code: @Nullable
    public static ISessionWebScope getSessionWebScopeOfSession (@Nullable final HttpSession aHttpSession)
    {
      return aHttpSession == null ? null : getSessionWebScopeOfID (aHttpSession.getId ());
    }
docs: Get the session web scope of the passed HTTP session.
  
  @param aHttpSession
  The HTTP session to get the scope from. May be <code>null</code>.
  @return <code>null</code> if either the HTTP session is <code>null</code>
  or if no such scope exists.