AWS Lambda Controller route not matching, with {proxy+} - 404 Not Found - amazon-web-services

Question

I have a .NET core 3.1 project with a GET endpoint. Locally the route works fine - "/api" GET request returns JSON string.
After publishing to my AWS Lambda function, and invoking the lambda via Postman, I get a 404 Not Found response to the "/api" GET request. Full URL: "https://(lambda domain)/default/MyLambda2/api"
In my project's Startup.cs ConfigureServices and Configure methods, I added "LambdaLogger.Log" statements. My log lines show up in CloudWatch (so I am definitely reaching the app). It's just after that, the route fails.
In ConfigureServices method, I have
services.AddControllers();
In Configure method, I have
app.UseRouting();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
});
And in the Controller file
namespace LambdaTest.Controllers
{
[Route("api")]
public class ValuesController : ControllerBase
{
[HttpGet]
public IEnumerable<string> Get()
{
return new string[] { "value1", "value2" };
}
}
}
I have an API Gateway trigger defined for the lambda, with
API endpoint: "https://(lambda domain)/default/MyLambda2/{proxy+}"
API type: REST
Authorization: NONE
Method: ANY
In Resources tab, I have...
/MyLambda2
ANY
/{proxy+}
ANY
OPTIONS
... and I have all Resources deployed to "default" stage (via Actions > Deploy API).
Here is the default auto-generated serverless.template file...
{
"AWSTemplateFormatVersion": "2010-09-09",
"Transform": "AWS::Serverless-2016-10-31",
"Description": "An AWS Serverless Application that uses the ASP.NET Core framework running in Amazon Lambda.",
"Parameters": {},
"Conditions": {},
"Resources": {
"AspNetCoreFunction": {
"Type": "AWS::Serverless::Function",
"Properties": {
"Handler": "LambdaTest::LambdaTest.LambdaEntryPoint::FunctionHandlerAsync",
"Runtime": "dotnetcore3.1",
"CodeUri": "",
"MemorySize": 256,
"Timeout": 30,
"Role": null,
"Policies": [
"AWSLambda_FullAccess"
],
"Events": {
"ProxyResource": {
"Type": "Api",
"Properties": {
"Path": "/{proxy+}",
"Method": "ANY"
}
},
"RootResource": {
"Type": "Api",
"Properties": {
"Path": "/",
"Method": "ANY"
}
}
}
}
}
},
"Outputs": {
"ApiURL": {
"Description": "API endpoint URL for Prod environment",
"Value": {
"Fn::Sub": "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/"
}
}
}
}
What could be causing the route to not get picked up in lambda?
Thanks

Answer 1

Found the issue. I needed my route on the controller to be
[Route("MyLambda2/api")]