Nexus serves up remote directory listing through proxy repository

Create a maven 2 proxy repository with a remote of:  https://artifacts.alfresco.com/nexus/content/groups/public/

Download a file through the proxy:

http://localhost:8081/repository/alfresco/org/springframework/spring-context/1.2.1/spring-context-1.2.1.pom

Now supply a part of the path of that file without a trailing slash:

http://localhost:8081/repository/alfresco/org/springframework

Observe that an HTML directory is seen.  The remote URL's in the listing are all from the remote of the proxy:

https://artifacts.alfresco.com/nexus/content/groups/public/org/springframework/spring-context/