The ZoomViewer project on toollabs uses a custom .lighttpd-conf file that adds a target for a fcgi process:
https://tools.wmflabs.org/zoomviewer/iipsrv.fcgi?FIF=cache/779543aa14d92a2dff180a4cbc0eb2f6.tif&obj=IIP,1.0&obj=Max-size&obj=Tile-size&obj=Resolution-number
This seemed to have stipped working (whereas the regulat php components of teh zoomviewer still work).
As far as I can see, this is an application error:
tools.zoomviewer@tools-webgrid-lighttpd-1401:~$ curl "http://localhost:60146//zoomviewer/iipsrv.fcgi?FIF=cache/779543aa14d92a2dff180a4cbc0eb2f6.tif&obj=IIP,1.0&obj=Max-size&obj=Tile-size&obj=Resolution-number"
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>503 - Service Not Available</title>
</head>
<body>
<h1>503 - Service Not Available</h1>
</body>
</html>although the proxy does do a very good job at making that non-obvious...
tools.zoomviewer@tools-webgrid-lighttpd-1401:~$ ls -l /proc/5591/fd total 0 lrwx------ 1 tools.zoomviewer tools.zoomviewer 64 Oct 24 11:39 0 -> /dev/null lrwx------ 1 tools.zoomviewer tools.zoomviewer 64 Oct 24 11:39 1 -> /dev/null l-wx------ 1 tools.zoomviewer tools.zoomviewer 64 Oct 24 11:39 2 -> /data/project/zoomviewer/error.log (deleted) l-wx------ 1 tools.zoomviewer tools.zoomviewer 64 Oct 24 11:39 3 -> /data/project/zoomviewer/error.log (deleted) lrwx------ 1 tools.zoomviewer tools.zoomviewer 64 Oct 24 11:39 4 -> socket:[17054] l-wx------ 1 tools.zoomviewer tools.zoomviewer 64 Oct 24 11:39 5 -> /data/project/zoomviewer/access.log lrwx------ 1 tools.zoomviewer tools.zoomviewer 64 Oct 24 11:39 6 -> anon_inode:[eventpoll] lrwx------ 1 tools.zoomviewer tools.zoomviewer 64 Oct 24 11:39 7 -> socket:[17070]
so the error.log was probably deleted/truncated, or it's an effect of NFS issues we had a few weeks ago. Restarting the server should solve that issue.