Headers in API Gateway Authorization are not been read - amazon-web-services

Question

I've implemented a Lambda Function to the authorization and i'm getting errors in my test: the headers are empty. I could check that printing the headers in the console (Cloudwatch).
This is the beginning of my handler:
public class Authorizer implements RequestHandler<APIGatewayProxyRequestEvent, AuthorizerResponse> {
public AuthorizerResponse handleRequest(APIGatewayProxyRequestEvent request, Context context) {
Map<String, String> headers = request.getHeaders();
System.out.println("headers: " + headers);
String authorization = headers.get("Authorization");
...
And this is the result:
Talking about the Authorizer, I set up this way:
And finally, I have my Api Gateway set up this way:
Method Request
Integration Request
What do I have wrong?
Thanks in advance.

Answer 1

Let me answer your question here.
You are using a TOKEN type Lambda authorizer. This will pass the "Authorization" header value as a token. You can see the below sample Lambda event data -
{
type: 'TOKEN',
methodArn:'arn:aws:execute-api:$AWS_REGION:$ACCOUNT_ID:$API_ID/$STAGE/$RESOURCE/',
authorizationToken: 'allow'
}
You might have to modify your code accordingly to retrieve this token.
Alternatively, you can use a REQUEST-based Lambda authorizer function. This will send input to Lambda authorizer as a combination of headers, query string parameters, stageVariables, and $context variables. You can then use your existing code to retrieve the headers from the request.
As for setting a mapping template and "Authorization" header in Method Request and Integration Request, you don't need that unless you are planning to pass it to the integration Lambda function as well.