[dancer-users] Dancer 1 FCGI deployment quandry

Joel Roth joelz at pobox.com
Tue Nov 14 21:17:49 GMT 2017

Hi List,

I have a web application at Dreamhost.com that I'm 
trying to convert to fastcgi. Under CGI, the application
runs via perlbrew using a self-compiled perl. 

In the Apache 2 error log, I'm getting 

	[Mon Nov 13 13:31:53 2017] [error] [client] Premature end of script headers: dispatch.fcgi

When I run the script dispatch.fcgi, it brings up the Dancer HTTP server:

	HTTP::Server::PSGI: Accepting connections at http://0:5000/

>From the Dreamhost docs[1,2] and using the supplied test
script, I don't need to modify the Apache configuration.
The only changes I made to the original dispatch.cgi --
gleaned from Dancer::Deployment -- were updating the script
name and mod_rewrite rule.

File listings that make up my deployment follow. I don't
grok is how running dispatch.fcgi, which ends in an 'exec',
relates to an existing, persistent Dancer process. Perhaps
Plack::Runner->run() should receive a coderef rather than a
filename? I tried, but received the same the error message.
I greatly welcome any suggestions!

1.  https://help.dreamhost.com/hc/en-us/articles/217298967-FastCGI-overview
2.  https://help.dreamhost.com/hc/en-us/articles/216512598-Perl-overview

cd dev.childspacemethod.com
ls -l
-rwxrwxr-x 1 childspace pg2527812  81 Nov 13 13:33 dispatch.fcgi
-rw-r--r-- 1 childspace pg2527812 157 Nov 13 12:40 .htaccess
-rwxrwxr-x 1 childspace pg2527812 155 Nov 13 12:47 plack_runner.pl

cat .htaccess

	# BEGIN dancer application htaccess
	RewriteEngine On
	RewriteCond %{REQUEST_FILENAME} !-f
	RewriteRule (.*) dispatch.fcgi/$1
	# END dancer application htaccess

cat dispatch.fcgi

	source ~/.bashrc
	perlbrew use 5.16.3
	exec `dirname $0`/plack_runner.pl

cat plack_runner.pl

    #!/usr/bin/env perl
	use Modern::Perl;
	use Plack::Runner;
	use autodie;
	chdir '/home/childspace/dev';

cat /home/childspace/dev/dance.psgi

	#!/usr/bin/env perl
	BEGIN { push @ARGV, qw(--environment=production) }
	use Modern::Perl;
	use Dancer;
	load_app 'Training::Resources';

Joel Roth

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