This is for Avalanche appliances and Spirent TestCenter L47 Modules.
Software version for 4.37 and below.
Now Avalanche does not support IPv6 address with port number in a get request, using variable and form database can be a workaround, here with the steps.
Step1. Create Form Database in Client/Actions/Forms with below format.
For example: [2105:0200:FF:FE00:8000]:81
Step2. Add action list in Client/Actions with below format.
Assign Variable <Host Form.$1>
1 get http://<APPLY Host>