Rails - How to send an image from a controller
Wouldn't be better to use send_file instead?
send_file Rails.root.join("public", "file.gif"), type: "image/gif", disposition: "inline"
Is there a reason that you cannot save the file to public/_ctrack.gif, remove the route, and let the underlying web server serve the image?
If you need to process the image from disk, just use open on the local filename:
send_data open("#{Rails.root}/path/to/file.gif", "rb") { |f| f.read } .......The rb sets the file to open and binary modes.