Package gateway provides a drop-in replacement for net/http's ListenAndServe for use in AWS Lambda & API Gateway, simply swap it out for gateway.ListenAndServe. Extracted from Up which provides additional middleware features and operational functionality.

There are two versions of this library, version 1.x supports AWS API Gateway 1.0 events used by the original REST APIs, and 2.x which supports 2.0 events used by the HTTP APIs. For more information on the options read Choosing between HTTP APIs and REST APIs on the AWS documentation website.

Installation

To install version 1.x for REST APIs.

go get github.com/apex/gateway

To install version 2.x for HTTP APIs.

go get github.com/apex/gateway/v2

Example

package main

import (
	"fmt"
	"log"
	"net/http"
	"os"

	"github.com/apex/gateway"
)

func main() {
	http.HandleFunc("/", hello)
	log.Fatal(gateway.ListenAndServe(":3000", nil))
}

func hello(w http.ResponseWriter, r *http.Request) {
	// example retrieving values from the api gateway proxy request context.
	requestContext, ok := gateway.RequestContext(r.Context())
	if !ok || requestContext.Authorizer["sub"] == nil {
		fmt.Fprint(w, "Hello World from Go")
		return
	}

	userID := requestContext.Authorizer["sub"].(string)
	fmt.Fprintf(w, "Hello %s from Go", userID)
}