I'm not saying it will work, but have you tried a relative URL (one that starts with the "f?p=...")?
I Try it....i will go back.
To Tony's answer in each environment try something like this :
Substitution String Substitution Value
So you can have https://ENV.intra.sepaq.com/apex/f?p=ReseauSepaq:101
Yes it works well ... Very happy.