text: #ifndef HEADER_PSL_H
  #define HEADER_PSL_H
  /***************************************************************************
   *                                  _   _ ____  _
   *  Project                     ___| | | |  _ \| |
   *                             / __| | | | |_) | |
   *                            | (__| |_| |  _ <| |___
   *                             \___|\___/|_| \_\_____|
   *
   * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
   *
   * This software is licensed as described in the file COPYING, which
   * you should have received as part of this distribution. The terms
   * are also available at https://curl.se/docs/copyright.html.
   *
   * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   * copies of the Software, and permit persons to whom the Software is
   * furnished to do so, under the terms of the COPYING file.
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   * KIND, either express or implied.
   *
   ***************************************************************************/
  
  #ifdef USE_LIBPSL
  #include <libpsl.h>
  
  #define PSL_TTL (72 * 3600)     /* PSL time to live before a refresh. */
  
  struct PslCache {
    const psl_ctx_t *psl; /* The PSL. */
    time_t expires; /* Time this PSL life expires. */
    bool dynamic; /* PSL should be released when no longer needed. */
  };
  
  const psl_ctx_t *Curl_psl_use(struct Curl_easy *easy);
  void Curl_psl_release(struct Curl_easy *easy);
  void Curl_psl_destroy(struct PslCache *pslcache);
  
  #else
  
  #define Curl_psl_use(easy) NULL
  #define Curl_psl_release(easy)
  #define Curl_psl_destroy(pslcache)
  
  #endif /* USE_LIBPSL */
  #endif /* HEADER_PSL_H */
  