The URL content returned through Nintex Web Request is limited to 255 character.
Is there anyway to return more than 255 characters?
I am using Nintex 2013 enterprise edition. Using Web Request, calling a web service to get result using 'GET' method
It sounds like you hit the SharePoint URL limitation. Can you share your url call? You may have to change the url by having this on another site with lessor characters.