main.go

package main

import (
	"fmt"
	"log"
	"net/http/httptest"
	"net/http/httputil"
	"net/url"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/credentials"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/s3"
)

func awsS3(endpoint string) {
	svc := s3.New(session.New(), &aws.Config{
		Region: aws.String("us-east-1"),
		Credentials: credentials.NewStaticCredentialsFromCreds(
			credentials.Value{
				AccessKeyID:     "*",
				SecretAccessKey: "*",
			}),
		Endpoint: aws.String(endpoint),
	})
	result, err := svc.ListBuckets(nil)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println("Buckets:")
	for _, b := range result.Buckets {
		fmt.Printf("* %s created on %s\n", aws.StringValue(b.Name), aws.TimeValue(b.CreationDate))
	}
}

func main() {
	backendURL := "http://127.0.0.1:9000"
	rpURL, err := url.Parse(backendURL)
	if err != nil {
		fmt.Println("parse error", backendURL)
	}

	frontendProxy := httptest.NewServer(httputil.NewSingleHostReverseProxy(rpURL))
	defer frontendProxy.Close()

	fmt.Println(frontendProxy.URL)
	awsS3(frontendProxy.URL)

}