Hi,
In the mobile world there is a lot of OS that called with local language and not only English.
If you go to IIS.net homepage and you will use Chrome to change your User Agent and you add Arabic chars you will see that you get an 502 error.
If you will try that in any website that don't use ARR you will not see this error.
ARR have a lot of problems with ASCII. Problems that other proxy don't have. I think it’s time to fix it.
Thanks.
Noam