I am trying to use Zuul to redirect calls to a downstream system somewhere else. In the re-direct, I need to add in a Header with necessary data for the
Zuul
I guess you use a Route Filter, maybe you can try with a Pre Filter.
Adding a custom header can be done with something like this : context.addZuulRequestHeader("Authorization", "Basic " + credentials);.
context.addZuulRequestHeader("Authorization", "Basic " + credentials);
For the redirection part, you can check this thread