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Overview

API Gateway events consist of a request that was routed to a Lambda function by API Gateway. When this happens, API Gateway expects the result of the function to be the response that API Gateway should respond with.

Sample Function

The following is a sample class and Lambda function that receives Amazon API Gateway event record data as an input, writes some of the record data to CloudWatch Logs, and responds with a 200 status and the same body as the request. (Note that by default anything written to Console will be logged as CloudWatch Logs events.)

package main

import (
	"context"
	"fmt"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
)

func handleRequest(ctx context.Context, request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
	fmt.Printf("Processing request data for request %s.\n", request.RequestContext.RequestID)
	fmt.Printf("Body size = %d.\n", len(request.Body))

	fmt.Println("Headers:")
	for key, value := range request.Headers {
		fmt.Printf("    %s: %s\n", key, value)
	}

	return events.APIGatewayProxyResponse{Body: request.Body, StatusCode: 200}, nil
}

func main() {
	lambda.Start(handleRequest)
}
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