Sure, check out this sample project:
ExampleHTTPRequest.zip (10.5 KB)
It opens a webhook.site and then sends a request to its address. The request contains JSON body and a custom header:
I hope it gives you an idea. Check out our Forum for more examples 
sonaliaggarwal47
mahmoud.zaky
WhatIsRpa.com
jeevith
A_Learner
Anirudh_Tugawe