This policy setting controls whether forms and form templates follow URL redirections provided by Microsoft SharePoint Foundation ...

This policy setting controls whether forms and form templates follow URL redirections provided by Microsoft SharePoint Foundation during a gradual upgrade.            If you enable this policy setting, you can choose from three different redirection options:            - Allow redirections to any location. If this option is selected, poorly planned gradual upgrades could put sensitive information at risk.            - Allow redirections to Intranet only. This option is the default configuration in InfoPath. Redirects to the local intranet are allowed, but redirects to other locations are blocked.            - Block all redirections. This option prevents InfoPath from using redirections completely.            If you do not configure this policy setting, InfoPath automatically redirects user requests for sites that have not been upgraded to the temporary URL if it is located on the local intranet, but blocks them if the temporary URL is located elsewhere. InfoPath will prompt users before redirecting forms or form templates to another intranet site.            If you disable this policy setting, all requests to sites that have not been upgraded will be redirected to their targets, regardless of location. This functionality could cause requests made to a secure site to be redirected to an unsecured one (for example, requests to an intranet site could be redirected to an unencrypted Internet site), causing sensitive information to be at risk.