Some sites redirect back to the proxy

[jakenoble]

Some sites I have noticed redirect back to the proxy with a query parameter like so, for example if I am running the proxy here http://local.com/app_dev.php/proxy-url

Then the redirect s to

http://local.com/app_dev.php/proxy-url?q=%A1%D6%D5%D5%A9mcf%9D%93%9D%A3%D8%95%92%D9%DB%A8%A8%C6%A3%A6%94%93%D2%9D%60t%D7%A8%9D%A2%A1%D6%D5%D5%A9XgxUd%7CY%98z%D2%C7%C9%A4%A6%C2c%A6%DF%A3%D7%95%9E%A8%90%99%A0%D2%5E%94%A7%94

URL decoding that results in this garbage

���թmcf����ؕ��ۨ�ƣ���ҝ`tר�����թXgxUd|Y�z��ɤ��c�ߣו������^���

This only happens on certain sites and I cannot see why its happening nor find a pattern.

[Athlon1600]

To which sites does this happen to?

[jakenoble]

https://magora-systems.com/

It works via the Proxy App but not via the Bundle in a Symfony Project

[Athlon1600]

All parts of that site seem to work fine for me. Try it:
https://unblockvideos.com/