<RoutingRules>
<RoutingRule>
<Condition>
<HttpErrorCodeReturnedEquals>404</HttpErrorCodeReturnedEquals>
</Condition>
<Redirect>
<HostName>yourdomainname.com</HostName>
<ReplaceKeyPrefixWith>#!/</ReplaceKeyPrefixWith>
</Redirect>
</RoutingRule>
</RoutingRules>
http://stackoverflow.com/questions/16267339/s3-static-website-hosting-route-all-paths-to-index-html
http://aserafin.pl/2016/03/23/react-router-on-amazon-s3/