Hello,We've created a custom protocol in-house that will launch legacy appli

Question

Hello,We've created a custom protocol in-house that will launch legacy applications from a web page, but I'm having some issues implementing this on an appian form. When I use the following URL as the destination of a link control:runapp://snlentry/westx/DocumentsForm/Environment=2/Flags=-1/KeyObject=103/Key=13585359/ The link works as expected, in that it launches our legacy application.However, having static URLs is not a long-term use case for launching legacy apps, so I created an expression rule whereby various pvs and constants can be passed into the rule to generate the URL dynamically.The expression rule I created looks like this:="<a href='runapp://snlentry/westx/"&'pv!formName_txt'&"/Environment="&'cons!WestXDev'&"/Flags=-1/KeyObject="&'pv!keyObject_int'&"/Key="&'pv!OID_int'&"/'>Launch Me</a>" However, I'm having issues in using this expression rule in a form. I've seen the following behavior:

phillip.russell · Accepted Answer

This is due to the security of the application. Antisamy rules applied to the properties of the <a> tag prevent any URI schemas other than sftp, http/s, ftp/s and mailto. For more information re: this setting with Appian Cloud sites, please open a support case.