docs: public void init() throws ServletException {
          FilterConfig config = getFilterConfig();
  
          // Default don't delete cache files on exit (persistent cache)
          boolean deleteCacheOnExit = "TRUE".equalsIgnoreCase(config.getInitParameter("deleteCacheOnExit"));
  
          // Default expiry time 10 minutes
          int expiryTime = 10 * 60 * 1000;
  
          String expiryTimeStr = config.getInitParameter("expiryTime");
          if (!StringUtil.isEmpty(expiryTimeStr)) {
              try {
                  // TODO: This is insane.. :-P Let the expiry time be in minutes or seconds..
                  expiryTime = Integer.parseInt(expiryTimeStr);
              }
              catch (NumberFormatException e) {
                  throw new ServletConfigException("Could not parse expiryTime: " + e.toString(), e);
              }
          }
  
          // Default max mem cache size 10 MB
          int memCacheSize = 10;
  
          String memCacheSizeStr = config.getInitParameter("memCacheSize");
          if (!StringUtil.isEmpty(memCacheSizeStr)) {
              try {
                  memCacheSize = Integer.parseInt(memCacheSizeStr);
              }
              catch (NumberFormatException e) {
                  throw new ServletConfigException("Could not parse memCacheSize: " + e.toString(), e);
              }
          }
  
          int maxCachedEntites = 10000;
  
          try {
              cache = new HTTPCache(
                      getTempFolder(),
                      expiryTime,
                      memCacheSize * 1024 * 1024,
                      maxCachedEntites,
                      deleteCacheOnExit,
                      new ServletContextLoggerAdapter(getFilterName(), getServletContext())
              ) {
                  @Override
                  protected File getRealFile(CacheRequest pRequest) {
                      String contextRelativeURI = ServletUtil.getContextRelativeURI(((ServletCacheRequest) pRequest).getRequest());
  
                      String path = getServletContext().getRealPath(contextRelativeURI);
  
                      if (path != null) {
                          return new File(path);
                      }
  
                      return null;
                  }
              };
              log("Created cache: " + cache);
          }
          catch (IllegalArgumentException e) {
              throw new ServletConfigException("Could not create cache: " + e.toString(), e);
          }
      }