Rails - Jun 2008 - Premature end of script headers; dispatch.cgi - ok

Hi,

I''m getting the dreaded "Premature end of script headers:
dispatch.cgi" message on my production server. Before I list all the
things that I tried, let me mention that I already have a Rails app
working on this server (installed by somebody else).

First app is accessible at: http://mydomain.com/cwps and it all works.
Second app is accessible at: http://mydomain.com/robo and the index
works, but http://mydomain.com/robo/controller/action bombs with
"Rails application failed to start properly".

1. Tried running dispatch.cgi from the command line, and I get a 404
page: Action Controller: Exception caught ... NOT a 500 error, meaning
that dispatch.cgi (and the ruby path) is working correctly.

2. The permissions on the dispatch files are ok:
-rwxrwxr-x  1 admin psacln 479 Jun 18 19:50 dispatch.cgi
-rwxrwxr-x  1 admin psacln 861 Jun 18 19:50 dispatch.fcgi
-rwxrwxr-x  1 admin psacln 479 Jun 18 19:50 dispatch.rb

3. The permissions on the symbolic link in the httpdocs directory to
the capistrano folder is also ok.

4. I''m using apache, pen and mongrel_cluster. Pen and mongrel_cluster
are running ok. The apache config I''m not too sure about:
<Directory /var/www/vhosts/mydomain/httpdocs/robo>
  Options +FollowSymLinks
  # Let apache correctly rewrite the redirect
  ProxyPassReverse http://localhost:8091/
  RewriteEngine On
  # If the cached page does not exist, send to mongrel
  # RewriteCond %{REQUEST_FILENAME} !-f
  RewriteRule ^(.*)$ http://localhost:8091/$1 [P,QSA,L]
</Directory>

I basically copied the cwps Directory node and I modified the pen port
number (to my second pen which is servicing robo).

What else can I check?

Thanks,
Tiberiu
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Hi

1) First of all give permission 775 for the whole application

2) see that the ownership of that file is proper

3) Open dispatch.cgi and check the path for ruby that might be wrong.

If all 3 things above is correct then i guess it should work..

Thanks

Dhaval Parikh
Software Engineer
www.railshouse.com
sales(AT)railshouse(DOT)com
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I don''t know what the hell happened to my reply. Anyway, I tried all
of these and still nothing.

Thanks,
Tiberiu
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Mr_Tibs wrote:
> I don''t know what the hell happened to my reply. Anyway, I tried
all
> of these and still nothing.
> 
> Thanks,
> Tiberiu
Hi

Do let me know wat error u get in script/console and apache log..Then I 
can do the needful.

thanks

Dhaval Parikh
Software Engineer
Ruby on Rails
http://www.railshouse.com
sales(AT)railshouse(DOT)com
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Hi,

I think I keep clicking "Reply to author". Anyway, here''s
what I said
in my message:

1. script/console does not display errors when started, but I don''t
really have any models to test it with
2. Application error Rails application failed to start properly -
printed when trying to access controller/action
3. in error_log:
[Fri Jun 20 11:00:48 2008] [error] [client XX.XXX.XX.XXX] Premature
end of script headers: dispatch.cgi
4. in access_log:
XX.XXX.XX.XXX - - [20/Jun/2008:11:00:48 -0700] "GET /robot/foo/blah
HTTP/1.1" 500 259 "-" "Mozilla/5.0 (X11; U; Linux i686;
en-US; rv:
1.8.1.6) Gecko/20071008 Ubuntu/7.10 (gutsy) Firefox/2.0.0.6"

Thanks,
Tiberiu
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I''m going CRAZY over this thing: I went back and I did a chmod 755 on
dispatch.cgi by mistake (not 775 as you specified). All of a sudden it
started working. I did a chmod 775 on dispatch.cgi and it stopped
working. I repeated this a few times and I thought it was all over -
the culprit being chmod 755. Then, I deployed a new release, and the
chmod trick stopped working. I kept rolling back and deploying new
releases a few times and the chmod sometimes does the trick, sometimes
it doesn''t!!! Why God? Why?

Anyway - on a different note, the application is started in
development mode, even though the mongrel cluster config file
specifies "release". Also, with the other application that is
successfully working, I don''t need to chmod anything and it starts in
production mode as expected.

Tiberiu
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AHAHAHAHA! THE RAGE!
There is a .htaccess HIDDEN file created in the public directory. That
file has to be removed. It cost me almost 8 hours of debugging!

Tiberiu
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