Metadata update via HTTP GET fails

Hi,

I’m trying to send metadata updates via a HTTP GET command, but it fails (Bad Request)
If I send the same command via a webbrowser, it works fine.

http://username:password@streaming.jouw90sradio.nl/admin/metadata?mode=updinfo&mount=/[mount]&song={{artist}} - {{title}}

What can be the cause of this problem?
I tried both HTTP as HTTPS

Wkr,

Jorre Vink