie': 'CloudFront-Key-Pair-Id=' + data["CloudFront-Key-Pair-Id"] + attributes


       });

    }
});
};

如上面的代码所述，您能否解释一下为什么console.log(event)从cloudWatch记录两次，而console.log(event['headers'])却导致异常，因为尽管我可以从cloudwatch中看到数据，但报头未定义？

非常感谢！

编辑：

使用REST（CORS）调用lambda函数。我已经从浏览器记录了两个HTTP请求：

具有方法的HTTP请求：OPTIONS

OPTIONS https://mycdn-domain.net/authenticate
Access-Control-Request-Method: GET
Origin: https://origin-domain.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.157 Safari/537.36
Access-Control-Request-Headers: x-api-key
Accept: */*

带有方法GET的HTTP请求

GET https://mycdn-domain.net/authenticate
Origin: https://origin-domain.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.157 Safari/537.36
x-api-key: ************************************
Accept: */*

Lamda函数的事件对象在代码执行期间发生了变化

0 个答案: