Why did a Polish customer get a 'requested URL rejected' error when they requested a chat?

Environment: 

PC Pod Sites - Chat

Issue:

One of our Polish customers received this error when they requested a chat:

"The requested URL was rejected. Please consult with your administrator.
Your support ID is: (string of numbers)"

Resolution:

This error occurs when the chat launch URL is appended with an email address which ends in ".pl". The URLs used by our product differentiate between parameters with a '/' which results in the URL appearing like a file path if a '.pl' email address is entered. This causes a conflict when security software interprets the URL appended with the Polish email address as a 'perl' type file. Due to security precautions, the '.pl' file extension has been blocked to prevent unauthorized execution of perl files via a URL address.

To avoid this error, change the order of the parameters in the chat link so that the email parameter is not last in the URL.

For example, change:

https://yoursitename.custhelp.com/app/chat/chat_landing/first_name/Bob/last_name/Consumer/email/emailaddress%40domain.pl

to:

https://yoursitename.custhelp.com/app/chat/chat_landing/email/emailaddress%40domain.pl/first_name/Bob/last_name/Consumer/