0.50.0-rc1 on api v0 no longer returns location for authentication requests

[flands]

Describe the bug

In 0.40.1 if you connect to an auth service that returns a redirect via a location header then the browser receives the location header and redirects as expected. In 0.50.0-rc1 the location header is not sent -- instead a HREF response is sent.

To Reproduce

• On Ambassador 0.40.x, configure external authentication. Ensure the external authentication does a redirection based on the Location header.
• Upgrade to Ambassador 0.50.0-rc1
• Attempt to authenticate

Response to browser does not include a Location header. HREF is returned on the webpage.

Expected behavior

Ambassador returns Location header as this was the behavior in 0.40.x

Versions (please complete the following information):

• Ambassador: 0.50.0-rc1
• Kubernetes environment [e.g. Minikube, bare metal, Google Kubernetes Engine] kops
• Version [e.g. 1.8.1] 1.11.5

Additional context

[flands]

/cc @kflynn