javascript 如何在 2018 年访问 AWS Lambda 中的标头
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How to Access header in AWS Lambda in 2018
提问by Michael Coxon
Yes, I know this is a duplicate, however things have changed since the Mapping Template solution provided here, hereand herewas devised. With a proxy integration (the AWS recommended approach), there is no access to templates. So how do you get to the headers now?
是的，我知道这是重复的，但是自从设计了此处、此处和此处提供的映射模板解决方案以来，情况发生了变化。通过代理集成（AWS 推荐的方法），无法访问模板。那么你现在如何获得标题？
I have tried just using the object model with things like:
我曾尝试将对象模型与以下内容一起使用：
event.headers
event.headers["X-Requested-With"]
var headerItem = "x-requested-with"
event.headers.headerItem
etc. and nothing seems to be defined.
等等，似乎没有任何定义。
The event, according to Cloudwatch, is:
根据 Cloudwatch 的说法，该事件是：
{
"resource": "/contactformlambda",
"path": "/contactformlambda",
"httpMethod": "POST",
"headers": {
"Accept": "application/json, text/plain, */*",
"Accept-Encoding": "gzip, deflate, br",
"Accept-Language": "en-US,en;q=0.9",
"cache-control": "no-cache",
"CloudFront-Forwarded-Proto": "https",
"CloudFront-Is-Desktop-Viewer": "true",
"CloudFront-Is-Mobile-Viewer": "false",
"CloudFront-Is-SmartTV-Viewer": "false",
"CloudFront-Is-Tablet-Viewer": "false",
"CloudFront-Viewer-Country": "AU",
"content-type": "text/plain",
"Host": "ovo5xmxf7e.execute-api.ap-southeast-2.amazonaws.com",
"origin": "http://localhost:4200",
"pragma": "no-cache",
"Referer": "http://localhost:4200/contact",
"User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36",
"Via": "2.0 49d473f12cd3746d92748f257e16ca9e.cloudfront.net (CloudFront)",
"X-Amz-Cf-Id": "7_PvRhkwbB7wmB1n8EFgE9s84q1xPYZ_uKwAjwYPXSv383M-fmDTgQ==",
"X-Amzn-Trace-Id": "Root=1-5a826e92-b4425f8069686c808cc2d500",
"X-Forwarded-For": "155.144.114.41, 54.240.152.46",
"X-Forwarded-Port": "443",
"X-Forwarded-Proto": "https",
"x-requested-with": "Angular5"
},
"queryStringParameters": null,
"pathParameters": null,
"stageVariables": null,
"requestContext": {
"requestTime": "13/Feb/2018:04:50:26 +0000",
"path": "/prod/contactformlambda",
"accountId": "499908792600",
"protocol": "HTTP/1.1",
"resourceId": "i6i1qv",
"stage": "prod",
"requestTimeEpoch": 1518497426058,
"requestId": "683aeec6-1079-11e8-a419-318ae32195ef",
"identity": {
"cognitoIdentityPoolId": null,
"accountId": null,
"cognitoIdentityId": null,
"caller": null,
"sourceIp": "155.144.114.41",
"accessKey": null,
"cognitoAuthenticationType": null,
"cognitoAuthenticationProvider": null,
"userArn": null,
"userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36",
"user": null
},
"resourcePath": "/contactformlambda",
"httpMethod": "POST",
"apiId": "ovo5xmxf7e"
},
"body": "{\"subject\":\"Enquiry from ZenithWebFoundry\",\"name\":\"Mike\",\"number\":\"0415118180\",\"email\":\"[email protected]\",\"comment\":\"this is a test from localhost\"}",
"isBase64Encoded": false
}
The "x-requested-with" header is in there, but it never seems to be defined, when I try to access it programmatically
“x-requested-with”标头在那里，但当我尝试以编程方式访问它时，它似乎从未被定义过
回答by dashmug
It should be in event.headers.
它应该在event.headers.
From documentation, it states...
从文档中，它指出......
{
"resource": "Resource path",
"path": "Path parameter",
"httpMethod": "Incoming request's method name"
"headers": {Incoming request headers}
"queryStringParameters": {query string parameters }
"pathParameters": {path parameters}
"stageVariables": {Applicable stage variables}
"requestContext": {Request context, including authorizer-returned key-value pairs}
"body": "A JSON string of the request payload."
"isBase64Encoded": "A boolean flag to indicate if the applicable request payload is Base64-encode"
}
Update (based on your new supplied information):
更新（基于您提供的新信息）：
The header that you're looking for is x-requested-withNOT X-Requested-With(note the casing).
您要查找的标题x-requested-with不是X-Requested-With（注意大小写）。
// This will yield nothing, as it is the wrong key
event.headers['X-Requested-With']
// This will give you what you need.
event.headers['x-requested-with']
Take note that object lookup in Javascript is case-sensitive.
请注意，Javascript 中的对象查找区分大小写。
If you want to retrieve it using a variable, you can do the following...
如果要使用变量检索它，可以执行以下操作...
var headerItem = "x-requested-with"
event.headers[headerItem]
