I have been using the same XSLT files and proxy to an xml document for several generations without any problem. Recently (~1.11) I am getting an error when I do 'nginx -t':

/etc/nginx/xsl/so.xslt:1: parser error : Document is empty
error
xsltParseStylesheetFile : cannot parse /etc/nginx/xsl/so.xslt
nginx: [error] xsltParseStylesheetFile("/etc/nginx/xsl/so.xslt") failed in /etc/nginx/sites-enabled/miconcinemas.com:220
nginx: configuration file /etc/nginx/nginx.conf test failed

I have made no changes to the config or the xslt but have never seen this error before.

When I use xlstproc using the same stylesheet with the url to the xml file, the transform works as expected. I am uncertain why this behavior changed.

I am looking for suggestions on how I might diagnose this issue further.