This type of syntax specifies that a redirect of the request should be performed. The body of the <redirect-to>
specifies where. Variables, if present, are replaced, in the body.
For example you can redirect a successful request to a "thank.you.html" url.
Parameters like ${foo}
in the body are replaced.
If you use variables, we recommend to use this optional element to prevent a malicious request redirecting somewhere wrong:
If no such tag is present, redirect to any URL is allowed. If one or more are present, the URL being redirected to must start with the prefix of one of them; otherwise this is an error.