Add custom header to S3 CreateBucket request

Sample code for adding custom header to CreateBucket request.
AWS-SDK's CreateBucket does not let you add custom headers so you have to create your own http request.

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

	"github.com/aws/aws-sdk-go/aws/credentials"
	v4 "github.com/aws/aws-sdk-go/aws/signer/v4"
)

func createBucket() {

	endpoint := "https://xxx.xxx.xxx/"
	region := "region-1"
	bucketName := "bucket-name"

	// Specify accesskey secretkey or read from env with NewEnvCredentials()

	cred := credentials.NewEnvCredentials()

	// cred := credentials.NewStaticCredentialsFromCreds(credentials.Value{
	// 	AccessKeyID:     akey,
	// 	SecretAccessKey: skey,
	// })

	signer := v4.NewSigner(cred)

	httpClient := &http.Client{}

	// Create a PUT request

	req, err := http.NewRequest(http.MethodPut, endpoint+bucketName, nil)
	if err != nil {
		fmt.Print(err)
	}

	// Now add whatever header you want

	req.Header.Add("Content-Type", "application/json")
	req.Header.Add("HEADER-TO-BE-ADDED", "HEADER-TO-BE-ADDED")

	// Sign it

	signer.Sign(req, nil, "s3", region, time.Now())

	// Send the request
	res, err := httpClient.Do(req)
	log.Println(res.Status)

}```