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 [email protected]. > To unsubscribe from this group, send email to > [email protected]. > 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/heroku?hl=en.
