Can anybody help me with this?

I am working on a HTTP Get call and get the following error in the system error log:

Wrapped PKIX path building failed: unable to find valid certification path to requested target

Example of the code:

var url = '
var result = rbv_api.sendHttpGet(url);

I already checked this post but i cant get any further with this

Can anybody tell me what to do?

Thanks in advance.

Regards Jorrit