How to set system proxy inside Groovy script on OBM?

Hi!

While working with event forwarding rules I'm having big trouble using groovy scripts and proxy config at a client's server. If you access the desired URL through a web browser or postman it works fine (bc it's using system proxy), when the event forwarding script is executed it keeps giving a UnknownHostException. 

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We made tests in postman NOT using the system proxy and it doesn't connect I already tried setting the proxy on the script using http.proxyHost and http.proxyHost properties to no avail.

Is there a way to set the proxy settings inside the script or in OBM settings?

**I must say that this script and rule have been tested on a personal and internal laboratory with good results (without proxy settings)

Thanks beforehand!