fix(nginx): handle relative redirect (#14)

* fix(nginx): handle relative redirect

* anchor http instead of wildcard

Author: ChandonPierre

nginx.conf

@@ -296,7 +296,10 @@ echo "Docker configured with HTTPS_PROXY=$scheme://$http_host/"
             # the proxy_* directives, these will disappear
             set $original_uri $uri;
             set $orig_loc $upstream_http_location;
-
+            # Handle relative re-direct in Location header (as opposed to absolute)
+            if ($upstream_http_location !~ "^http") {
+                set $orig_loc "${scheme}://${host}${upstream_http_location}";
+            }
             # during this process, nginx will preserve the headers intended for the original destination.
             # in most cases thats okay, but for some (eg: google storage), passing an Authorization
             # header can cause problems. Also, that would leak the credentials for the registry