amazon s3 - internal 301 redirect

<RoutingRules>
    <RoutingRule>
        <Condition>
            <KeyPrefixEquals>old-slug</KeyPrefixEquals>
        </Condition>
        <Redirect>
            <Protocol>http-or-https</Protocol>
            <HostName>yourdomain.tld</HostName>
            <ReplaceKeyPrefixWith>new-slug</ReplaceKeyPrefixWith>
            <HttpRedirectCode>301</HttpRedirectCode>
        </Redirect>
    </RoutingRule>
</RoutingRules>

If you like to redirect a URL internally on Amazon S3: this is how it works. (also for external redirects).