Re: What is rails3_disable_x_sendfile?
Hi Trevor,
Keenan is right in that Heroku doesn't support the X-sendfile method:
- http://devcenter.heroku.com/articles/rack-sendfile
The support team initially added this documentation last year after I
submitted an issue regarding problems I was having serving Sass-
generated files from `./tmp` using Rack::Static. The relevant part of
my Rails configuration looked like this:
Sass::Plugin.options[:template_location] = {
#{Rails.root}/app/stylesheets = #{Rails.root}/tmp/stylesheets
}
Rails.configuration.middleware.insert_after 'Sass::Plugin::Rack',
'Rack::Static', :urls = ['/stylesheets'], :root =
#{Rails.root}/tmp
This worked in a simple Rack app, but not in Rails--I kept getting a
503 error. A member of the Heroku support team suggested that I remove
Rack::Sendfile from my middleware stack, and that solved the issue.
Since Rack::Static delegates to Rack::File, Rack::Sendfile will add
the `X-Sendfile` header. And since Heroku doesn't support the use of
Rack::Sendfile, file downloads will fail.
When I first found about this, I just removed Rack::Sendfile from my
middleware stack, but it seems Heroku is now getting round this
automatically by configuring Rails to disable the `X-Sendfile` header.
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What is rails3_disable_x_sendfile?
I'm seeing the following when pushing to Heroku: Configure Rails 3 to disable x-sendfile Installing rails3_disable_x_sendfile... done What is this about? Is there a way I should configure my app to avoid seeing this message? -- You received this message because you are subscribed to the Google Groups Heroku group. To post to this group, send email to heroku@googlegroups.com. To unsubscribe from this group, send email to heroku+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/heroku?hl=en.
Re: What is rails3_disable_x_sendfile?
Hi Trevor, config/environments/production.rb line 12 # Specifies the header that your server uses for sending files # config.action_dispatch.x_sendfile_header = X-Sendfile # For nginx: # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # If you have no front-end server that supports something like X-Sendfile, # just comment this out and Rails will serve the files And while you are in there, you may want to tweak config.serve_static_assets = true Best of luck, Keenan On Mar 21, 2011, at 7:20 AM, Trevor Turk wrote: I'm seeing the following when pushing to Heroku: Configure Rails 3 to disable x-sendfile Installing rails3_disable_x_sendfile... done What is this about? Is there a way I should configure my app to avoid seeing this message? -- You received this message because you are subscribed to the Google Groups Heroku group. To post to this group, send email to heroku@googlegroups.com. To unsubscribe from this group, send email to heroku+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/heroku?hl=en. -- You received this message because you are subscribed to the Google Groups Heroku group. To post to this group, send email to heroku@googlegroups.com. To unsubscribe from this group, send email to heroku+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/heroku?hl=en.
Re: What is rails3_disable_x_sendfile?
I have: config.serve_static_assets = true ...but I don't have anything with: config.action_dispatch.x_sendfile_header ...at all. Perhaps you are doing something unnecessarily in my case? You can view my app teamlab yourself on Heroku if you like. I can file a support ticket if necessarily. Also, you didn't answer my first question: what is this about ? :) Thanks, - Trevor -- You received this message because you are subscribed to the Google Groups Heroku group. To post to this group, send email to heroku@googlegroups.com. To unsubscribe from this group, send email to heroku+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/heroku?hl=en.
Re: What is rails3_disable_x_sendfile?
Hello Trevor, Web servers (e.g.: Apache) is tuned for serving up static files. Ruby (e.g.: mongrel) is not as efficient at serving up static files. But sometimes, your ruby code generates a file that needs to be streamed. Or it uses logic to determine the name of an existing file that needs to be streamed. So there is a mechanism for ruby to set a header (X-sendfile), asking apache to stream the file for it. This is nice: a) A mongrel is not held up b) c code can stream a file better than ruby. c) web servers are often tuned to use OS level calls, zero copy streaming, and stuff. Have them maintain that configuration. I think lighttpd introduced the flag, but I digress. You run into a problem when the static file is not on the filesystem of the apache server. E.g.: Apache is on one server and a mongrel is running on a separate machine. So you need to tell rails to not use the handy X-sendfile header and stream the file through. How this affects Heroku? The web server is running on a different machine than the dynos. So X-sendfile doesn't work. So they modify your environments/production.rb to disable that feature. But this tweaking takes a few seconds during slug generation, and they are tweaking your configuration. So they give you a warning to let you know. At least, that is my take, Keenan On Mar 21, 2011, at 7:45 AM, Trevor Turk wrote: I have: config.serve_static_assets = true ...but I don't have anything with: config.action_dispatch.x_sendfile_header ...at all. Perhaps you are doing something unnecessarily in my case? You can view my app teamlab yourself on Heroku if you like. I can file a support ticket if necessarily. Also, you didn't answer my first question: what is this about ? :) Thanks, - Trevor -- You received this message because you are subscribed to the Google Groups Heroku group. To post to this group, send email to heroku@googlegroups.com. To unsubscribe from this group, send email to heroku+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/heroku?hl=en. -- You received this message because you are subscribed to the Google Groups Heroku group. To post to this group, send email to heroku@googlegroups.com. To unsubscribe from this group, send email to heroku+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/heroku?hl=en.
Re: What is rails3_disable_x_sendfile?
On Monday, March 21, 2011 12:06:35 PM UTC, Keenan wrote: So you need to tell rails to not use the handy X-sendfile header and stream the file through. How this affects Heroku? The web server is running on a different machine than the dynos. So X-sendfile doesn't work. So they modify your environments/production.rb to disable that feature. But this tweaking takes a few seconds during slug generation, and they are tweaking your configuration. So they give you a warning to let you know. Thanks for the explanation, Keenan. Sorry, I thought you worked for Heroku! :) I'll follow up with Heroku directly about it. - Trevor -- You received this message because you are subscribed to the Google Groups Heroku group. To post to this group, send email to heroku@googlegroups.com. To unsubscribe from this group, send email to heroku+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/heroku?hl=en.
