Bug: If server url is in format host:port/path/ UI will perform redirects without path

[Lougarou]

Reproduction:

1. Start EventStore v5 server

2. Start Nginx with config below:
   server {
   listen 8080;
   server_name localhost;
   location /eventstore/ {
   proxy_pass http://127.0.0.1:2113/;
   }
   }

3. Access UI at localhost:8080/eventstore/

4. Login form will have login url as localhost:8080 instead of localhost:8080/eventstore/ <- bug 1

5. Change login to localhost:8080/eventstore/ and log in

6. Refresh page, redirect will be done to localhost:8080 which is resolved as not found, redirecting user back to login page <- bug 2

[jamiewinder]

I've just encountered this myself - is there a particular nginx config we should be using for this?