Merge pull request oauth2-proxy#269 from YenTheFirst/escape-k8s-auth-…

…signin

Escape original request URI in sample kubernetes ingress configuration

docs/configuration/configuration.md

@@ -310,7 +310,7 @@ If you use ingress-nginx in Kubernetes (which includes the Lua module), you also
 
 ```yaml
 nginx.ingress.kubernetes.io/auth-response-headers: Authorization
-nginx.ingress.kubernetes.io/auth-signin: https://$host/oauth2/start?rd=$request_uri
+nginx.ingress.kubernetes.io/auth-signin: https://$host/oauth2/start?rd=$escaped_request_uri
 nginx.ingress.kubernetes.io/auth-url: https://$host/oauth2/auth
 nginx.ingress.kubernetes.io/configuration-snippet: |
   auth_request_set $name_upstream_1 $upstream_cookie_name_1;