"2", "UserAgent only",
    "1", "UserAgent and Javascript",
  };
  multiple_choice_attribute(
     "Enable hyperlinks base on User-Agent and/or Javascript",
     "auto-hyperlink", "autohyperlink", "1",
     count(azDefenseOpts)/2, azDefenseOpts);






  @ <p>Enable hyperlinks (the equivalent of the "h" permission) for all users,
  @ including user "nobody", as long as the User-Agent string in the
  @ HTTP header indicates that the request is coming from an actual human


  @ being.  If this setting is "UserAgent only" (2) then the
  @ UserAgent string is the only factor considered.  If the value of this
  @ setting is "UserAgent And Javascript" (1) then Javascript is added that
  @ runs after the page loads and fills in the href= values of &lt;a&gt;
  @ elements.  In either case, &lt;a&gt; tags are only generated if the
  @ UserAgent string indicates that the request is coming from a human and
  @ not a robot.
  @
  @ <p>This setting is designed to give easy access to humans while
  @ keeping out robots.
  @ You do not normally want a robot to walk your entire repository because
  @ if it does, your server will end up computing diffs and annotations for
  @ every historical version of every file and creating ZIPs and tarballs of
  @ every historical check-in, which can use a lot of CPU and bandwidth
  @ even for relatively small projects.</p>
  @
  @ <p>The "UserAgent and Javascript" value for this setting provides
  @ superior protection from robots.  However, that setting also prevents
  @ the visited/unvisited colors on hyperlinks from displaying correctly
  @ on Safari-derived browsers.  (Chrome and Firefox work fine.)  Since
  @ Safari is the underlying rendering engine on all iPhones and iPads,
  @ this means that hyperlink visited/unvisited colors will not operate
  @ on those platforms when "UserAgent and Javascript" is selected.</p>
  @
  @ <p>Additional parameters that control the behavior of Javascript:</p>
  @ <blockquote>
  entry_attribute("Delay in milliseconds before enabling hyperlinks", 5,
                  "auto-hyperlink-delay", "ah-delay", "50", 0);
  @ <br>
  onoff_attribute("Also require a mouse event before enabling hyperlinks",
                  "auto-hyperlink-mouseover", "ahmo", 0, 0);
  @ </blockquote>
  @ <p>For maximum robot defense, "Delay" should be at least 50 milliseconds
  @ and "require a mouse event" should be turned on.  These values only come
  @ into play when the main auto-hyperlink settings is 2 ("UserAgent and
  @ Javascript").</p>

  @
  @ <p>To see if Javascript-base hyperlink enabling mechanism is working,
  @ visit the <a href="%R/test-env">/test-env</a> page (from a separate
  @ web browser that is not logged in, even as "anonymous") and verify
  @ that the "g.jsHref" value is "1".</p>
  @ <p>(Properties: "auto-hyperlink", "auto-hyperlink-delay", and
  @ "auto-hyperlink-mouseover"")</p>
}

/*
** WEBPAGE: setup_robot
**
** Settings associated with defense against robots.  Requires setup privilege.
*/