<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>
<p>The document has moved <a href="https://cactus.nci.nih.gov/chemical/structure/Barban/stdinchikey">here</a>.</p>
<hr>
<address>Apache/2.2.15 (CentOS) Server at cactus.nci.nih.gov Port 80</address>
</body></html>
Does the node require an update to the URLs it generates?
The cactus web service got upgraded and now requiores HTTPS
https://cactus.nci.nih.gov/
"Notice: The CACTUS web server has been migrated to a significantly reconfigured system on new hardware (with a new IPv4 address). The HTTPS protocol has been enabled for all services. HTTP has been permanently turned off on March 31st, 2016. If you encounter any bugs or behavior different from the old server, please let us know immediately."
"<!DOCTYPE HTML PUBLIC -//IETF//DTD HTML 2.0//EN>
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>
<p>The document has moved <a href=https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C15H10F6O2/c16-14(17,18)13(15(19,20)21,9-1-5-11(22)6-2-9)10-3-7-12(23)8-4-10/h1-8,22-23H/formula>here</a>.</p>
<hr>
<address>Apache/2.2.15 (CentOS) Server at cactus.nci.nih.gov Port 80</address>
</body></html>"