This sample can be accessed from:
portal-server-URL/rewriter/HTML/attrib/attribute.html
Ensure that abc.sesta.com and host1.siroe.com are defined in the Proxies for Domains and Subdomains list in the Gateway service.
If this is not defined, a direct connection is assumed, and the Gateway URL is not prefixed.
You need not add the rule specified in this sample to the default_gateway_ruleset because the rule is already defined.