Add transport option (#605)
Add transport option (#605)

We used to have the transport option before:

https://github.com/knative/networking/blob/release-1.0/test/test_images/httpproxy/httpproxy.go#L107-L110

but it was dropped and it looks like it caused visibility test flake.

This patch tries to verify the fix.
knative/networking,knative/networking