Access Query parameters in Spring cloud function + AWS Lamba + API gateway

Question

I am using Spring cloud function with AWS Lambda and API Gateway.

Below is my function:

 @Bean
        public Function<String, User> testFunction() {
            return (input) -> {
                return new User(1, input);
            };

Also, I have specified the handler in AWS Lambda console as below: org.springframework.cloud.function.adapter.aws.FunctionInvoker::handleRequest

If I send a Request with string body, it is successfully able to collect the input.

But I do not understand, how do I access the request query parameters inside the function? Something like this: https://[apigateway].aws.com/[path]?param1=value

Can someone guide me? Thanks in advance.