More detailed information about executions, specially after an error

[kelps]

Failed executions provide very little information. The stack trace could be a LOT more usefull if it was accompanied by more details about the request.

Imagine I'm trying to do a request using variables for the url and some parameters, but the url is wrong in the variable or maybe I forgot to create the variable or created it with the wrong name. When the error occurs, being able to see the final content of the request would be really helpful in diagnosing what happened.