CDK add mapping templates to LambdaIntegration - amazon-web-services

Question

I have a Lambda function which can be accessed by api gateway.
How can I make CDK to add an Mapping template like in this Screenshot:
I tried multiple variants of this:
....
const restApi = new apigateway.LambdaRestApi(this, "dyndns-api", {
handler: dyndnsLambda,
proxy: false,
domainName: {
domainName: siteDomain,
certificate: certificate,
endpointType: apigateway.EndpointType.REGIONAL
}
});
const methodResponse: apigateway.MethodResponse = {
statusCode: "200",
responseModels: {"application/json": apigateway.Model.EMPTY_MODEL}
}
const requestTemplate = {
"execution_mode" : "$input.params('mode')",
"source_ip" : "$context.identity.sourceIp",
"set_hostname" : "$input.params('hostname')",
"validation_hash" : "$input.params('hash')"
}
const dnydnsIntegration = new apigateway.LambdaIntegration(dyndnsLambda, {
allowTestInvoke: true,
passthroughBehavior: apigateway.PassthroughBehavior.WHEN_NO_TEMPLATES,
requestTemplates: { "application/json": JSON.stringify(requestTemplate) },
});
restApi.root.addMethod("GET", dnydnsIntegration, {
methodResponses: [methodResponse]
});
But with not effect, it does not seem to arrive in the console, as I would expect.

Answer 1

solved it like this:
needed to add proxy setting to restApi, so the requestTemplate gets accepted. also needed integrationResponse.
const restApi = new apigateway.LambdaRestApi(this, "dyndns-api", {
handler: dyndnsLambda,
proxy: false,
domainName: {
securityPolicy: apigateway.SecurityPolicy.TLS_1_2,
domainName: siteDomain,
certificate: certificate,
endpointType: apigateway.EndpointType.REGIONAL
}
});
const methodResponse: apigateway.MethodResponse = {
statusCode: "200",
responseModels: {"application/json": apigateway.Model.EMPTY_MODEL}
}
const integrationResponse: apigateway.IntegrationResponse = {
statusCode: "200",
contentHandling: apigateway.ContentHandling.CONVERT_TO_TEXT
}
const requestTemplate = {
"execution_mode" : "$input.params('mode')",
"source_ip" : "$context.identity.sourceIp",
"set_hostname" : "$input.params('hostname')",
"validation_hash" : "$input.params('hash')"
}
const dnydnsIntegration = new apigateway.LambdaIntegration(dyndnsLambda, {
allowTestInvoke: true,
proxy: false,
integrationResponses: [integrationResponse],
passthroughBehavior: apigateway.PassthroughBehavior.WHEN_NO_TEMPLATES,
requestTemplates: { "application/json": JSON.stringify(requestTemplate) },
});
restApi.root.addMethod("GET", dnydnsIntegration, {
methodResponses: [methodResponse]
});