FastCgiModule error 500 with Azure

I am trying to run a Perl Fast CGI process in Azure. I have built a hello world test page (test.pl) and if I run it from the command it works

d:\home\site\wwwroot\bin\perl\bin\perl.exe -MFCGI::IIS=do test.pl

I have a handler for *.pl to run d:\home\site\wwwroot\bin\perl\bin\perl.exe (Strawbery Perl) with the arguments -MFCGI::IIS=do (i.e. the same as the above).

I get a 500 error. When I view the detailed log the only information I get back is FastCgiModule Error Code 0x8007000d.

My file runs from the command line but it won't run within the web app. Why not?

The problem was simple. My perl hello world worked from the command line, but for a web page it obviously needs to set the content type. I was missing the first line!

print "Content-type: text/html", "\n\n";
print "Hello World.\n";