Implement AWS Lambda Web Services with Java.
	1. To create an execution role
		- Open the roles page in the IAM console.
		- Choose Create role.
		- Create a role with the following properties.
		- Trusted entity – Lambda.
		- Permissions – AWSLambdaBasicExecutionRole.
		- Role name – lambda-role.
		- The AWSLambdaBasicExecutionRole policy has the permissions that the function needs to write logs to CloudWatch Logs.
		- You can add permissions to the role later, or swap it out for a different role that's specific to a single function.
	

	2. To create a Java function
		- Open the Lambda console.
		- Choose Create function.
		- Configure the following settings:
		- Name – my-function.
		- Runtime – Java 11.
		- Role – Choose an existing role.
		- Existing role – lambda-role.
		- Choose Create function.
		- To configure a test event, choose Test.
		- For Event name, enter test.
		- Choose Save changes.
		- To invoke the function, choose Test.

	package cc.peerapat;

	import com.amazonaws.services.lambda.runtime.Context;
	import com.amazonaws.services.lambda.runtime.RequestHandler;
	import com.amazonaws.services.lambda.runtime.events.APIGatewayV2HTTPEvent;
	import com.amazonaws.services.lambda.runtime.events.APIGatewayV2HTTPResponse;
	
	import java.util.HashMap;
	import java.util.Map;
	
	/**
	* cc.peerapat.BahtTextHTTP::handleRequest
	*/
	public class BahtTextHTTP implements RequestHandler {
	
		final Map headers = new HashMap<>();
	
		public BahtTextHTTP() {
			headers.put("Content-Type", "text/plain");
		}
	
		@Override
		public APIGatewayV2HTTPResponse handleRequest(final APIGatewayV2HTTPEvent request, final Context context) {
			return buildResponse(BahtText.toText(request.getBody()));
		}
	
		private APIGatewayV2HTTPResponse buildResponse(final String body) {
			final APIGatewayV2HTTPResponse response = new APIGatewayV2HTTPResponse();
			response.setIsBase64Encoded(false);
			response.setStatusCode(200);
			response.setHeaders(headers);
			response.setBody(body);
			return response;
		}
	
	}