code: @Override
      public boolean getPreserveFullyQualifiedReferrerUrl() {
          WebAppSecurityConfig globalConfig = WebAppSecurityCollaboratorImpl.getGlobalWebAppSecurityConfig();
          if (globalConfig != null)
              return WebAppSecurityCollaboratorImpl.getGlobalWebAppSecurityConfig().getPreserveFullyQualifiedReferrerUrl();
          else
              return preserveFullyQualifiedReferrerUrl;
      }
docs: {@inheritDoc}