* Change Dex port in local-environment from 4190 to 5556
Port 4190 is blocked by standards-compliant browsers (e.g. Firefox), as per https://fetch.spec.whatwg.org/#port-blocking.
Port 5556 is used by Dex in its example config files: 745e1114f3/examples/config-dev.yaml (L50)
* Fix upstream in local-environment/oauth2-proxy.cfg
http://httpbin.localtest.me:8080 is only exposed to the host, not to httpbin Docker network.
Causes Bad Gateway before.
* Do not expose unauthenticated httpbin service in local-environment
This defeats the point of having oauth2-proxy.
It has already been misleading by causing the bug fixed in cafc6af48fc38f6fe4395fb0c7e2638bc84e6091.
It serves as a bad example: users might accidentally expose the service they're trying to protect in the first place.
* Remove unnecessary httpbin.localtest.me alias from local-environment
* The `X-Forwarded-Uri` was required to bypass authentication
- Fix the `skip_auth_routes` option not working in Nginx
* Add tests for allowed requests with proxied `X-Forwarded-Uri` header
* Avoid nginx startup failure: host not found in upstream "oauth2-proxy"
* The `--reverse-proxy` option is required for nginx
* Update the change logs
* Use the authOnlyPath constant
* Remove the unused header `X-Scheme`
