e07889d47e6f959eb8a7ea151ecf09ab6d9439d3
max
  Tue May 17 06:32:30 2022 -0700
adding invisible link so can find web crawlers, no redmine, making now so can analyze the data in a few months

diff --git src/hg/hgTracks/hgTracks.c src/hg/hgTracks/hgTracks.c
index c3eab37..0e0064b 100644
--- src/hg/hgTracks/hgTracks.c
+++ src/hg/hgTracks/hgTracks.c
@@ -9191,30 +9191,34 @@
 if (sameString(database, "wuhCor1"))
     {
     puts("<p class='centeredCol'>\n"
          "For information about this browser and related resources, see "
          "<a target='blank' href='../covid19.html'>COVID-19 Research at UCSC</a>.</p>");
     // GISAID wants this displayed on any page that shows any GISAID data
     puts("<p class='centeredCol'>\n"
          "GISAID data displayed in the Genome Browser are subject to GISAID's\n"
          "<a href='https://www.gisaid.org/registration/terms-of-use/' "
          "target=_blank>Terms and Conditions</a>.\n"
          "SARS-CoV-2 genome sequences and metadata are available for download from\n"
          "<a href='https://gisaid.org' target=_blank>GISAID</a> EpiCoV&trade;.\n"
          "</p>");
     }
 
+// add hidden link as a trap for web spiders, for log analysis one day to get an idea what the spider IPs 
+// are
+hPrintf("<a href='/notExist.html' style='display:none'>Invisible link</a>");
+
 hPrintf("</CENTER>\n");
 
 #ifdef SLOW
 /* We'll rely on the end of program to do the cleanup.
  * It turns out that the 'free' routine on Linux is
  * quite slow.  For chromosome level views the browser
  * spends about 1/3 of it's time doing the cleanup
  * below if it's enabled.  Since we really don't
  * need to reclaim this memory at this point I'm
  * taking this out.  Please don't delete the code though.
  * I'll like to keep it for testing now and then. -jk. */
 
 // TODO GALT cleanup sibs too? probably can do for window copies but low priority.
 /* Clean up. */
 for (track = trackList; track != NULL; track = track->next)