/* Compute a unique key for the cache entry based on query parameters */
  blob_init(&cacheKey, 0, 0);
  blob_appendf(&cacheKey, "/tarball/%z", rid_to_uuid(rid));
  if( zInclude ) blob_appendf(&cacheKey, ",in=%Q", zInclude);
  if( zExclude ) blob_appendf(&cacheKey, ",ex=%Q", zExclude);
  blob_appendf(&cacheKey, "/%q", zName);
  zKey = blob_str(&cacheKey);
    

  if( P("debug")!=0 ){
    style_header("Tarball Generator Debug Screen");
    @ zName = "%h(zName)"<br>
    @ rid = %d(rid)<br>
    @ zName = "%h(zName)"<br />
    @ rid = %d(rid)<br />
    if( zInclude ){
      @ zInclude = "%h(zInclude)"<br>
      @ zInclude = "%h(zInclude)"<br />
    }
    if( zExclude ){
      @ zExclude = "%h(zExclude)"<br>
      @ zExclude = "%h(zExclude)"<br />
    }
    @ zKey = "%h(zKey)"
    style_footer();
    return;
  }
  if( referred_from_login() ){
    style_header("Tarball Download");