Sending Response Header with the Serverless Framework on AWS - node.js

Question

I'm using the Serverless Framework for my Lambda functions on AWS. How can I send authorization headers? My current config:
Lambda function:
module.exports.createUser = (event, context, callback) => {
let response = {
statusCode: 302,
headers: {
"Authorization": userUtil.getToken(userId)
},
body: ""
};
callback(null, response);
return;
}
serverless.yml:
createUser:
handler: functions/user.createUser
events:
- http:
path: users
method: post
cors: true
integration: lambda
The above config sends the response object as body. The status is still 200.
I'm using Serverless v1.10

Answer 1

If you want to set the status code, headers and body in your code, instead of adding them in your configuration, you need to use the Lambda-proxy setting. See more here.
Lambda-proxy is the default type. So you need to remove the integration: lambda in your serverless.yml. Also, remove the cors: true setting and modify the handler.js to add CORS headers.
Modify your Lambda function to:
module.exports.createUser = (event, context, callback) => {
let response = {
statusCode: 302,
headers: {
"Authorization": userUtil.getToken(userId),
"Access-Control-Allow-Origin" : "*", // Required for CORS support to work
"Access-Control-Allow-Credentials" : true // Required for cookies, authorization headers with HTTPS
},
body: ""
};
callback(null, response);
return;
}
Modify your serverless.yml file to:
createUser:
handler: functions/user.createUser
events:
- http:
path: users
method: post