How to make a public bucket.

public_bucket_policy.json

{
	"Version": "2008-10-17",
	"Id": "Policy1380798333679",
	"Statement": [
		{
			"Sid": "Stmt1380798047704",
			"Effect": "Allow",
			"Principal": {
				"AWS": "*"
			},
			"Action": "s3:GetObject",
			"Resource": "arn:aws:s3:::welvi-maintenance/*"
		}
	]
}

public_read_cors.xml

<CORSConfiguration>
    <CORSRule>
        <AllowedOrigin>*</AllowedOrigin>
        <AllowedMethod>GET</AllowedMethod>
        <MaxAgeSeconds>3000</MaxAgeSeconds>
        <AllowedHeader>Authorization</AllowedHeader>
    </CORSRule>
</CORSConfiguration>

S3_static_website_hosting_routing_rules

All routes under welvi/ redirects to 503.html

<RoutingRules>
    <RoutingRule>
        <Condition>
            <KeyPrefixEquals>welvi/</KeyPrefixEquals>
        </Condition>
        <Redirect>
            <ReplaceKeyWith>503.html</ReplaceKeyWith>
        </Redirect>
    </RoutingRule>
</RoutingRules>